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While removing an unknown sponge by acid dissolution from the Permian Fort Apache Member of the Schnebly Hill Formation from northern Gila County in Arizona I found several silicified brachiopods with spines. Several Bellaclathrus spinosus brachiopods were present ranging from 0.75 to 1.5 inch across and had spines as long as 1 inch. The pedicle valve of the brachiopod in the first and second photos is about 1 inch wide not including spines. This is the finest specimen with spines that I have found. The third photo shows the brachiopod attached to several others of the same species. Fourth and fifth photos are from Winters 1963 reference below. Taxonomy per Fossilworks: http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=27149 Winters, Stephen S. 1963. Supai Formation (Permian) of eastern Arizona. Geological Society of America Memoir 89:1-99.
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This most common brachiopod from the Pennsylvanian Kaibab Limestone in Arizona came from the collection of John Weber. Link Primary reference: McKee, Edwin D., 1938. The environment and history of the Toroweap and Kaibab Formations of northern Arizona and southern Utah. Carnegie Institution of Washington Publication 492:1-268 Link
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A common silicified sponge from Permian Kaibab Limestone. Index sponge for Kungarian/Leonardian Age rocks from the western US. Reference: http://geology.byu.edu/home/sites/default/files/actinocoelia-maeandrina-finks-from-the-kaibab-limestone-of-northern-arizona-leland-r.-griffin.pdf
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Well preserved sponges are rare in Arizona except for Actinocoelia maeandrina in the Permian (Leonardian) age Kaibab Limestone. I found well preserved ramose sponges with hollow interiors. Using HCl acid, my silicified sponge was dissolved out of the Leonardian Fort Apache Member of the Schnebly (formerly Supai) Formation, which is mostly limestone in the area. The member contains a rich molluscan fauna dominated by pelecypods and gastropods. Echinoid pieces are common. Coral, bryozoan and nautiloids are rare; sponges are previously unreported. My sponge may be a new species or may be an extension of range of a known species. Collected in August 2013. For more information on the fossils of the Fort Apache Member see: Winters, S.S., 1963, Supai Formation (Permian) of eastern Arizona: Geological Society of America Memoir, 89, 99 p.
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