It can be used for unconsolidated unconsolidated
modern sand and ancient ancient
sandstone. sandstone.
Two percentage percentage are used to
subdivide subdivide terrigeneous terrigeneous sandstone: sandstone:
Percentage of matrix- any clastic Percentage of matrix- any clastic
material finer than 30 microns (coarse material finer than 30 microns (coarse
silt). Other material such as cement is silt). Other material such as cement is
irrelevant. irrelevant.
Composition of sand framework Composition of sand framework
grains, quartz, feldspar, and rock grains, quartz, feldspar, and rock
fragments (lithics). fragments (lithics)