Bed 444, Lead Bell Shale (Cambrian of the United States)

Where: Utah (42.0° N, 112.0° W: paleocoordinates 5.7° S, 89.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Glossopleura trilobite zone, Spence Tongue Member (Lead Bell Shale Formation), Delamaran (511.2 - 506.5 Ma)

• Listed as Glossopleura biozone

• group of beds-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, silty lime mudstone and poorly lithified, black shale

• Outer detrital belt; Liddell, Wright, and Brett (1997) note that Langston Fm. (Spence Shale) deepens from Antimony Canyon (primarily outer carbonate belt) to Miners Hollow [both Utah] to Oneida Narrows [Idaho] (outer detrital belt/deep ramp)
• Dark, silty micrite and gray to gray-black, laminated shales

Size classes: macrofossils, mesofossils

Preservation: soft parts

Primary reference: D. P. Campbell. 1974. Biostratigraphy of the Albertella and Glossopleura zones (lower Middle Cambrian) of northern Utah and southern Idaho. M.S. thesis. University of Utah, UT [P. Novack-Gottshall/P. Hearn]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 75639: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 23.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• Upper faunule; sample chosen at random; a single horizon, but unsure whether single or pooled samples; biostratigraphy only covers trilobites and echinoderms, but probably most of the fauna
Show authors, comments, and common names
Trilobita
 Ptychopariida - Alokistocaridae
"Alokistocare idahoense" = Amecephalus idahoense
"Alokistocare idahoense" = Amecephalus idahoense Resser 1939 trilobite
 Corynexochida - Dolichometopidae
Athabaskia bithus, Athabaskia wasatchensis, Glossopleura gigantea
Glossopleura gigantea Resser 1939 trilobite
 Corynexochida - Zacanthoididae
Zacanthoides idahoensis
Zacanthoides idahoensis Walcott 1908 trilobite
 Corynexochida - Dorypygidae
Kootenia mendosa
Eocrinoidea
 Gogiida - Eocrinidae
Gogia kitchnerensis
Gogia kitchnerensis Sprinkle 1973
Ctenocystoidea
 Ctenocystoida - Ctenocystidae
Ctenocystis utahensis
Ctenocystis utahensis Robison and Sprinkle 1969