A graywacke is_______ .
A)a sandstone with the sand grains embedded in a clay- rich matrix
B)a dark, organic- rich, chemical sedimentary rock containing small crystals of halite
C)a dark- gray, calcite- rich mudstone or shale containing pyrite
D)a limestone with abundant, sand- sized, quartz grains

Question

Quizplus · Accepted Answer

A graywacke is a type of sandstone that has sand grains embedded in a clay-rich matrix. It is typically dark gray in color and has a gritty texture. This type of rock is commonly found in areas where there has been significant tectonic activity and is often associated with submarine fans and turbidites.

A Graywacke Is_______