The Duhamel Alberta UFO Nests

Theoretical Alignment

Duhamel is a physical-trace case with no witness to any craft, which fundamentally shapes how this case file weighs its theoretical alignment: there is no testimony to evaluate for consistency or embellishment, only a set of measured ground marks and a government scientist's own inconclusive technical assessment. The Psycho-Social/Mundane reading draws real strength from the site's own documented compromise — the field was trampled by curious visitors before a rigorous inspection could occur, and at least some of the ring surfaces showed tire-tread-like impressions the investigating scientist could not fully rule out as a hoax mechanism. What keeps this case at Disputed rather than lower is that the same investigating scientist, working for Canada's own military research establishment with every institutional incentive to close the case as a mundane prank, could not do so: his own weight-load calculation, however imprecise, pointed toward a mass no known agricultural equipment could plausibly have produced.

Background

Duhamel is a small rural hamlet in Camrose County, central Alberta, in the agricultural heartland roughly seventy miles south of Edmonton. Founded in the late nineteenth century by French Catholic settlers and named for Father Joseph-Balthazard Doucet's own religious order, the community by 1967 remained a small, tightly-knit farming settlement of the kind where an unusual local discovery would spread by word of mouth among neighbors within hours, well before any formal report reached provincial or national media.

The summer of 1967 sits inside a documented Alberta UFO wave — a cluster of sighting reports across the province that preceded the Duhamel discovery and had already drawn some local press and amateur UFO-club attention before Schielke found anything unusual in his own field. This case file treats that regional context as relevant but not determinative: a wave of unrelated sighting reports elsewhere in the province does not, by itself, explain a physically measured set of ground marks on one specific farm, but it does mean Duhamel's eventual discovery occurred in a local environment already primed to interpret an unusual find in UFO terms, a factor this case file weighs when assessing how the story spread and escalated to national media as quickly as it did.

Edgar Schielke discovered the first ring on Saturday, August 5, 1967, after a night of heavy rain had left his pasture soft and saturated — conditions this case file notes as directly relevant to the marks' own preservation and visibility, since a heavy rain shortly before discovery would have both softened the ground enough to register a clear impression and washed away any looser surface evidence (footprints, tire tracks from before that specific night) that might otherwise have helped date or explain the marks. Schielke had not visited this particular section of his own land in some time before the discovery, meaning the marks could, by his own account, have formed at any point during the preceding weeks rather than necessarily on the night of the rain itself — a genuine dating uncertainty this case file discloses rather than assumes away.

The speed with which the story escalated from a single farmer's local curiosity to a matter drawing formal Department of National Defence attention is itself worth situating within Canada's own institutional posture toward UFO reports in this period. Unlike the United States, where Project Blue Book had, by 1967, already weathered the Robertson Panel's own recommendation toward public de-emphasis and was widely perceived, including by many of its own former staff, as institutionally reluctant to engage seriously with strong cases, Canada's own Department of National Defence in the mid-to-late 1960s maintained a more consistently open channel for civilian UFO reports, routing credible cases through regional military research facilities like DRES for genuine, if resource-limited, scientific evaluation rather than reflexive dismissal. That institutional difference matters directly to how this case file weighs the Duhamel investigation's own credibility: Jones's involvement was not a public-relations gesture but a routine, if unusually well-documented, exercise of an existing Canadian government process for evaluating exactly this category of report.

Complete Timeline

Date	Event
August 5, 1967	Farmer Edgar Schielke discovers the first ring-shaped mark in his pasture near Duhamel, Alberta, after a night of heavy rain.
August 5–6, 1967	Schielke and neighbors locate three further rings in the same general area, for a total of four measured marks; local press is notified.
Shortly after discovery	An Edmonton-based UFO club and, subsequently, national Canadian media pick up the story, drawing curious visitors to the site who trample portions of the field before a formal scientific inspection can be conducted.
August 11, 1967	G.H.S. Jones, a scientist at the Defence Research Establishment Suffield (DRES), is formally requested by A.P.R. Lambert, DRES Superintendent of Logistics, to conduct an on-site inspection of the marks.
August 1967	Jones inspects and measures the four rings, takes soil samples, and calculates the approximate weight required to produce the observed ground compression.
Late 1967	The Defence Research Establishment Suffield's findings are compiled into an official memorandum, Suffield Memorandum #49/67, and the case is discussed in the Department of National Defence's ongoing UFO case files.
November 1967	An internal DND status memo lists the Duhamel case among those classified "unsolved."
1968	Canadian UFO Report, Volume 1, No. 7, publishes a civilian researcher account of the case for the broader Canadian UFO research community.
Present	The original DRES inspection report survives and has been digitized and made publicly available by Library and Archives Canada as part of its "Canada's UFOs" declassified document collection.

