|Name||Mafic igneous rocks|
|Geologic age||preCambrian (Proterozoic)|
Igneous > Plutonic > Gabbroic (Stock or pipe)metagabbro in stock or laccolith
Igneous > Plutonic > Dioritic (Laccolith)also metadiorite
Metamorphic > Amphibolite (Amphibolite)hornblendite
|Comments||Chiefly diorite, hornblendite, metagabbro, and metadiorite; occurs as linear to equidimensional bodies chiefly in SE part of Llano region (from Llano Sheet of Geologic Atlas of Texas, 1981)|
Bureau of Economic Geology, 1981, Llano sheet, Geologic Atlas of Texas, Bureau of Economic Geology, University of Texas at Austin, scale 1:250,000.
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.
|Counties||Gillespie - Llano|