ammonites

Langston Formation

Geology

Members: unnamed (2), Lead Bell Shale (Spence Shale) (1), Naomi Peak Limestone (1), Spence Shale (4)

Lithologies: mudstone (3), "shale" (3), "limestone" (4)

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

Age range: Menevian to Merioneth or 513.0 to 490.0 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Middle Cambrian513.0 - 501.0USA (Utah) (80121 80122)
Menevian513.0 - 501.0USA (Idaho) (50208 50218)
Delamaran513.0 - 501.0USA (Idaho) (207 90621)
Delamaran513.0 - 501.0USA (Utah) (90588)
Merioneth501.0 - 490.0USA (Idaho) (198)