|Name||Pyroxenite and syenite|
|Geologic age||Tertiary or Cretaceous|
Igneous > Plutonic > Syenitic > Syenite
Igneous > Plutonic > Ultramafic > Pyroxenite
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.