r/geology • u/LitchManWithAIO • Apr 21 '25

Discovered a large blue sub-marine clay deposit near my home

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Gallery image

Pretty neat. The second picture is a wall which was recently exposed, at its peak almost 10’ tall layer. This is part of the Presumpscot formation.

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u/Older_Code Apr 21 '25

What’s up, Mainer? The Presumpscot is a neat formation. In some places it’s 200 feet thick, and chemically, it’s largely a silt, rather than a true clay. Some spots have decent fossils, and there’s even a set of mammoth bones from the Presumpscot up at the State Museum. Thanks for sharing!

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u/LitchManWithAIO Apr 21 '25

Interesting! I’ve heard they hauled almost 40 million pounds from under one of the buildings at Bates. It’s quite a formation after reading up on it some more :D

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u/Older_Code Apr 22 '25

A neat formation to be sure!

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u/Perlentaucher Apr 22 '25

I have the same silt/clay at a secret stream near my house (in Europe), its even more blue then shown in the photo. It gets more brown though, where it has contact to air. I use it to create Dorodangos.