A(n) ______ is sandstone in which more than 15% of the rock's volume consists of fine-grained matrix.
A) quartz sandstone
B) quartzite
C) graywacke
D) oolitic limestone
E) arkose

Question

Quizplus · Accepted Answer

Graywacke is a type of sandstone that contains more than 15% of fine-grained matrix, which is usually composed of clay or other minerals. This matrix gives graywacke its characteristic dark gray color and often makes it harder than other sandstones.

A(n) ______ Is Sandstone in Which More Than 15% of the Rock's