Also known as Helminthochiton from the Francis Formation of Oklahoma
Where: Oklahoma (34.8° N, 96.7° W: paleocoordinates 6.0° S, 31.4° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Francis Formation, Missourian (305.9 - 303.4 Ma)
• formation-level stratigraphic resolution
Environment/lithology: offshore; lithified shale
• The Francis Formation as exposed in the quarry is a dark-gray to black shale and mudstone which weathers in a blocky fashion. An abundant assortment of fossils is present which represents a diverse assemblage of shallow-water forms. Crinoid fragments are especially abundant, including numberous dorsal cups and a few complete crowns.
Primary reference: G. D. Morgan. 1924. Geology of the Stonewall quadrangle, Oklahoma. Oklahoma Bureau of Geology Bulletin 2:1-149 [P. Wagner/P. Wagner/P. Wagner]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 39813: authorized by Pete Wagner, entered by Kimberly Koverman on 07.06.2004, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
• Lophophyllidium profundum, Echinocrinus sp., Crurithyris planoconvexa, Chonetes granulifer, Kozlowskia splendens, Linoproductus prattenianus, Neospirifer dunbari, Astartella vera, Ameura major are reported from the Francis Formation by Morgan (1924, p. 116-118). These were added as the primary reference, although it is only implied that Frederickson found these himself at this particular locality.
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