5 (Silurian to of the United States)
Where: Illinois (37.3° N, 89.4° W: paleocoordinates 25.7° S, 57.7° W)
• coordinate estimated from map
When: St. Clair Formation, Llandovery to Llandovery (443.4 - 427.4 Ma)
• 4,8 meters above base.
Environment/lithology: lithified limestone
• The St. Clair Formation at Lindsey Cemetery is a pink fossiliferous limestone with medium to thick bedding. The formation unconformably overlies the Sexton Creek Limestone, which is the Brassfield Limestone equivalent in southern Illinois. A single sample from the top of the Sexton Creek yielded an undiagnostic conodont collection with representatives of Decoriconus, Panderodus, and Walliserodus. The St. Clair grades upwards into a poorly exposed sequence of thin bedded siltstones which is referred to the Moccasin Springs Formation. At Lindsey Cemetery, the St. Clair is about 7 m (23 feet) thick.
Size class: microfossils
Primary reference: B. J. Cooper. 1976. Multielement Conodonts from the St. Clair Limestone (Silurian) of Southern Illinois. Journal of Paleontology 50(2):205-217 [W. Kiessling/E. Jarochowska]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 188082: authorized by Emilia Jarochowska, entered by Sarah Haegele on 22.08.2017
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
Conodonta | |
Panderodus unicostatus Branson and Mehl 1933 conodont | |
"Ozarkodina excavata" = Wurmiella excavata
"Ozarkodina excavata" = Wurmiella excavata Branson and Mehl 1933 conodont | |
Belodella cf. devonica conodont
Walliserodus sancticlairi Cooper 1976 conodont | |
Dapsilodus obliquicostatus Branson and Mehl 1933 conodont | |
Decoriconus fragilis Branson and Mehl 1933 conodont |