The Rings Themselves

The four marks Schielke and his neighbors located varied modestly in size and shape: the smallest measured 31 feet 9 inches in diameter; three of the four were essentially circular, while the largest was slightly elliptical, ranging between 34 feet 5 inches and 36 feet 3 inches across. Each ring itself, the actual compressed or disturbed band of ground, measured only five to seven inches wide — a narrow, well-defined edge rather than a broad, diffuse area of general disturbance, a detail this case file finds relevant to any explanation requiring either a precisely engineered hoax mechanism or an object with an unusually well-defined physical footprint. Vegetation within the rings themselves had been removed or flattened; no scorch marks, burn residue, or evidence of exhaust or chemical contamination was found anywhere at the site, and the surrounding soil showed no disturbance beyond the rings' own narrow bands.

This case file discloses a genuine discrepancy in the secondary literature regarding the exact number of rings: while Wikipedia's own detailed, individually measured account describes four marks, at least one other secondary compilation of Canadian UFO cases references six or seven. This case file treats the four-ring account as the better-supported figure, since it is the version accompanied by individual measurements for each mark rather than a bare count, but discloses the discrepancy honestly rather than silently picking one figure without acknowledging the conflict in the available secondary sourcing.

The rings' own spatial arrangement relative to one another is a further detail this case file finds worth preserving, even where the surviving secondary record leaves it only partially described. At least one of the four marks sat on sloping rather than level ground, and at least one crossed an existing willow fence line on the property, per one secondary account of the site's layout — details that, if accurate, complicate a simple single-mechanism hoax explanation requiring uniform, level ground to execute consistently (a rope-and-stake or vehicle-towed device is considerably harder to operate with consistent precision across a slope or through an existing fence line than on flat, open pasture). This case file was unable to independently verify the sloping-ground and fence-crossing details against the primary DRES report itself, given the repeated access difficulties encountered in retrieving that document directly, and discloses that verification gap honestly rather than treating a secondary account's specific claim as independently confirmed primary fact.

The DRES Investigation

What elevates Duhamel above the large body of undocumented "crop circle" and ground-ring reports from the same general era is the specific, named, credentialed nature of its investigation. G.H.S. Jones, a scientist at the Defence Research Establishment Suffield — Canada's premier military science and technology research facility, based near Ralston, Alberta, and specializing in exactly the kind of applied physical and engineering analysis this case required — was formally tasked with the inspection by A.P.R. Lambert, DRES's own Superintendent of Logistics, on August 11, 1967, six days after the marks were first found. That six-day gap, and the field's own documented trampling by curious visitors and press in the interim, represents this case's single most significant evidentiary limitation: whatever fine-grained physical detail the rings might have originally preserved had already been partially compromised before any trained investigator arrived.

Defence Research Establishment Suffield's own institutional history adds useful context for understanding why a facility of its kind would be tasked with a civilian UFO report at all. Established during the Second World War primarily for chemical and biological weapons testing on the vast, sparsely populated Suffield military reserve, DRES had, by the 1960s, broadened into a general-purpose applied physical sciences research facility serving the Canadian Forces' wider technical needs, giving it both the specific engineering expertise (soil mechanics, load analysis, materials testing) and the institutional mandate to take on an unusual civilian request of exactly this kind when tasked to do so by the Department of National Defence's broader UFO-report handling process. This case file finds that institutional fit genuinely significant: Duhamel was not investigated by a generalist with no relevant background improvising an assessment, but by a facility whose ordinary peacetime work already involved precisely the category of physical measurement the case required.

