Where: Iowa (42.3° N, 90.4° W: paleocoordinates 19.7° S, 57.2° W)
• coordinate based on political unit
• local area-level geographic resolution
When: Mosalem Formation, Rhuddanian to Rhuddanian (443.4 - 438.5 Ma)
• "Early Silurian (early Llandovery), based on graptolites, i.e. zones 16-19 of the British succession (Berry and Boucot 1970)." [I.e., acuminatus through gregarius Zones, which would imply an age range of Rhuddanian through early Aeronian.]
• formation-level stratigraphic resolution
Environment/lithology: lagoonal or restricted shallow subtidal; burrowed, gray, argillaceous, cherty/siliceous, carbonaceous dolomite
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 26860: authorized by Michael Foote, entered by Michael Foote on 06.11.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Edrioasteroidea | |
Pyrgocystis sp. Bather 1915 | |
Pterobranchia | |
Dendroidea indet. Nicholson 1872 graptolite | |
"Diplograptus cf. modestus" = Neodiplograptus modestus
"Diplograptus cf. modestus" = Neodiplograptus modestus Lapworth 1876 graptolite | |
Palaeoscolecida | |
Gastropoda | |
Gastropoda indet. Cuvier 1795 snail | |
Bivalvia | |
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam | |
Polychaeta | |
Sphenothallus sp. Hall 1847 | |
Rhynchonellata | |
Rhynchonellida indet. Kuhn 1949 | |
Strophomenata | |
Strophomenida indet. Opik 1934 | |
Leptaena "rhomboidalis" Wahlenberg 1818 | |
Lingulata | |
"Lingula cuneata" = Lingulella cuneata
"Lingula cuneata" = Lingulella cuneata Conrad 1839 | |
Lecathylus | |
Lecathylus gregarius The genus is variably spelled "Lecthyalus" and "Lecthaylus" in this reference, but the correct form is "Lecathylus" according to Treatise on Invertebrate Paleontology, volume W.
| |
Scyphozoa | |
Metaconularia sp. jellyfish |