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The Keyser Limestone is the lowest formation of the late Silurian to early Devonian Helderburg Group. It records stable platform deposits which accumulated in the quiet period between the Taconian and Acadian orogenies. This sample was collected and contributed by Dr. Michael Mengason.
A block 65cm by 45cm containing numerous fossil brittle starfish (too many to count) and some complete crinoids together with broken crinoid and starfish debris. This block contains a complex story about one point in time during the early part of the Jurassic, about 185 million years ago, when this part of the world w...