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Heart Urchin, Upper Cretaceous

truceburner

By truceburner
in Fossil ID

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truceburner Regular Member

truceburner

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Large heart urchin collected in Round Rock, TX, presumably upper Cretaceous. It's 4" x 4.5" and quite large compared to others collected at the same site. Hoping to find out more about it. Thanks!

post-7896-0-54118500-1332263711_thumb.jpgpost-7896-0-96221400-1332263715_thumb.jpgpost-7896-0-11428100-1332263719_thumb.jpg

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Uncle Siphuncle Regular Member

Uncle Siphuncle

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Looks like a big Macraster, Lower Cretaceous Washita Group, about 100-102 million years old.

Grüße,

Daniel A. Wöhr aus Südtexas

"To the motivated go the spoils."

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truceburner Regular Member

truceburner

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Thanks. Yeah, definitely the largest echinoid in my meager collection. Any suggestions for cleaning up the fossil? It looks pretty nice, but I wonder if I should try to remove some of the dark discoloration. What do you think? I'm happy to leave it as is, but would appreciate any suggestions.

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truceburner Regular Member

truceburner

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Updated to show some detail after cleaning. Left is back, right is front. Macraster obesus? It's a big one.

post-7896-0-92511800-1333333651_thumb.jpg

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