The study or collection of clastic rocks and sediments; clastic materials or rocks in general.
From 'clastic' (relating to rock fragments) used as a mass noun. This term is used in geological and sedimentological contexts to refer to the field of study.
Petroleum geologists are obsessed with clastics—most oil deposits form in sandstone and shale (clastic rocks), so understanding how these fragments were transported and deposited literally finds you oil.
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