Marden

Images

7 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 (2)

diagram cropcirclecenter.com / Bertold Zugelder site default diagram cropcirclecenter.com / Bertold Zugelder site default

Photographs (5)

aerial Steve Alexander image credit other Lucy Pringle page credit other Lucy Pringle page credit other Lucy Pringle page credit other Lucy Pringle page credit

Date

20 August 2005, to day precision. What a source records is the day a formation was found and reported.

reported by

cc: 20 August 2005 lp: 20 August 2005

weekday

Saturday, day 232 of the year, ISO week 33, summer

sun and moon

33.4 days before the September equinox; moon full (99% lit), 0.8 days after the full moon (computed at 12:00 UTC; a reported date is a discovery date, not a creation date)

Place

What each source printed, and the coordinate derived from it. No source in this archive publishes a coordinate of its own.

coordinate

51.320913, -1.875751 — place, ±2,000 m, by os_open_names, from the cc record

on a map

OpenStreetMap

Crop and size

crop

wheat (cc: wheat, lp: —)

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.

Geometry

2 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.

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 b5e7e2dc— 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

Northwood 19 August 2005, Northwood

next

Alton Priors 21 August 2005, Alton Priors

previous in UK

Weston Turnville 15 August 2005

next in UK

Alton Priors 21 August 2005

same day

Meopham (Meopham)

within 7 days and 25 km

Alton Priors 21 August 2005, 4.9 km away, 1 day(s) apart · Cherhill 21 August 2005, 13.2 km away, 1 day(s) apart

In place

The nearest formations the archive can place.

Marden27 May 1991
Marden
0 m away, 1991-05-27 Marden Henge23 August 2013
Marden Henge
0 m away, 2013-08-23 Chirton7 August 2002
Chirton
1.5 km away, 2002-08-07 Chirton9 August 2005
Chirton
1.5 km away, 2005-08-09 Chirton27 July 2011
Chirton
1.5 km away, 2011-07-27 Chirton31 July 2013
Chirton
1.5 km away, 2013-07-31

same county and year

Alton Barnes 1 May 2005 · Cherhill 10 May 2005 · Milk Hill 29 May 2005 · Beckhampton 5 June 2005 · Milk Hill 11 June 2005 · Clatford Bottom 12 June 2005 · Monkton Down 20 June 2005 · Shrewton 20 June 2005 · Lockeridge 22 June 2005 · Lurkeley Hill 22 June 2005 · Avebury Trusloe 23 June 2005 · Rockley Down 23 June 2005 · Silbury Hill 26 June 2005 · Alton Barnes 3 July 2005 · Devizes 3 July 2005 · Silbury Hill 9 July 2005 · Waden Hill 16 July 2005 · Milk Hill 17 July 2005 · Alton Barnes 18 July 2005 · Savernake Forest 19 July 2005 and 20 more

Provenance

entity built at

2026-09-15T21:14:17Z (derived from the link decisions, not from this build)

index run ids

20260915T211417Z-index-build

reviews applied

none

open queue pairs

none

entity record

index/formations/UK20050820_A.json · row in index/manifest.jsonl

input digests

entity f146fc31abdc · images 562a8ba13f87 · texts 4f53cda18c2b · geo c4032dd7e42c