Where: Alexander County, Illinois (37.2° N, 89.4° W: paleocoordinates 24.7° S, 62.9° W)
When: Normalograptus extraordinarius graptolite zone, Leemon Formation, Gamachian (449.5 - 443.7 Ma)
• Amorphognathus ordovicicus conodont zone
•Conochitina scabra chitinozoan zone
•Top of Normalograptus extraordinarius and Amorphognathus ordovicicus zones.
•Marks end of HICE
• bed-level stratigraphic resolution
Environment/lithology: ooidal, cherty/siliceous limestone
Size class: macrofossils
Preservation: original silica
Primary reference: T. E. Savage. 1913. Stratigraphy and paleontology of the Alexandrian Series in Illinois and Missouri. Part I. Illinois Geological Survey, Bulletin 23:1-124 [G. Webster/G. Webster]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 173287: authorized by Pete Wagner, entered by Pete Wagner on 15.09.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Trilobita | |
"Metapolichas breviceps" = Metopolichas
| |
Gastropoda | |
Cyclonema daytonensis Foerste 1899 snail | |
"Lophospira fasciata n. sp." = Eunema fasciata
"Lophospira fasciata n. sp." = Eunema fasciata Savage 1913 snail | |
Rhynchonellata | |
"? Hindella ambigua" = Cryptothyrella ovoides
"? Hindella ambigua" = Cryptothyrella ovoides Savage 1913 | |
Dalmanella edgewoodensis Savage 1913 | |
Atrypa putilla Hall and Clarke 1894 | |
"Atrypa praemarginalis" = Eospirigerina putilla
"Atrypa praemarginalis" = Eospirigerina putilla Hall and Clarke 1894 | |
"? Camarotoechia concinna" = Stegerhynchus concinna, "Stegerhynchus concinna" = Stegerhynchus concinna, "? Camarotoechia antiqua" = Stegerhynchus antiqua
"? Camarotoechia concinna" = Stegerhynchus concinna Savage 1913
"Stegerhynchus concinna" = Stegerhynchus concinna Savage 1913
"? Camarotoechia antiqua" = Stegerhynchus antiqua Savage 1913 | |
"Rhynchotreta parva" = Thebesia thebesensis
"Rhynchotreta parva" = Thebesia thebesensis Foerste 1909 | |
Anthozoa | |
"Zaphrentis stokesi" = Zaphrenthis
"Zaphrentis stokesi" = Zaphrenthis horn coral |