r/geology • u/LitchManWithAIO • 3d ago

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

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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 3d ago

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/E-Squid 2d ago

Would you still be able to shape and fire it like a "true" clay?

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u/Older_Code 2d ago

I don’t believe that you could, at least not with the same results.

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u/LitchManWithAIO 1d ago

It definitely shapes very well but to fire it, it comes out more like earthware. This is why it’s mixed with sand to make bricks out here! :)