Jones's own on-site findings, as recorded in the surviving inspection report, were genuinely mixed rather than confidently pointing toward either a hoax or an anomaly. He noted that portions of at least some of the rings displayed marks consistent with a narrow, tire-like tread, a detail that would support a mundane, mechanically produced explanation if it could be shown to run consistently around each ring's full circumference — but the tread-like marks appeared only on limited portions of the rings rather than continuously, leaving Jones unable to conclude confidently that the entire formation was produced by any single wheeled or tracked mechanism. Soil sample testing conducted as part of the investigation proved inconclusive, identifying no unusual chemical residue, radiation, or contamination, but also providing no positive evidence pointing toward a specific cause.

The Weight Calculation

The investigation's single most striking finding, and the one this case file weighs most heavily, is Jones's own weight-load estimate. Based on the depth and character of the ground compression within the narrow ring bands, relative to the field's known soil composition and moisture content at the time, Jones calculated that whatever produced the marks would have needed to exert a "tremendous weight" — his own report specifies a load at least three times that of a standard truck tire, and secondary accounts of the report's conclusions describe an implied total weight in the range of 135 tons, a figure Jones's own report characterizes as consistent with "a large aircraft or, presumably, small spacecraft." This case file treats that specific figure carefully: it represents a trained investigator's genuine engineering estimate based on physical measurement, not a casual guess, but it is also an estimate this case file was unable to verify against the report's own full underlying calculation, since the complete original document could not be directly retrieved during this case file's own research despite repeated attempts.

The underlying physics of Jones's own approach is worth situating for readers unfamiliar with soil-mechanics load estimation. A given weight distributed across a given contact area produces a predictable, calculable depth of compression in soil of known composition and moisture content — the same basic engineering principle used to calculate tire pressures, foundation loads, and vehicle ground pressure ratings more generally. Working backward from an observed compression depth to an implied total weight requires knowing, or reasonably estimating, both the soil's own load-bearing characteristics at the time of measurement and the total contact area over which that weight was distributed — in this case, the narrow five-to-seven-inch band comprising each ring's own circumference. This case file notes that the narrower the actual contact band, the less total weight would be required to produce a given compression depth, meaning Jones's own 135-ton implied figure depends significantly on his own assumptions about exactly how the load was distributed across each ring — assumptions this case file was unable to verify in full technical detail against the complete original report.

This case file also weighs what the weight calculation does not, by itself, establish. A concentrated 135-ton load distributed across four separate narrow rings is a very different physical scenario from a single 135-ton object resting on the ground as a whole — the actual reported evidence describes compression only within the narrow ring bands themselves, not across the full interior area each ring enclosed, meaning whatever produced the marks left no corresponding compression signature across the roughly 800-to-1,000-square-foot area each ring's interior represents. That detail is significant for evaluating what kind of object the marks might represent: a genuinely solid 135-ton disc or craft resting flat on the ground would be expected to compress the ground across its entire footprint, not merely along a narrow ring at its outer edge, unless the object's own weight was specifically concentrated along a ring-shaped support structure at its perimeter — a detail this case file finds genuinely puzzling rather than straightforwardly explanatory of either a conventional or an anomalous cause.

Key Witnesses

The Five Observables Assessment

The Five Observables framework, built around reported flight and propulsion behavior, has limited application to a case with no witnessed craft or flight behavior of any kind — only a static ground trace inspected after the fact.

Assessment: This case's evidentiary weight rests entirely on physical ground-trace analysis, not on any observed craft behavior. Its closest evidentiary comparison within this catalogue is to other landing-trace cases, such as the Tully Saucer Nests and the Langenburg UFO/Saucer Nests, rather than to any radar-visual or close-encounter case with an actual witnessed object.

Evidence Assessment

Weighing Duhamel requires holding two genuinely competing readings of the same single document in view simultaneously: Jones's own report contains real evidence pointing in both directions, and this case file's assessment reflects that internal tension rather than resolving it artificially toward either a confident vindication or a confident dismissal.

