Lead Bell Shale, location: 781 (Cambrian of the United States)

Also known as Spence Shale

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

• coordinate estimated from map

• local area-level geographic resolution

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

• Listed as Lower to Middle Cambrian; Glossopleura zone

• bed-level stratigraphic resolution

Environment/lithology: platform or shelf-margin reef; poorly lithified, gray, silty shale

• Briggs and Robison (1984) notes that the fauna includes a mixture of typically deeper and shallower species since the carbonate bank was poorly developed during this time and there was little barrier to intermingling; 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)
• Hard, medium-dark gray, flaggy parting, noncalcareous mudshale

Size classes: macrofossils, mesofossils

Preservation: soft parts

Primary reference: D. E. G. Briggs and R. A. Robison. 1984. Exceptionally preserved nontrilobite arthropods and Anomalocaris from the Middle Cambrian of Utah. University of Kansas Paleontological Contributions 111:1-23 [P. Novack-Gottshall/P. Hearn/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 77218: authorized by Phil Novack-Gottshall, entered by Paul Hearn on 02.01.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• Glossopleura, Oryctocephalus, and Peronopsis bonnerensis zones; loc. 781 bears most of the fauna
Show authors, comments, and common names
Marpolia
  -
Marpolia sp.
Marpolia sp. Walcott 1919
Morania fragmenta
  -
Morania fragmenta
Morania fragmenta Walcott 1919
Yuknessia simplex
  -
Yuknessia simplex
Yuknessia simplex Walcott 1919
Bryopsidophyceae
 Caulerpales - Caulerpaceae
Margaretia dorus
Margaretia dorus Walcott 1931
Ctenocystoidea
 Ctenocystoida - Ctenocystidae
Ctenocystis utahensis
Ctenocystis utahensis Robison and Sprinkle 1969
 Bilateria - Eldoniidae
Eldonia ludwigi
Eldonia ludwigi Walcott 1911
Tergomya
 Scenelloidea - Scenellidae
Scenella radians
 Sachitida -
Wiwaxia corrugata
Wiwaxia corrugata Matthew 1899
Rhynchonellata
 Orthida - Bohemiellidae
Wimanella sp.
Wimanella sp. Walcott 1908
Hyolitha
 Hyolithida - Hyolithidae
Hyolithes comptus, "Hyolithes idahoensis" = Haplophrentis carinatus, Haplophrentis reesei
"Hyolithes idahoensis" = Haplophrentis carinatus Matthew 1899
Haplophrentis reesei Babcock and Robison 1988
Bilateria
 Luolishaniida - Teratopodidae
Acinocricus stichus
Acinocricus stichus Conway-Morris and Robison 1988
unclassified
  -
Arthropoda indet.
Arthropoda indet. Latreille 1829
Utahcaris orion
  -
Utahcaris orion
Utahcaris orion Conway Morris and Robison 1988
 Radiodonta - Anomalocarididae
Anomalocaris nathorsti
Megacheira
 Leanchoiliida - Leanchoiliidae
Leanchoilia hanceyi
Leanchoilia hanceyi Briggs and Robison 1984
Deuteropoda
 Hymenostraca -
Branchiocaris pretiosa
Malacostraca
 Phyllocarida -
Dioxycaris argenta
Crustacea
 Canadaspidida - Canadaspididae
Canadaspis cf. perfecta
 Tuzoida - Tuzoiidae
Tuzoia retifera
Tuzoia retifera Walcott 1912
Palaeoscolecida
 Cricocosmida - Palaeoscolecidae
"Palaeoscolex ratcliffei" = Wronascolex ratcliffei
"Palaeoscolex ratcliffei" = Wronascolex ratcliffei García-Bellido et al. 2013
 Archaeopriapulida - Selkirkiidae
Selkirkia spencei, Selkirkia cf. columbia
Selkirkia cf. columbia Conway Morris 1977
Hexactinellida
 Reticulosa - Protospongiidae
Brooksella sp.
Brooksella sp. Bassler 1941 glass sponge
Demospongiae
  - Vauxiidae
Vauxia gracilenta, Vauxia magna
Vauxia gracilenta Walcott 1920 demosponge
Vauxia magna Rigby 1980 demosponge
Canadia
  - Canadidae
Canadia sp.
Canadia sp. Walcott 1911