USGS 6419-CO. East of Wilmore (Ordovician of the United States)

Where: Jessamine County, Kentucky (37.9° N, 84.6° W: paleocoordinates 27.4° S, 63.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Logana Limestone Member (Lexington Limestone Formation), Kirkfieldian (460.9 - 449.5 Ma)

• "Lower part of the Logana Member, Lexington Limestone."

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; tabular, argillaceous limestone and shale

• "Cressman (1973) indicated that the Logana Member represented the height of the initial marine transgression, deposited under quiet-water conditions at water depths below wave base";

•sequence stratigraphy is according to McLaughlin et al. (2004, Palaeogeogr. Palaeoclimat. Palaeoecol., 210)

• [...] interbedded, thin, planar, argillaceous limestone and shale [...] up to 50 ft thick [...] containing a more sparse fauna of dalmanellid brachiopods, bryozoans, pelecypods, univalved mollusks, and nautiloids."

Size class: macrofossils

Preservation: recrystallized, replaced with silica

Reposited in the USNM

Collection methods: bulk, acetic,

• " [...] specimens were obtained from bulk rock collections (36,000 pounds (lbs) of limestone) made by USGS field parties in the 1960's and 1970's." This statement not only applies to the Wilmore locality. For further details on collection methods see p. P22 in the primary reference

Primary reference: G.P. Wahlman. 1992. Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region. United States Geological Survey Professional Paper 1066(O):1-123 [P. Wagner/P. Wagner/E. Ito]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87825: 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
unclassified
  -
Trilobita
 Proetida - Proetidae
Decoroproetus "sp. 2"3 Pribyl 1946 trilobite
Cephalopoda
 Orthocerida - Proteoceratidae
Isorthoceras albersi2 Miller and Faber 1894
USNM 468703 (suite of specimens, no exact number given)
 Orthocerida - Tripteroceratidae
Allumettoceras cf. tenerum2 Billings 1860
USNM 468670, 468738
Asteroidea
  - Hudsonasteridae
"Promopalaeaster finei" = Mesopalaeaster finei1
"Promopalaeaster finei" = Mesopalaeaster finei1 Ulrich 1879 sea star