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 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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Seller's Description:
Fine copy in fine dust jacket (in mylar). Octavo. 182 pps. Illustrated in black, white and color. Important reference work. Important reference work. Very scarce in this condition.