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Sedimentary deposits with smaller group sizes in sedimentary rocks are found in clastic sedimentary rocks
Clastic sedimentary rock
Clastic sedimentary rock is composed of rock fragments (clasts) that have been cemented together. These classes are typically grains of quartz, feldspar, clay minerals, or mica. However, all types of minerals may be present. A class can also be a lithic fragment consisting of more than one mineral.
Clastic sedimentary rocks are divided based on the dominant particle size. Most geologists use the Udden-Wentworth grain size scale and divide unconsolidated sediment into three fractions: gravel (>2 mm diameter), sand (1/16 to 2 mm diameter), and silt (<1/16 mm diameter) . Silts are further divided into silts (1/16 to 1/256 mm in diameter) and clays (<1/256 mm in diameter). Classification of clastic sedimentary rocks according to this scheme; Conglomerates and breccias are mostly made of gravel, sandstones are mostly made of sand, and mudstones are mostly made of silt.
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