One of the mysteries of the English language finally explained.
Formed or consisting of fragments of pre-existing rock produced by processes occurring on the earth's surface, such as erosion or weathering; (also) designating the structure of a rock formed in this way. Contrasted with autoclastic, "cataclastic", "pyroclastic".
Late 19th century. From epi- + clastic. Compare earlier pyroclastic, and also cataclastic.
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