USGS 6127-CO; Nelsonville, Landing Run (Ordovician of the United States)

Where: Nelson County, Kentucky (37.7° N, 85.5° W: paleocoordinates 26.4° S, 59.9° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Amorphognathus ordovicicus conodont zone, Rowland Member (Drakes Formation), Richmondian (449.6 - 445.5 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; dolomitic lime mudstone

• "Very shallow water, restricted marine and intertidal mudflat conditions"
• " [...] dolomitic mudstone and micrograined limestone [...]. Limestone beds in these units commonly contain mud cracks (Weir and others, 1984) and are only sparsely fossiliferous having local occurrences of brachiopods, bryozoans, gastropods, and ostracodes."

Size class: macrofossils

Preservation: recrystallized, replaced with calcite

Reposited in the USNM

Collection methods: bulk,

Primary reference: R. C. Frey. 1995. Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati Arch region of Kentucky, Indiana, and Ohio. U.S. Geological Survey Professional Paper 1066P:1-126 [S. Holland/S. Holland]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87824: authorized by Björn Kröger, entered by Torsten Liebrecht on 25.03.2009, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• see comments on lithology
Show authors, comments, and common names
Cephalopoda
 Orthocerida - Proteoceratidae
Treptoceras cincinnatiensis
Treptoceras cincinnatiensis Miller 1875
USNM 468691a, 468691b
Rhynchonellata
 Orthida - Platystrophiidae
Platystrophia ponderosa