Ptychagnostus punctuosus zone, Farewell Terrane, AK - St. John and Babcock 1997 (Cambrian of the United States)

Where: Alaska (64.7° N, 163.4° W: paleocoordinates 64.7° N, 163.4° W)

• coordinate based on nearby landmark

• basin-level geographic resolution

When: Ptychagnostus punctuosus zone, Menevian (504.5 - 499.5 Ma)

• Specimens concentrated in a 40cm thick unnamed unit in the Farewell terrane (previously refered to as the Nixon Fork terrane or subterrane).

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified limestone

• Fossils are preserved in wackestone that is mostly light gray in color but is locally reddish or yellowish, but trilobites are concentrated in the upper 40-cm-thick limestone bed.

Preservation: cast

Primary reference: J. M. St. John and L. E. Babcock. 1997. Late Middle Cambrian trilobites of Siberian Aspect from the Farewell Terrane, Southwestern Alaska. Geological studies in Alaska by the U.S. Geological Survey, 1995 270-281 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10508: authorized by Mark Patzkowsky, entered by Phil Borkow on 14.05.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Artiopoda
 Agnostida - Peronopsidae
Peronopsis sp. Corda 1847
 Agnostida - Diplagnostidae
 Agnostida -
"Peratagnostus cicer" = Glaberagnostus cicer Tullberg 1880
Trilobita
 Asaphida - Anomocaridae
 Ptychopariida - Conocoryphidae
Tchaiaspis sp. n. sp. trilobite
 Ptychopariida - Solenopleuridae
Solenopleura sp. Angelin 1854 trilobite
Parasolenopleura sp. Westergard 1953 trilobite
 Corynexochida - Corynexochidae
 Corynexochida - Dorypygidae
Kootenia sp. n. sp.
Kootenia sp. n. sp. Walcott 1899 trilobite
 Corynexochida - Granularaspidae
Granularaspis sp. n. sp. Babcock and John 1995 trilobite
  - Holocephalinidae
Dasometopus breviceps Angelin 1878 trilobite
 Redlichiida - Agraulidae
 Redlichiida - Paradoxididae
Paradoxides sp. n. sp. Brongniart 1822 trilobite
 Redlichiida - Centropleuridae