Pisocrinus-Bouskacrinus Assoc., Bainbridge Limestone Unit 2 (Silurian of the United States)
Where: Missouri (37.8° N, 90.1° W: paleocoordinates 28.5° S, 53.8° W)
• coordinate based on political unit
• outcrop-level geographic resolution
When: Bainbridge Limestone Formation, Ludlow (427.4 - 423.0 Ma)
• Unit 2 of Bainbridge Limestone (of Bounk 1975 and Barrick 1978). [Lower Moccasin Springs Formation, Bainbridge Group of Lowensant (1949).]
• member-level stratigraphic resolution
Environment/lithology: deep subtidal ramp; shelly/skeletal wackestone and shelly/skeletal, gray grainstone
• "The brachiopod fauna is very diverse and shows affinities both with that of the Henryhous Formation, Oklahoma and the Brownsport Formation, Tennessee...[Few complete crowns]...root systems can be very common in some horizons...little indication of wave disturbance, and some dissociated echinoderm specimens have isolated plates in near proximity, suggesting that variations in clastic input, rather than winnowing, are responsible for the noted differences in skeletal grain percentages. Individual grains slightly to moderately abraded, microborins common. Brachiopos often articulated, but are also major debris contributors. Overall best interpreted as outer BA4 to inner BA 5, somewhat landward of the upper Bainbridge Pisocrinus Association [PBDB coll. 26821] and graptolite-bearing units."
•SEP environmental call based on given info.
• "Varies from moderately to abundantly fossiliferous. There are two common lithologies: earthy red calcilutites with scattered fossil debris seldom exceeding 20% (wackestone) and very fossiliferous, echinoderm-rich red or gray calcilutites to calcarenites with from 50% to as much as 70% skeletal debris (wackestone-packstone textures)."
Collection methods: Table 45.47, which gives abundances.
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 26822: authorized by Michael Foote, entered by Michael Foote on 05.11.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
| unclassified | |
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| Anthozoa | |
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Anthozoa indet. Ehrenberg 1834 | |
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Favosites sp. Lamarck 1816 tabulate coral | |
| Stylophora | |
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Mitrata indet. Jaekel 1918 | |
| Rhombifera | |
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Caryocrinites sp. Say 1825 | |
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| Blastoidea | |
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Troosticrinus minimus blastoid | |
| Crinoidea | |
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Homocrinus "n. sp." Hall 1852 Sea lily | |
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Myelodactylus "n. sp." Hall 1852 Sea lily | |
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Eohalysiocrinus "n. sp." Prokop 1970 Sea lily
Grypocrinus "n. sp." Strimple 1963 Sea lily | |
Pisocrinus (Pisocrinus) "sp. nov. 1", Pisocrinus (Pisocrinus) "sp. nov. 2", Pisocrinus (Pisocrinus) glabellus, Pisocrinus spatulatus, "Parapisocrinus quinquelobus" = Parapisocrinus quinquelobus, "Pisocrinus gorbyi" = Parapisocrinus quinquelobus
Pisocrinus (Pisocrinus) glabellus Sea lily
"Parapisocrinus quinquelobus" = Parapisocrinus quinquelobus Ausich and Copper 2010 Sea lily
"Pisocrinus gorbyi" = Parapisocrinus quinquelobus Ausich and Copper 2010 Sea lily Subgenus listed only as (G.)
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Litocrinus "n. sp." Lane and Sevastopulo 1982 Sea lily
? Desmacriocrinus "n. sp." Strimple 1966 Sea lily | |
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Botryocrinus "sp. nov. 1" Angelin 1878 Sea lily
Botryocrinus "sp. nov. 2" Angelin 1878 Sea lily | |
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Bouskacrinus laudoni Sea lily | |
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Thalamocrinus ovalis Sea lily | |
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Amphipsalidocrinus "n. sp." Weller 1930 Sea lily | |
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Lampadosocrinus "n. sp." Strimple and Koenig 1956 Sea lily
? Lageniocrinus "n. sp." de Koninck 1854 Sea lily | |
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Passalocrinus "n. sp." Sea lily | |
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Hagnocrinus "n. sp." Frest and Strimple 1977 Sea lily
Hagnocrinus balli Frest and Strimple 1977 Sea lily
Hagnocrinus bainbridgensis Frest and Strimple 1977 Sea lily | |
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"Cordylocrinus" dubius Sea lily | |
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Lampterocrinus "n. sp." Roemer 1860 Sea lily | |
| Brachiopoda | |
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Brachiopoda indet. Cuvier 1805 | |
| Strophomenata | |
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Cliftonia "n. sp." Foerste 1909 | |
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949 | |
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Leangella sp. Opik 1933 | |
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Leptaena oklahomensis Amsden 1951 | |
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Leptaenisca cf. irregularis Amsden 1951 | |
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Strophonella sp. Hall 1879 | |
| Rhynchonellata | |
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Eospirifer sp. Schuchert 1913 | |
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Merista sp. Suess 1851 | |
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Meristina sp. Hall 1867 | |
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Homoeospira sp. Hall and Clarke 1893 | |
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Dalejina sp. Havlicek 1953 | |
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Isorthis sp. Kozlowski 1929
Resserella brownsportensis Amsden 1949 | |
"Lissatrypa henryhousensis" = Lissatrypa, "Nanospira sp." = Lissatrypa
"Lissatrypa henryhousensis" = Lissatrypa
"Nanospira sp." = Lissatrypa Twenhofel 1914 | |
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Stegerhynchus sp. Foerste 1909 | |
| Chileata | |
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Dictyonella gibbosa Hall 1868 | |
| Lingulata | |
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Orbiculoidea sp. d'Orbigny 1847 | |
| Bryozoa | |
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Bryozoa indet. Ehrenberg 1831 | |
| Gastropoda | |
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Cyclonema fasciata Ball 1938 snail
Platyostoma sp. Conrad 1842 snail | |
| Deuteropoda | |
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Ostracoda indet. Latreille 1802 ostracod | |
| Trilobita | |
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Dalmanites spp. Barrande 1852 trilobite | |