Spence Shale

The Spence Shale is the middle member of the Langston Formation in southeastern Idaho and northeastern Utah. It is exposed in the Bear River Range, the Wasatch Range and the Wellsville Mountains. It is known for its abundant Cambrian trilobites and the preservation of Burgess Shale-type fossils.

The type locality is Spence Gulch in southeastern Idaho, near the town of Liberty. It was first described by Charles Doolittle Walcott in 1908.

Stratigraphy
The Spence Shale spans the Albertella and Glossopleura biozones.

Fauna
Generic list of the fauna of the Spence Shale:

Soft-bodied

 * Anomalocaris
 * Canadaspis
 * Caryosyntrips
 * Dioxycaris
 * Hurdia
 * Isoxys
 * Leanchoilia
 * Meristosoma
 * Mollisonia
 * Sidneyia
 * Tuzoia
 * Utahcaris
 * Waptia
 * Yohoia

Agnostida

 * Pentagnostus
 * Ptychagnostus

Trilobita

 * Alokistocare
 * Alokistocarella
 * Amecephalus
 * Athabaskia
 * Bathyuriscus
 * Bythicheilus
 * Chancia
 * Ehmaniella
 * Glossopleura
 * Kochina
 * Kootenia
 * Ogygopsis
 * Olenoides
 * Oryctocara
 * Oryctocephalites
 * Oryctocephalus
 * Pagetia
 * Piochaspis
 * Polypleuraspis
 * Ptychoparella
 * Solenopleura
 * Syspacephalus
 * Thoracocare
 * Utia
 * Zacanthoides

Brachiopoda

 * Acrothele
 * Dictyonina
 * Diraphora
 * Lingulella
 * Micromitra?
 * Wimanella

Mollusca

 * Latouchella
 * Scenella
 * Wiwaxia

Lophotrochozoa

 * Haplophrentis
 * Hyolithellus
 * Hyolithes

Echinodermata

 * Ctenocystis
 * Gogia
 * Lyracystis
 * Ponticulocarpus
 * Totiglobus

Hemichordata

 * Margaretia
 * Sphenoecium

Priapulida

 * Ottoia
 * Selkirkia
 * Wronascolex?

Lobopodia

 * Acinocricus
 * Hallucigenia

Porifera

 * Brooksella?
 * Protospongia
 * Vauxia

Problematica

 * Banffia
 * Eldonia
 * Siphusauctum

Algae

 * Marpolia

Cyanobacteria

 * Morania

Trace Fossils

 * Archaeonassa
 * Arenicolites
 * Aulichnites
 * Bergaueria
 * Chloephycus
 * Conichnus
 * Coprolite
 * Cruziana
 * Dimorphichnus
 * Diplichnites
 * Gordia
 * Gyrophyllites
 * Halopoa
 * Lockeia
 * Monomorphichnus
 * Nereites
 * Phycodes
 * Phycosiphon
 * Planolites
 * Protovirgularia
 * Rusophycus
 * Sagittichnus
 * Scolicia
 * Taenidium
 * Teichichnus
 * Tomaculum
 * Treptichnus
 * Trichophycus