ammonites
Elpidocrinus-Parapisocrinus tennesseensis Assoc., Henryhouse Fm., Cedar Hill (Silurian of the United States)

Where: Oklahoma (34.7° N, 96.6° W: paleocoordinates 28.5° S, 59.0° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Henryhouse Formation, Ludlow (422.9 - 418.7 Ma)

• Association is known from lower and middle Henryhouse. It is not clear from the text which of these is the source of this collection.

• formation-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; shelly/skeletal marl

• "There is some suggestion of storm winnowing, and whole or large fossils are often concentrated on bedding planes...crowns exceedingly rare, but most brachiopods and some trilobites intact...BA 4 seems likely...fauna very similar to that of camerate-rich portions of Brownsport Fm., Tenn., except that individual camerates are much less common in the Henryhouse...For detailed information on Henryhouse Formation facies and environments, see Amsden (1981)" [This marl facies is between shallower limestone facies and deeper graptolite shale facies according to some of Amsden's maps.]

•SEP environmental call based on given info

• "Environment: Much like that of the Pisocrinus Abyssocrinus antuquus Assoc. [PBDB coll. 26824], but skeletal debris is sometimes sufficiently common in some beds to term the lithology a grain-suppored marlstone, i.e. up to c. 50% skeletal debris. More frequently, skeletal debris is less significant (average perhaps 20%) and the lithology is a mud-supported marlstone. Individual beds range from less than 1 cm to several cm...most units even-bedded...skeletal grains generally unabraded"

Collection methods: Table 45.48, which gives abundances. I have added Bryozoa indet. and Ostracoda indet., which are mentioned in text but not listed in table. "The Bryozoan parts of this collection could not be relocated for counting..."

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner] more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26823: authorized by Michael Foote, entered by Michael Foote on 05.11.2002