Middle Maudlow Formation

Grayish red and grayish green lava flows, varicolored tuff, and bluish green and dark yellowish brown volcanic breccia, tuffaceous volcanic sandstone, mudstone, and minor conglomerate.
State Montana
Name Middle Maudlow Formation
Geologic age Cretaceous
Lithologic constituents
Sedimentary > Clastic > Mudstone (Bed)
Sedimentary > Clastic > Sandstone (Tuffaceous)
Igneous > Volcanic (Flow, Volcaniclastic-volcanic breccia, Pyroclastic-tuff)
Sedimentary > Clastic > Conglomerate (Bed)

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 Gallatin