Cob Marine Clay?

[Speireag Alden]

Howdy, all!

    As I scout around for a source of clay soil for earthen plaster and
eventual earthen floor, I've come across the mention of "marine clay".  Is
this good, bad or indifferent for earthen construction?  How is "marine
clay" different from any other kind of clay?

-Speireag.
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Speireag Alden, aka Joshua Macdonald Alden
Joshua.M.Alden.91 at alum.dartmouth.org
Usually found somewhere in the wilds of New Hampshire.
Nach sgrìobhaidh thugam 'sa Gàidhlig?