Why "Disputed"

This case earns a Disputed rating on the strength of its formal government investigation and its investigator's own genuinely inconclusive, rather than dismissive, findings — a scientist working for Canada's own military research establishment, with every institutional and reputational incentive to close the case as an obvious hoax if the evidence had supported that conclusion cleanly, instead filed a report describing partial evidence for both a mechanical explanation and a mass inconsistent with any known conventional cause. It falls short of Credible because the six-day gap between discovery and formal inspection, combined with the field's own documented trampling and the ambiguous tire-tread evidence, leaves real, unresolved doubt about the site's evidentiary integrity by the time Jones actually examined it.

This case file also weighs the genuine rarity, within its own broader catalogue, of a case where a government investigator's own report contains this specific combination of features: a positive, quantified physical measurement (the weight-load calculation) that points away from a mundane explanation, sitting directly alongside an investigator-flagged piece of evidence (the tire-tread marks) that points toward one, within the same single official document. Many disputed cases in this catalogue involve a straightforward disagreement between independent parties — a witness account versus a skeptic's later reinterpretation, or a government report versus an independent researcher's critique. Duhamel is comparatively unusual in that the internal tension sits within one investigator's own single, contemporaneous report, which this case file finds genuinely strengthens confidence that the tension reflects the actual physical ambiguity of the site itself, rather than a later, retrospectively imposed disagreement between parties working from different information or different institutional incentives.

Sensor & Instrumentation Detection Profile

No radar, photographic, or other instrumented detection of any craft exists for this case; the entire evidentiary record is post-hoc physical measurement and soil sampling conducted by Jones after the marks were discovered. This case file notes that the absence of any real-time instrumentation is an inherent structural limitation of a physical-trace case rather than an investigative failure specific to this one: a static ground mark discovered after the fact offers no opportunity for real-time sensor correlation of the kind this catalogue's radar-visual case files rely on. What Jones's inspection did provide was a genuine engineering-style physical measurement — ring dimensions, ground compression depth, and an inferred weight-load calculation — a different but not inherently weaker category of physical evidence than a radar return, though one this case file notes lacks the independent cross-verification a second radar system or a second visual witness would provide.

DRES's own institutional equipment and expertise in 1967 is relevant context for evaluating what level of technical rigor Jones's inspection likely brought to bear. As a facility whose core mission involved testing military ordnance, vehicles, and equipment under controlled field conditions, DRES maintained genuine in-house capability in exactly the kind of soil-mechanics and load-bearing analysis Jones's weight calculation depended on — this was not a scientist working outside his own area of applied expertise, but one applying a category of engineering analysis directly relevant to his facility's ordinary work, to an unusual civilian request. This case file weighs that institutional fit favorably: Jones was not merely a generalist scientist asked to speculate about an unfamiliar phenomenon, but a specialist applying a specific, relevant analytical toolkit to a genuinely novel application of it.

Environmental & Geospatial Context

The preceding night's heavy rain is central to this case's own evidentiary profile in ways that cut in multiple directions at once. Saturated ground registers compression marks more readily and in finer detail than dry, hard-packed soil, which this case file reads as a point in favor of the marks' basic authenticity as a real physical event rather than an old, gradually accumulated feature suddenly noticed — a genuinely fresh, sharp-edged impression on freshly softened ground is more consistent with a recent, discrete event than gradual wear. At the same time, saturated ground is also more easily marked by ordinary heavy equipment, including farm machinery, than firmer soil would be, meaning the same rain that helped preserve a sharp, detailed impression also lowered the practical bar for what kind of conventional equipment could have produced a visible mark at all — a tension this case file discloses rather than resolves in either direction.

Central Alberta's own agricultural geography in August 1967 is relevant background this case file weighs alongside the immediate weather conditions. Camrose County sits within Alberta's parkland belt, a transitional zone between the drier southern prairie and the boreal forest to the north, characterized by rolling terrain, mixed grain and cattle farming, and a growing season that puts early August squarely within the region's peak summer pasture and hay-cutting period — meaning Schielke's own pasture would have been under active seasonal use and regular, if not necessarily daily, observation by the landowner and his own farm operations, a detail relevant to how plausible it is that a set of four substantial ground marks could have gone unnoticed for an extended period before discovery. This case file finds that regional agricultural context modestly favors a relatively recent formation date close to the actual discovery, since a working pasture in its peak-use season is less likely to go unvisited for many weeks at a stretch than land in a genuinely fallow or seasonal off-period.

