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Updated: May 8, 2025
In all ages of the world's history up to the present day, rock-making has taken place fire-made rocks being fashioned underground, and water-made rocks being fashioned above ground though under water. Also in all ages different kinds of rocks have been fashioned side by side limestone in one part of the world, sandstone in another, chalk in another, clay in another, and so on.
Here then were organisms, as old as the cretaceous epoch, still alive, and doing their work of rock-making at the bottom of existing seas. What if Globigerina and the Coccoliths should not be the only survivors of a world passed away, which are hidden beneath three miles of salt water? The letter which Dr. Wyville Thomson wrote to Dr.
Or a lime-laden spring, making its way through the roof of an underground cavern, will leave all kinds of fantastic arrangements of limestone wherever its waters can trickle and drip. Such a cavern is called a "stalactite cave." So there are different kinds of fossil rock-making. There may be rocks made of other materials, with fossil simply buried in them.
In warm seas the most conspicuous of rock-making organisms are the corals known as the reef builders.
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