UNRESOLVED
CF-GEI-19880402015 UNRESOLVED
The Jouars-Pontchartrain Ground Trace
CASE FILE — CF-GEI-19880402015 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1988-06-01
Location Reported location of the sighting or event
Jouars-Pontchartrain, Yvelines, France
Duration Estimated duration of the observed phenomenon
Unknown - trace persisted for several months
Object Type Classification of the observed object based on witness descriptions
unknown
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
3
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
In the spring or summer of 1988-1990 (exact date unknown), three individuals arrived at their property in Jouars-Pontchartrain, Yvelines, France, and discovered an unusual circular trace in the grass along a hedge line. The trace formed a perfect circle approximately 2 meters in outer diameter, with the affected band measuring roughly 20 centimeters in width. The grass within this circular band appeared flattened or crushed. Over the following months, the affected area exhibited differential growth patterns compared to the surrounding lawn, keeping the circular pattern visible for an extended period.
The case was reported to GEIPAN in 2008, nearly two decades after the original discovery. Only one witness provided testimony, though three people initially observed the trace. The witness could not recall the exact date of discovery, placing it somewhere between spring 1988 and summer 1990. The arbitrary date of April 1, 1988, was assigned for record-keeping purposes. No aerial phenomenon was observed in connection with the ground trace—the witnesses simply discovered the marking upon arrival at their property.
GEIPAN classified this case as "C" (insufficient information), noting that the testimony describes only physical evidence on the ground with no associated observation of an aerospace phenomenon. Without any connection to a witnessed aerial object or event, investigators deemed the case non-exploitable for UAP analysis. The case represents a ground trace anomaly without accompanying sighting data, leaving the origin of the circular pattern entirely unexplained.
02 Timeline of Events
Spring/Summer 1988-1990
Discovery of Ground Trace
Three people arriving at their property in Jouars-Pontchartrain discover a circular trace in the grass along a hedge line. The circle measures approximately 2 meters in outer diameter with a 20cm-wide band of flattened grass.
Following months (1988-1990)
Persistent Differential Growth
The affected circular area exhibits different growth patterns compared to surrounding grass, keeping the trace visible for several months.
2008
Delayed Report to GEIPAN
Approximately 18-20 years after the event, one witness reports the incident to GEIPAN. The witness cannot recall the exact date, only that it occurred during spring or summer between 1988-1990.
2008
GEIPAN Investigation
GEIPAN reviews the single witness testimony but determines the case is non-exploitable as it describes only a ground trace with no associated aerospace phenomenon observed.
2008
Classification: C - Insufficient Information
GEIPAN officially classifies the case as 'C' due to lack of information and absence of any witnessed aerial phenomenon that could be linked to the ground trace.
03 Key Witnesses
Anonymous Witness 1
Property owner/resident
low
One of three people who discovered the ground trace in 1988-1990. Reported the incident to GEIPAN in 2008, approximately 18-20 years after the event. Unable to recall specific date or year with certainty.
"The witness could not remember the exact date (spring or summer 1988-1990)."
Anonymous Witness 2
Present at discovery
unknown
One of two additional people present when the circular ground trace was discovered. Did not provide testimony to GEIPAN.
Anonymous Witness 3
Present at discovery
unknown
One of two additional people present when the circular ground trace was discovered. Did not provide testimony to GEIPAN.
04 Analyst Notes -- AI Processed
This case presents significant analytical challenges due to its fundamental limitations. First, the 18-20 year delay between the incident and formal reporting introduces substantial memory degradation—the witness cannot even narrow down the year with certainty. Second, and more critically, there is no observed aerial phenomenon to investigate. The witnesses discovered an already-formed ground trace without witnessing any object, light, or event that might have created it. This removes the core element that would classify it as a UAP case.
The physical evidence itself is intriguing but ambiguous. A 2-meter diameter circle with 20cm-wide crushed grass that persisted for months through differential growth suggests some form of pressure or environmental impact. However, numerous mundane explanations exist: circular livestock tethering, children's games with stakes and ropes, fungal rings affecting grass growth, deliberate hoaxing, or even forgotten landscaping equipment placement. The location along a hedge line is noteworthy—hedges are common boundaries where circular patterns might result from maintenance activities or tethered animals. The fact that only one of three witnesses provided testimony two decades later raises questions about the consistency and reliability of the memory.
05 Theory Comparison
BELIEVER ANALYSIS
Unwitnessed Landing or Hovering Event
While no aerial object was observed, proponents might suggest the ground trace resulted from an unwitnessed landing or low-hovering craft that affected the grass through pressure, heat, electromagnetic fields, or unknown energy emission. The circular pattern and differential growth could theoretically indicate exposure to unusual forces. However, this theory is purely speculative given the complete absence of any observed aerial phenomenon, witness accounts of unusual events, or any other corroborating evidence.
SKEPTIC ANALYSIS
Mundane Agricultural/Landscaping Activity
The circular pattern most likely resulted from ordinary ground-level activity such as a tethered animal grazing in a circle, children playing with a stake and rope, placement of a circular object (water tank, pool, equipment) that was later removed, or even a circular planter or landscaping feature. The 2-meter diameter and 20cm width are consistent with many ordinary circular implements or tethering systems. The location along a hedge suggests boundary-related activities.
06 Verdict
ANALYST VERDICT
This case likely represents a mundane ground disturbance pattern misremembered or misinterpreted after nearly two decades. GEIPAN's classification as "C - insufficient information" is entirely appropriate. Without any witnessed aerial phenomenon, temporal context, photographs, soil analysis, or even consistent witness accounts, there is no basis for investigating this as a UAP-related event. The circular ground trace could have numerous prosaic explanations, from agricultural/gardening activities to natural phenomena like fairy rings (fungal growth patterns). The most significant factor is the complete absence of any observed aerial object or event—this is simply a ground anomaly discovered after the fact. While unexplained, it falls outside the scope of aerospace phenomena investigation and merits low priority for CASEFILES inclusion except as an example of insufficient evidence cases.
AI CONFIDENCE SCORE:
85%
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