Latitic Intrusive Rocks (SDTl;0)

Dark-gray to greenish-gray laccoliths and sills of latite, latitic andesite, and quartz latite. Contains phenocrysts of andesine, oligoclase, biotite, hornblend, and sphene in a finely crystalline andesine-biotite-quartz groundmass.

State	South Dakota
Name	Latitic Intrusive Rocks
Geologic age	Phanerozoic \| Cenozoic \| Tertiary \| Paleocene Eocene
Original map label	Tl
Primary rock type	latite
Secondary rock type	andesite
Other rock types
Lithologic constituents
Map references	Martin, J. E., Sawyer, J. F., Fahrenbach, M. D., Tomhave, D. W., and Schulz, L. D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey
Unit references	Martin, J. E., Sawyer, J. F., Fahrenbach, M. D., Tomhave, D. W., and Schulz, L. D., 2004, Geologic Map of South Dakota: South Dakota Geological Survey
Geographic coverage	Lawrence - Meade