Charles River
US19910133_AJanuary 1991·Charles River·ice
Reported January 1991 in ice at Charles River. One archive recorded it, so nothing about it can be cross-checked.
The record
- date
- January 1991 (month precision)
- place
- Charles River
United States - crop
- ice
- size
- not recorded
- recorded by
- cc
- images
- 1 · 1 diagram
- writing
- nothing was written about this formation on any source
Also called
Nothing else. No other name or place string appears on any source record for this formation.
Where exactly
- coordinate
- 42.370930, -71.049500
- how it was got
- geonames
place, to within 2,000 m, from the cc record - on a map
- OpenStreetMap
No source publishes a coordinate for any formation in this archive. Every coordinate here is derived from the place name a source printed, and this page says how precise that makes it rather than rounding it away.
Images
1 image(s) on this formation's own source records. Click a tile for the full image; the bytes are fetched when you ask for them and are not stored in this page.
Diagrams (1)
| site | kind | credit | basis | caption | size | file | source page |
|---|---|---|---|---|---|---|---|
| cc | diagram | cropcirclecenter.com / Bertold Zugelder | site default | 575×415 51.6 KiB image/jpeg |
image 7b65e1cf2a19 | https://www.cropcirclecenter.com/date/1991/199101.html |
Date
January 1991, to month precision. What a source records is the day a formation was found and reported.
- reported by
- cc: January 1991
Place
What each source printed, and the coordinate derived from it. No source in this archive publishes a coordinate of its own.
- coordinate
- 42.370930, -71.049500 — place, ±2,000 m, by geonames, from the cc record
- on a map
- OpenStreetMap
| site | place | county | country | grid ref | what3words | fix |
|---|---|---|---|---|---|---|
| cc | Massachusetts | United States | 42.370930, -71.049500 place / geonames |
Crop and size
- crop
- ice (cc: ice)
- diameter
- not recorded by any source
- size as written
- not recorded
Source records
What each source published, side by side. A row whose values differ across the sources is marked: the archive prints the disagreement rather than choosing a winner.
| field | cc cropcirclecenter.com |
|---|---|
| id / slug | US19910133_A |
| name | Charles River |
| location | |
| county | Massachusetts |
| country | United States |
| date reported | 1991-01 |
| date precision | month |
| crop | ice |
| size | |
| diameter (ft) | |
| grid reference | |
| what3words | |
| map link | |
| credits | cropcirclecenter.com / Bertold Zugelder |
| source page | https://www.cropcirclecenter.com/date/1991/199101.html |
| link to the entity | singleton decided by none on 2026-09-11 |
| warnings | unknown_day; no_formation_page |
| record | cc/64c2b7191c1e9… raw record view: /formation/cc/64c2b7191c1e951abf28478a522437cc7b9af9a75a20059d275fa1c39e6890f7 in the preview app |
Texts
no text documents in the archive for this formation
Claims about this formation
no claim was extracted from a text about this formation
Geometry
1 diagram file(s) on this page. measured from the diagram itself, and experimental: the extractor's rotational order is right on 88.8 % of a 200-diagram hand-labelled set against a gate of 90 %, so read a number here beside the picture rather than instead of it.
| diagram | rotational symmetry | elements | rings | mirror | fill |
|---|---|---|---|---|---|
| cc 7b65e1cf | ≈ continuous (concentric circles) | 4 | 4 | 0.978 | 0.1828 |
Experimental, and marked ≈ wherever it appears. These numbers are read off a drawing, not off the field: the extractor's rotational order agrees with a hand-labelled set on 88.8 per cent of 200 diagrams against a gate of 90 per cent, its element count is within one on 97.5 per cent, and its ring count is not calibrated at all. Nothing in the analysis tree is derived from the rotational order while that gate is unmet.
Diagrams that look like these: cc 7b65e1cf— the nearest by perceptual hash. The whole archive is browsable by shape in the shape section, and this formation's own diagrams go straight into that grid: show them in the grid.
Neighbours
In time
- previous
- Merefa 5 December 1990, Merefa
- next
- Millersburg February 1991, Millersburg
- previous in US
- Gulf Breeze November 1990
- next in US
- Millersburg February 1991
- same day
- Ulm (Ulm) · JP19910133_A · Donderen (Donderen) · Bareham (Bareham) · Amersham (Amersham) · Beckhampton (Beckhampton) · Blackland (Blackland) · Bryn-y-Maen (Bryn-y-Maen) · Bryn-y-Maen (Bryn-y-Maen) · Caernarfon (Caernarfon) · Clench Common (Clench Common) · Clench Common (Clench Common) · Crawley (Crawley) · Crawley (Crawley) · Crawley (Crawley) · Downham Market (Downham Market) · Froxfield (Froxfield) · High Wycombe (High Wycombe) · Longstock (Longstock) · Newhaven (Newhaven) · Sapperton (Sapperton) · South Malling (South Malling) · Sparsholt (Sparsholt) · Sparsholt (Sparsholt) · Steeple Langford (Steeple Langford) · UK19911333_W (Wiltshire) · UK19911333_X (Yorkshire) · UK19911333_Y · US19910101_A
- within 7 days and 25 km
- none, or this formation has no coordinate at place confidence or better
In place
The nearest formations the archive can place.
Charles River
0 m away, 1993-02-01
Watertown8 August 1996Watertown
11.0 km away, 1996-08-08 WalthamSeptember 1979
Waltham
15.3 km away, 1979-09
Scituate1992Scituate
33.0 km away, 1992
Chelmsford5 August 1993Chelmsford
36.4 km away, 1993-08-05 Manchester1932
Manchester
77.0 km away, 1932
- same county and year
- none
Provenance
- entity built at
- 2026-09-11T19:20:39Z (derived from the link decisions, not from this build)
- index run ids
- none
- reviews applied
- none
- open queue pairs
- none
- entity record
- index/formations/US19910133_A.json · row in index/manifest.jsonl
- input digests
- entity 525cd2859497 · images b7672361e597 · texts 4f53cda18c2b · geo 4e82350b767a