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Updated: May 26, 2025
If the Challenger hypothesis, that the red clay is the residue left by dissolved Foraminiferous skeletons, is correct, then all these deposits alike would be directly, or indirectly, the product of living organisms.
Among the fossils very common in fresh-water deposits are the shells of Cypris, a minute bivalve crustaceous animal. Chara medicaginula; fossil. The seed-vessels and stems of Chara, a genus of aquatic plants, are very frequent in fresh-water strata. These seed-vessels were called, before their true nature was known, gyrogonites, and were supposed to be foraminiferous shells.
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