Purcell Lava

Black to blackish green alkaline basalt flows.
State Montana
Name Purcell Lava
Geologic age Middle Proterozoic
Lithologic constituents
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Comments Changed unit symbol from Ypl to Ypur; cannot have 2 units with the same symbol Ypl (Lower Prichard Formation).

Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract between the U.S. Geological Survey and the Montana Bureau of Mines and Geology.

NGMDB product
Counties Lincoln