Top of Delamaran Stage, middle limestone Chisholm Fm., Utah - Sundberg 1999 (Cambrian of the United States)

Where: Millard County, Utah (39.5° N, 112.9° W: paleocoordinates 4.8° S, 92.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Glossopleura zone, Middle Limestone Member (Chisholm Formation), Delamaran (511.2 - 506.5 Ma)

• Stratigraphy information is combined in lithologic description.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified carbonate

• 29m of one to five-meter-thick cyclic carbonates that consist of, in ascending order: shallow subtidal, bioturbaed micrites; shallow-subtidal to peritidal, bioturbated, crinkly laminated micrites and dolostones of possible microbial origin; and shallow subtidal, oncolitic packstones and wackestones.

Preservation: cast

Primary reference: F. A. Sundberg. 1999. Candidate stratotype for base of Marjuman Stage. Laurentia 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcomission on Cambrian Stratigraphy 10-15 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10533: authorized by Mark Patzkowsky, entered by Phil Borkow on 18.05.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Only trilobites listed, although no other major groups were mentioned.
Show authors, comments, and common names
unclassified
  -
Glosopleura sp., Kootina pectenoides
Trilobita
 Ptychopariida - Ptychopariidae
Achlysopsis cf. liokata
Achlysopsis cf. liokata Fritz 1968 trilobite
 Ptychopariida -
Kochina vestita
Kochina vestita trilobite
 Ptychopariida - Alokistocaridae
Alokistocare carnatum, Alokistocare normale, Amecephalus laticudum
Alokistocare normale Resser 1938 trilobite
 Corynexochida - Dolichometopidae
Glossopleura boccar
Glossopleura boccar Walcott 1916 trilobite