Where: Iowa (42.4° N, 91.3° W: paleocoordinates 19.1° S, 57.6° W)
• coordinate based on political unit
• basin-level geographic resolution
When: Blanding Formation, Rhuddanian to Rhuddanian (443.4 - 438.5 Ma)
• "Early to Middle Llandovery (late A-C3?)...According to Witzke (1981b) and Bowman (1985) the Waucoma is likely equivalent to the Tete des Morts, Blanding, and lower Hopkinton Formations, which crop out farther east in Iowa."
Environment/lithology: open shallow subtidal; bioturbated, shelly/skeletal wackestone and bioturbated, shelly/skeletal grainstone
•Waucoma and Brassfield: "undolomitized limestones with very low terrigenous clastic and chert content and echinoderm wackestone to grainstone (commonly packstone) fabrics"
•"Some degree of bioturbation in all three units...crossbedding and graded bedding..."
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 26691: authorized by Michael Foote, entered by Michael Foote on 24.10.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Anthozoa | |
Halysites sp. von Waldheim 1813 tabulate coral | |
Heliolites sp. Dana 1846 tabulate coral | |
Syringopora sp. Goldfuss 1826 tabulate coral | |
Favosites sp. Lamarck 1816 tabulate coral | |
Rugosa indet. horn coral | |
Arachnophyllum sp. Dana 1846 horn coral | |
Trilobita | |
Encrinuridae indet. Angelin 1854 trilobite | |
Calymene sp. Brongniart 1822 trilobite | |
Strophomenata | |
| |
"Merciella sp." = Leptellina (Merciella)
"Merciella sp." = Leptellina (Merciella) Lamont and Gilbert 1945 | |
Stropheodontidae indet. Caster 1939 | |
Leptaena sp. Dalman 1828 | |
Rhynchonellata | |
Rhynchonellida indet. Kuhn 1949 | |
Stricklandiidae indet. Schuchert and Cooper 1931
Microcardinalia sp. Boucot and Ehlers 1963 | |
Orthida indet. Schuchert and Cooper 1932 | |
Isorthis sp. Kozlowski 1929 | |
? Dalejina sp. Havlicek 1953 | |
Platystrophia sp. King 1850 | |
Flabellitesia sp. Zhang 1989 | |
Plectatrypa sp. Schuchert and Cooper 1930 | |
Gastropoda | |
Platyceras sp. Conrad 1840 snail | |
Straparollus sp. de Montfort 1810 snail | |
Cephalopoda | |
Nautiloidea indet. Agassiz 1847 nautiloid | |
Brockocystis nodosaria Foerste 1919 | |
Crinoidea | |
Inadunata indet. Sea lily | |
Calceocrinidae indet. Meek and Worthen 1869 Sea lily | |
Edrioasteroidea | |
Pyrgocystis sp. Bather 1915 | |
Cyclocystoidea | |
Polytryphocycloides sp. Smith and Paul 1982
Sievertsia sp. Smith and Paul 1982 |