Spence Shale Member

Geology

Formation: Langston

Lithologies: mudstone (3), "shale" (3), "limestone" (1)

Paleoenvironments: marine indet. (2), deep subtidal ramp (3), deep subtidal shelf (1)

Age range: base of the Wuliuan to the top of the Steptoean or 509.00000 to 493.50000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Delamaran511.2 - 506.5USA (Utah) (8946 90588)
Delamaran511.2 - 506.5USA (Idaho) (207 200479)
Wuliuan509.0 - 504.5USA (Idaho) (236011)
Middle Cambrian509.0 - 497.0USA (Utah) (80121 80122 232928)
Middle Cambrian509.0 - 497.0USA (Idaho) (68909)
Steptoean497.0 - 493.5USA (Utah) (216945)