spec. in Geology. Composed of fragments of previously-existing rocks, etc.

Designating, relating to, or consisting of rock fragmented by volcanic action or comminuted in the process of eruption.

Geology. Consisting of broken pieces of older rocks.

= fragmentary, adj.; spec. in Geology (see quot. 1882).

Designating a structural character due to intense crushing.

Of a rock or its structure: consisting of fragments produced in situ by crushing or granulation.

applied to clastic rocks and deposits that are not carbonates.

Designating clastic rocks and deposits which are of volcanic origin. Cf. clastic, adj. a, pyroclastic, adj.