Video Transcript
What clastic deposit has a grain
size of 62 micrometers to two millimeters?
Clastic deposits are described
according to their composition and texture. This question relates to texture,
more specifically grain size or clast size. We need to recall the name of a
sedimentary rock that contains grains with diameters from 62 micrometers to two
millimeters. One micrometer is equal to one
micron or one thousandth of a millimeter.
Let’s examine the three main
clastic deposits: mud deposits, sand deposits, and gravel deposits. Mud deposits are composed of a
mixture of grains that have a grain size less than 62 microns. When mud deposits become lithified,
shale or laminated mud is formed. Sand deposits are composed of
grains ranging from 62 microns to two millimeters in diameter. When sand deposits become
lithified, sandstone is formed. Gravel deposits consist of rounded
fragments that are more than two millimeters in diameter. When gravel deposits become
lithified, conglomerates and breccias are formed.
From this information, we can see
that sandstone is the clastic deposit that has a grain size of 62 micrometers to two
millimeters.
