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Credit Photo by Mark Kmiecik

Mark Kmiecik

BOTH HALVES OF SIDERITE CONCRETION, SPLIT BY HAMMER BLOW. SPLIT FACE APPROX. 45mm x 45mm (1-3/4" x 1-3/4"). ACETIC ACID BATH.

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Photo by Mark Kmiecik

From the album:

Mark's Mazon Creek Fossils

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Mark Kmiecik

Posted (edited)

Edited on 02/10/2022 to update ID. Originally posted as "Mazopherusa prinosi (colony?)". New ID suggested by Jack Wittry, known as "fiddlehead" on this forum.

Edited by Mark Kmiecik
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