stripes
Numerous laccoliths and other igneous intrusions have domed and warped both Precambrian crystalline rocks and sedimentary rocks in the central Little Belt Mountains. A broad range of rock types is present from rhyolite and granite porphyries through latites and syenite to shonkinites and lamprophyres. Few of these rocks are peralkaline but a little analcime and other zeolites occur in some syenites and possible sodalite has been identified (Witkind, 1973, Table 4).
MARVIN, R.F., WITKIND, I.J., KEEFER, W.R. and MEHNERT, H.H. 1973. Radiometric ages of intrusive rocks in the Little Belt Mountains, Montana. Bulletin of the Geological Society of America, 84: 1977-86.
WITKIND, I.J. 1973. Igneous rocks and related mineral deposits of the Barker Quadrangle, Little Belt Mountains, Montana. Professional Paper, United States Geological Survey, 752: 1-58