Observer Credibility & Occupational Profile

This case's evidentiary weight rests almost entirely on two individuals: Edgar Schielke, a working farmer with direct, practical knowledge of his own land and equipment and no evident motive to fabricate a story that would bring unwanted press attention and trespassing visitors to his own property, and G.H.S. Jones, a credentialed scientist at Canada's premier military research establishment, professionally accountable to his own superiors for the accuracy and rigor of his findings. This case file weighs Jones's own institutional position as particularly significant: DRES existed to provide the Canadian military with rigorous, defensible technical analysis, not to generate sensational UFO findings, and Jones's own genuinely mixed, hedged conclusions — neither confidently endorsing a hoax explanation nor confidently endorsing an anomalous one — read as consistent with an investigator reporting what his own physical measurements actually supported, rather than reaching for whichever conclusion might have been institutionally more convenient.

Schielke's own reported skepticism deserves particular weight in this case file's assessment, for reasons distinct from the simple observation that skeptical witnesses are generally more credible than credulous ones. A landowner whose own property becomes the center of a UFO media story faces genuinely mixed incentives: public attention could conceivably benefit a landowner seeking notoriety or tourism revenue, but for a working farmer in 1967 rural Alberta, the far more probable practical consequence was the one Duhamel's own history bears out — trespassing visitors trampling his pasture, unwanted press inquiries disrupting his working schedule, and a permanent public association between his own name and an inherently unresolved, faintly embarrassing mystery. Schielke's reported insistence that his own equipment could not have made the marks, made against those practical incentives rather than in service of them, is the kind of witness statement this case file's own broader methodology treats as carrying more weight than testimony that would predictably benefit the person giving it.

This case file also notes what the record does not include: no independent, second scientific opinion from any body outside DRES, no follow-up visit by Jones or any other investigator once initial press and public attention subsided, and no indication that the Royal Canadian Mounted Police, who handled some other 1967-era Canadian UFO reports in a law-enforcement capacity, were formally involved in this specific case. That absence of a second independent review is a genuine limitation on how confidently this case file can weigh Jones's own findings against any hypothetical alternative expert assessment that was never actually conducted.

Physical & Material Assays

The four measured ground rings are this case's central physical evidence, and this case file treats their specific, narrow, well-defined five-to-seven-inch band width as a genuinely distinctive feature relative to many other reported "saucer nest" and crop-circle cases from the same general era, several of which describe broader, less precisely delineated areas of disturbance. Soil sample testing, conducted as part of Jones's own investigation, found no unusual chemical residue, radiation signature, or contamination of any kind — a result this case file states plainly as inconclusive rather than as either confirming or ruling out an anomalous origin, since an object producing purely mechanical ground compression, whatever its ultimate nature, would not necessarily be expected to leave any chemical trace at all.

This case file also notes what soil testing in 1967 was, and was not, technically capable of detecting. Period soil analysis could reliably identify gross chemical contamination, unusual radioactivity above ambient background levels, and visible physical residue, but lacked the trace-level chemical and isotopic analysis techniques that later became standard in more rigorous physical-trace UFO investigations from the 1970s onward, including some of the soil and vegetation analysis later applied to other landing-trace cases this catalogue documents. A clean 1967-era soil test result is accordingly weaker negative evidence against an anomalous origin than an equivalently clean result from a more technically sophisticated later investigation would be — a limitation of the available 1967 testing technology this case file discloses rather than treats as fully settling the material-evidence question either way.

