Logana Mbr., Lexington Limestone, Kentucky (Ordovician of the United States)

Where: Kentucky (38.0° N, 84.7° W: paleocoordinates 27.3° S, 63.2° W)

• coordinate estimated from map

• basin-level geographic resolution

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

• member-level stratigraphic resolution

Environment/lithology: offshore ramp; lithified, gray, argillaceous lime mudstone and lithified, dolomitic, gray, calcareous shale

• environmental call based on field notes of Holland and Patzkowsky

Size class: macrofossils

Preservation: original calcite

Reposited in the USNM

Primary reference: E. R. Cressman. 1973. Lithostratigraphy and depositional environments of the Lexington Limestone (Ordovician) of central Kentucky. USGS Professional Paper 768:1-61 [M. Patzkowsky/M. Patzkowsky/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 34546: authorized by Steven Holland, entered by Steven Holland on 09.09.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Palaeocopida -
 Cyrtodontida - Cyrtodontidae
Cyrtodontula sp. Tomlin 1931 clam
 Myalinida - Ambonychiidae
Ambonychia sp. Hall 1847 clam
 Modiomorphida - Modiomorphidae
Whiteavesia sp. Ulrich 1893 clam
Modiolodon oviformis Ulrich 1894 clam
Colpomya faba Hall 1847 clam
 Nuculida - Praenuculidae
 Nuculida - Cardiolariidae
Deceptrix sp. Fuchs 1919 clam
 Protobranchia - Malletiidae
 Trochonematoidea - Lophospiridae
Loxoplocus sp. Fischer 1885 snail
Loxoplocus (Lophospira)
 Bellerophontida - Pterothecidae
Carinaropsis cymbula Hall 1861 snail
 Murchisoniina - Eotomariidae
"Liospira aff. decipiens" = Liospira decipens
"Liospira aff. decipiens" = Liospira decipens Ulrich and Scofield 1897 snail
 Cyrtonellida - Cyrtolitidae
Cyrtolites aff. retrorsus Ulrich and Scofield 1897
 Strophomenida - Rafinesquinidae
 Atrypida - Anazygidae
Zygospira sp. Hall 1862
 Rhynchonellida - Trigonorhynchiidae
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema sp. Hall 1860
 Orthida - Dalmanellidae
Dalmanella sp. Hall and Clarke 1892
Dalmanella fertilis Ulrich 1909
Dalmanella sulcata Cooper 1956