MF-22. 0.6 km north and 0.6 km west of Arbor (Ordovician of the United States)

Also known as Roadcut on gravel road, northside of gravel road

Where: Cape Girardeau County, Missouri (37.2° N, 89.8° W: paleocoordinates 25.4° S, 76.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Smithville Formation, Cassinian (482.3 - 470.0 Ma)

• N. American E Fauna, Reutterodus andinus zone, middle Blackhillsian.

• group of beds-level stratigraphic resolution

Environment/lithology: limestone

Size class: macrofossils

Preservation: replaced with silica

Reposited in the USNM

Collection methods: bulk, hydrochloric

Primary reference: M. F. Fix. 1975. The Paleontology and stratigraphy of the Smithville and Blackrock Formations of Southeastern Missouri. M.S. Thesis, Geology, Washington University 1-147 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 75561: authorized by Pete Wagner, entered by Pete Wagner on 16.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Rostroconchia
 Conocardiida - Eopteriidae
? Eopteria indet. Billings 1865
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
 Murchisoniina - Hormotomidae
Hormotoma sp. Salter 1859 snail
? Plethospira aff. cassina Whitfield 1886 snail
 Murchisoniina - Eotomariidae
"Murchisonia (Turritoma) cf. acrea" = Turritoma acrea
"Murchisonia (Turritoma) cf. acrea" = Turritoma acrea Billings 1865 snail
 Murchisoniina - Straparollinidae
Straparollina aff. cassina Whitfield 1886 snail
 Murchisoniina - Lophospiridae
Lophospiridae indet. Wenz 1938 snail
Ectomaria adventa Butts 1926 snail
Donaldiella cicelia Billings 1865 snail
Lophospira sp. Whitfield 1886 snail
 Euomphalina - Raphistomatidae
Ceratopea unguis Yochelson and Bridge 1957 snail
operculum
 Euomphalina - Macluritidae
"Maclurites smithvillensis" = Teiichispira ponderosa
"Maclurites smithvillensis" = Teiichispira ponderosa Billings 1865 snail
 Euomphalina - Helicotomidae
"Lophonema sp." = Lophonema, Lophonema taneyensis, "Polhemia indet." = Lophonema
"Lophonema sp." = Lophonema Purdue and Miser 1916 snail
Lophonema taneyensis Cullison 1944 snail
"Polhemia indet." = Lophonema Purdue and Miser 1916 snail
 Bellerophontida - Tropidodiscidae
"Tropidodiscus (Umbilicatus) macer" = Peruniscus macer
"Tropidodiscus (Umbilicatus) macer" = Peruniscus macer Billings 1865 snail