Historical Precedents & Archive Matches

Duhamel belongs to a small, internationally recognized cluster of mid-to-late-1960s "saucer nest" ground-trace cases this catalogue has separately documented in its own Tully Saucer Nests case file (Queensland, Australia, January 1966) and its Langenburg UFO/Saucer Nests case file (Saskatchewan, Canada, September 1974) — the latter sharing not only a broadly similar physical-trace profile but the same country and a broadly comparable prairie agricultural setting, seven years and one province apart. This case file finds the Langenburg comparison particularly instructive: both Canadian cases involved a working farmer's discovery of ring-shaped ground marks with no witnessed craft, both drew formal government or law-enforcement investigation, and both ultimately resisted a fully confident conventional explanation despite genuine, good-faith official efforts to find one. That two broadly similar cases occurred within the same country's agricultural heartland within a single decade is, on this case file's own reading, either evidence of a genuine recurring phenomenon with a shared underlying cause, or evidence that the same general category of hoax or misidentification recurs independently wherever the right combination of rural setting, soft ground, and media appetite for a saucer story exists — a question this catalogue's own case files do not claim to resolve definitively for either Duhamel or Langenburg individually.

Duhamel also occurred within a matter of weeks of this catalogue's own Falcon Lake Incident, the close-encounter case involving prospector Stefan Michalak in northwestern Ontario on May 20, 1967, and within the same broader 1967 period as the well-known Shag Harbour incident off Nova Scotia that October — making 1967 a genuinely dense year for high-profile Canadian UFO cases spanning physical-trace, close-encounter, and crash/splashdown categories within a single twelve-month span, all drawing some form of official Canadian government attention. This case file finds that density itself worth noting as context: 1967 was Canada's centennial year, a period of unusually intense national media attention and civic activity across the country, which this case file treats as plausibly relevant to why several genuinely independent cases from unconnected regions of Canada each received a comparatively high level of press coverage and, in Duhamel's and Falcon Lake's cases, formal government investigation, relative to how a broadly similar case might have been handled in a quieter news year.

The broader international "saucer nest" phenomenon of the 1960s and 1970s, which Tully, Langenburg, and Duhamel all belong to, would later become entangled, in the public imagination and in some skeptical literature, with the far more extensively documented English "crop circle" phenomenon that emerged in the 1970s and expanded dramatically through the 1980s and 1990s — a later phenomenon this catalogue's own research treats as a substantially different evidentiary category, since a large proportion of English crop circles from the 1990s onward were eventually traced to confirmed human hoaxers (most famously Doug Bower and Dave Chorley) using simple plank-and-rope flattening techniques. This case file notes that later confirmed hoax history as directly relevant background for evaluating the conventional-explanation candidates below, while also noting that Duhamel predates the well-documented English hoaxing wave by several years and involved measurements and a weight-load calculation the simple plank-and-rope method later confirmed for most English crop circles would not straightforwardly explain.

Material Analysis

This case's material record consists of the four measured ground rings themselves (long since regrown over and no longer physically present at the original site), the soil samples Jones collected and tested at the time (whose current disposition this case file could not determine), and the surviving written inspection report and Suffield Memorandum documenting the investigation's methodology and findings. This case file notes the absence of any confirmed surviving photograph from the original investigation as a genuine gap: period inspection reports of this kind commonly included photographic documentation, and if such photographs survive in Library and Archives Canada's broader holdings, they were not independently located and verified during this case file's own research.

The survival of the written inspection report itself, now digitized and publicly hosted by Library and Archives Canada as part of a broader declassified UFO document collection, represents a genuine institutional commitment to preserving this category of record that this case file credits directly. Canada's approach to declassifying and publicly cataloguing its own government UFO files, through Library and Archives Canada's dedicated "Canada's UFOs: The Search for the Unknown" collection, stands in useful contrast to the more piecemeal, request-driven declassification process that has characterized much of the equivalent American record — a difference this case file attributes to Canada's own distinct archival and freedom-of-information practices rather than to any greater or lesser seriousness with which the two countries' militaries originally treated the underlying reports.

The Conventional Explanation Candidate: An Agricultural or Improvised Hoax Mechanism

The most commonly proposed conventional explanation for Duhamel-type ground rings is a deliberately or accidentally produced mechanical mark — farm equipment operated in a circular pattern, an improvised prank using a weighted rope or chain pivoted around a central stake, or livestock repeatedly circling a feed or water source over time. This case file finds each of these candidates individually plausible in general terms but specifically weakened by details in Jones's own report: the landowner's direct denial that his own equipment could have produced the marks, the narrow and precisely uniform five-to-seven-inch band width across all four rings (harder to produce consistently with an improvised rope-and-stake method than with purpose-built machinery), and Jones's own weight-load estimate, which a simple rope-and-stake or livestock-circling mechanism would not be expected to produce at all, since neither exerts anything close to the calculated load.

