Bed 412, Lead Bell Shale (Cambrian of the United States)

Where: Idaho (42.0° N, 112.0° W: paleocoordinates 6.1° S, 91.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Albertella trilobite zone, Spence Tongue Member (Lead Bell Shale Formation), Dyeran (515.3 - 511.2 Ma)

• Listed as Albertella biozone

• group of beds-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, silty lime mudstone and poorly lithified, black, gray 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 75632: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 23.10.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• Peronopsis-Oryctocephalus-Elrathina 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 - Ptychopariidae
"Elrathina cf. spencei" = Ptychoparella
"Elrathina cf. spencei" = Ptychoparella trilobite
 Corynexochida - Dorypygidae
Ogygopsis typicalis
Ogygopsis typicalis Resser 1979 trilobite
 Corynexochida - Oryctocephalidae
Oryctocare sp., "Oryctocephalus walcotti" = Oryctocephalites reynoldsi, Thoracocare minuta
Oryctocare sp. Tomashpolskaya 1961 trilobite
"Oryctocephalus walcotti" = Oryctocephalites reynoldsi Reed 1899 trilobite
Artiopoda
 Agnostida - Eodiscidae
Pagetia rugosa
Pagetia rugosa Rasetti 1966
 Agnostida - Peronopsidae
"Peronopsis bonnerensis" = Pentagnostus bonnerensis
"Peronopsis bonnerensis" = Pentagnostus bonnerensis Resser 1938