North America, Southern United States, Texas, Brown County, Late Carboniferous / Pennsylvanian period, ca. 300 to 296 million years ago. This is a spectacular, large shale slab with several large Archaeocidaris sp. sea urchin fossils, complete with all spines, in their original rock matrix as found. This is an extremely well-preserved group of four complete and a fifth partial urchin fossil on their original host stone with most, if not all, of their associated spines. The color of the fossil urchins is a natural creamy gold color which contrasts with the greenish gray host rock. Large matrices with multiple fossils like this example are not commonly sold, and those that are, are often restored with reattached spines. Some of the spines here are still partially covered by the host rock surrounding them, indicating their natural state! Size of matrix: 11.5" L x 8.5" W (29.2 cm x 21.6 cm); largest urchin: 5" L (12.7 cm)
Archaeocidaris is an extinct prehistoric genus of echinoid (sea urchin) the lived during the late Devonian to Permian era, and has been found at sites in North America, Europe, and North Africa.
Please note that this piece is a dropship item, meaning that it will be shipping from the consignor's location. All information regarding condition, size, stone identification, and metal content have been provided by the consignor.
Provenance: private California, USA collection
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#187525
Condition
No artificial assembly or spine reconstruction. Verso of shale matrix reinforced for strength and stability. Numerous spines that are still partially covered by the host rock surrounding them (rather than all the spines laying on top of the surface of the rock, which would suggest artificial assembly / adhesive).