Rockhounding for Beginners by Lars W. Johnson

Author:Lars W. Johnson
Language: eng
Format: epub
Publisher: Adams Media
Published: 2021-06-08T00:00:00+00:00

CRINOID

Fossil

Category: Fossil

Mohs Scale: 3–4

Colors: Gray, tan, brown

Luster: Earthy, dull

Transparency: Opaque; thin sections may be translucent

Description: Crinoids are marine animals of the echinoderm group, which includes starfish and sea urchins. They consist of a segmented stem, branches, and leaflike arms. Crinoids frequently become fossilized in limestone and shale.

North American Locations: Mountains, plains, forests, river gravels, and lake and ocean shorelines across North America.

Collecting Tips: The best crinoid-collecting sites are exposures of weathered limestone and shale. Screens are helpful in recovering small fossils such as the disklike segments of crinoid stems.

Processing Tips: Crinoid fossils are fragile and should be cleaned only with water and a soft brush.

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