Unit 4, McKenzie Formation, North Rose Hill Section (Silurian to of the United States)

Where: Allegany County County, Maryland (39.7° N, 78.8° W: paleocoordinates 29.1° S, 47.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: McKenzie Formation, Llandovery to Llandovery (443.4 - 423.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: lithified shale and lithified limestone

• Shale with numerous thin bands of limestone.

Primary reference: H. P. Woodward. 1941. Silurian System of West Virginia. West Virginia Geological Survey 14:1-326 [P. Wagner/K. Koverman/K. Koverman]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 41091: authorized by Pete Wagner, entered by Kimberly Koverman on 06.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Ostracoda
 Platycopida -
Gastropoda
 Murchisoniina - Hormotomidae
Hormotoma hopkinsi, "Hormotoma marylandica" = Gyrodoma marylandica
"Hormotoma marylandica" = Gyrodoma marylandica Clarke and Swartz 1913 snail
Cephalopoda
 Orthocerida - Orthoceratidae
Orthoceras sp. Breynius 1832