The landing marks found by John on the first night had a circular shape:
- Halt’s memo describes the landing marks as 1.5 inches deep and 7 inches in diameter, i.e. circular.
- The plaster cast made by Jim Penniston also shows a circular landing mark.
- In this interview Richard Bertolino describes the landing marks as circles, “cut out almost circular like you’d used a coffee can”: http://www.earthfiles333.com/earthfiles/audio/mp3/EarthFilesEpisode57_high.mp3
- Chris Armold visited the site around 04:00 on the first night. John Burroughs took him to the landing site and Armold (who is very skeptical) thinks the landing marks could be impressions of a coffee can, i.e. they are circular (source: http://web.archive.org/web/20021210083709/www.ufoworld.co.uk/v15.txt)
I always wondered why the landing marks on the photographs in the MOD files (especially the first and third one) look more like a V, they do not look circular at all to me:
http://www.mod.uk/NR/rdonlyres/884131E3-7DBF-4553-88C0-1FFD555B3967/0/hill_norton2.pdf
Then I suddenly realized: In the famous sketch of the triangular craft made by Jim, he not only tries to convey the shape of the craft and the location of the symbols of the craft. He also seems to indicate the shape of the footprints left by the craft. The front view in Jim’s sketch contains a line labeled “Footprint” pointing to a footprint shaped like a V:

So the craft sketched by Jim seems to have V-shaped footprints, V-shaped landing marks are on some of the landing site photographs, but the landing site found by John contained circular landing marks. Could this be related to the fact that their memories of the events on the first night are so very different?
Cheers,
Frank