Younger granitic intrusion (TXpCAy;0)

State	Texas
Name	Younger granitic intrusion
Geologic age	preCambrian-Proterozoic
Original map label	pCy
Comments	Oatman Creek Granite appears to be late differentiate of Town Mountain Granite Younger granitic intrusions include aplogranite bodies and aplite dikes, pegmatite dikes, quartz masses
Primary rock type	granite
Secondary rock type	aplite
Other rock types	pegmatite
Lithologic constituents	Major Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-felsic-alkaline (Dike or sill)Sixmile Granite, uniform fine-grained, commonly gray, but variable color, quartz-plagioclase-microcline rock, occurs as irregular intrusive bodies penetrating metamorphic rocks and Town Mountain Granite Igneous > Hypabyssal > Felsic-hypabyssal > Hypabyssal-felsic-alkaline (Dike or sill)fine-grained, pink, mildly cataclastic, quartz-plagioclase-microclinerock, occurs in irregular bodies of about 1 mile in size and in elongate en echelon dikes or sills
Map references	Bureau of Economic Geology, 1992, Geologic Map of Texas: University of Texas at Austin, Virgil E. Barnes, project supervisor, Hartmann, B.M. and Scranton, D.F., cartography, scale 1:500,000
Unit references	Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
Geographic coverage	Blanco - Gillespie - Llano - Mason - San Saba