Livestock Trampling

Cattle and other livestock repeatedly circling a fixed point (a feed trough, a salt lick, a stake) over an extended period can produce a genuine, naturally occurring ring-shaped trampled area in a pasture, a phenomenon well documented independent of any UFO context. This case file finds this candidate weakened specifically by the marks' own narrow, sharply defined band width and the absence of any reported feed source, salt lick, or other attractant at the center of any of the four rings in the surviving description of the site.

Deliberate Hoax

A deliberate hoax, whether by a prankster unconnected to the farm or, far less plausibly given his own denial and the story's unwanted attention for him personally, by Schielke himself, remains a candidate this case file cannot rule out given the tire-tread-like evidence Jones himself noted. It is weakened by the same specific engineering difficulty a livestock explanation faces: producing four separate rings of the observed precision and Jones's own calculated load-bearing characteristic using ordinary, readily available farm tools would represent a considerably more sophisticated and labor-intensive prank than the great majority of documented crop-circle hoaxes from this general era, most of which used considerably simpler methods (a plank and rope, or a garden roller) that would not plausibly generate the load Jones's own report describes.

Heavy Agricultural Equipment

A third candidate this case file considers directly is the use of genuine heavy farm or construction equipment — a tractor, a grain truck, or similar machinery — deliberately driven in tight circular patterns to produce the rings, whether as an elaborate prank by someone with access to such equipment or through some more mundane, non-prank operational purpose this case file was unable to identify from any source consulted. This explanation has the advantage of directly accounting for both the tire-tread-like marks Jones observed and a weight load considerably closer to what his own calculation implied than any lighter mechanism could produce. It is weakened by Schielke's own denial that his equipment could have produced the marks, by the difficulty of explaining why such equipment would have been driven in four separate, precisely dimensioned circular patterns rather than any more operationally sensible pattern, and by the absence of any reported tire tracks connecting the rings to the farm's own access roads or equipment storage areas — a detail this case file notes as a genuine gap in the surviving investigative record rather than as either confirming or ruling out this candidate.

Agricultural or Improvised Hoax Mechanism — Plausibility Rating: INCONCLUSIVE

Related Cases

Further Reading — Recommended Literature

Sources

• "Onsite Inspection of Reputed UFO Landing Marks at Duhamel," Defence Research Establishment Suffield, Library and Archives Canada. bac-lac.gc.ca
• "Canada's UFOs: The Search for the Unknown," Library and Archives Canada (declassified document database). collectionscanada.gc.ca/databases/ufo
• "Duhamel, Alberta," Wikipedia. en.wikipedia.org/wiki/Duhamel,_Alberta
• "UFO Sightings in Canada," Wikipedia. en.wikipedia.org/wiki/UFO_sightings_in_Canada
• "UFOs in Canada," The Canadian Encyclopedia. thecanadianencyclopedia.ca
• "Significant Canadian UFO Cases in 1967," Ufology Research. uforum.blogspot.com
• "North America 1967 Camrose," Old Crop Circles. oldcropcircles.weebly.com
• "Crop Circle," International Flying Saucer Bureau (IFSB). internationalflyingsaucerbureau.com
• "What UFO Fears Tell Us About Trust in Government," The Walrus. thewalrus.ca
• "Learn Duhamel, Alberta Facts for Kids," Kiddle. kids.kiddle.co
• "Defence Research Establishment Suffield," Wikipedia. en.wikipedia.org/wiki/Defence_Research_Establishment_Suffield
• Chris A. Rutkowski, Canada's UFOs: Declassified, Dundurn Press.
• Chris A. Rutkowski, A World of UFOs, Dundurn Press, 2008.
• Jacques Vallée, Passport to Magonia: From Folklore to Flying Saucers, Henry Regnery Company, 1969.
• Jerome Clark, The UFO Encyclopedia, 3rd ed., Visible Ink Press.

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