Tokio Formation

Tokio Formation
State Arkansas
Name Tokio Formation
Geologic age Late Cretaceous
Lithologic constituents
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Chemical > Novaculite (Bed)
Sedimentary > Coal (Bed)
Comments Intertouging beds of gray clay and qtz. sand with some lignite and basal novaculite gravels. Approximatly 300 ft. thick. Novaculite-similar to chert but characterized by dominance of microcrystalline quartz over chalcedony.

Dane, C.H.,1929, Upper Cretaceous formations of southwestern Arkansas: Arkansas Geol. Survey Bull.1, 215 pp.

NGMDB product
Counties Clark - Hempstead - Howard - Little River - Pike - Sevier