P1000742
"Andesite and diorite brecciate each other, and sharp contacts can be seen between two, or even three or four, dioritic facies, as more acidic facies are usually lighter in color. Usually more acidic facies include blocks of more basic diorite, but the more basic varieties may also include lighter types." D,H. Eggler, 1968. Virginia Dale Precambrian Ring-Dike Complex, Colorado-Wyoming
P1000742
"Andesite and diorite brecciate each other, and sharp contacts can be seen between two, or even three or four, dioritic facies, as more acidic facies are usually lighter in color. Usually more acidic facies include blocks of more basic diorite, but the more basic varieties may also include lighter types." D,H. Eggler, 1968. Virginia Dale Precambrian Ring-Dike Complex, Colorado-Wyoming