Locality M-1, Gasconade Formation, Franklin County, Missouri - Stinchcomb 1986 (Ordovician of the United States)

Where: Franklin County, Missouri (38.2° N, 91.1° W: paleocoordinates 23.4° S, 80.7° W)

• outcrop-level geographic resolution

When: Gasconade Formation, Tremadoc (485.4 - 477.7 Ma)

• The Van Buren Formation (Bridge 1930) is now referred to in an interval sense with the Van Buren fauna comprising a zone in the lowerpart of the Gasconade Formation. The chert in which the fossils occur may or may not be in place stratigraphically. So, a rating of "A" through "F" indicates stratigraphic reliability with "A" = no question to stratigraphic position of horizon and "F" = residual material of different ages. Reliability Index = E

• formation-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm

• Strata are in pockets of the Ozark Uplifts
• cryptalgal layer (below a zone of chert thrombolites). However, an exact lithology is not given.

Preservation: original calcite, replaced with silica

Collection methods: Taxonomic list does not include stromatolites in which specimens were found.

Primary reference: B. L. Stinchcomb. 1986. New Monoplacophora (Mollusca) from Late Cambrian and Early Ordovician of Missouri. Journal of Paleontology 60(3):606-626 [M. Patzkowsky/P. Borkow/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 8943: authorized by Mark Patzkowsky, entered by Phil Borkow on 07.09.2000, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Hemithecellitina - Hemithecellidae
Conodia acuminata n. sp., Conodia levicosta n. gen. n. sp.
Conodia acuminata n. sp. Stinchcomb and Darrough 1995
Conodia levicosta n. gen. n. sp. Stinchcomb and Darrough 1995
 Tryblidiida - Kirengellidae
"Gasconadeoconus expansus" = Kirengella expansus
"Gasconadeoconus expansus" = Kirengella expansus Stinchcomb 1986
[entered as Gasconadeoconus expandus]
 Tryblidiida - Tryblidiidae
Proplina meramecensis n. sp. Stinchcomb 1986
Proplina cornutaformis Walcott 1879
Proplina sibelius n. sp. Stinchcomb 1986
[entered as Proplina sibeliusi]
 Paleoloricata - Mattheviidae
Hemithecella quinquelites n. sp. Stinchcomb and Darrough 1995 chiton
Hemithecella expansa Butts 1941 chiton
Robustum nodum n. gen. n. sp. Stinchcomb and Darrough 1995 chiton
Robustum phallerium n. sp. Stinchcomb and Darrough 1995 chiton