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Graptolites: Writing in the Rocks - Palmer, Douglas, Dr., Ph.D. (Editor), and Rickards, Barrie (Editor)
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Graptolites lived in the earth's oceans from 540 million years ago to 320 million years ago, when they became extinct. For most of that time they dominated the upper layers of the ocean in tropical regions as the earth's first large zooplankton.

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Graptolites: Writing in the Rocks 2001, Boydell Press

ISBN-13: 9780851152622

Hardcover