dropstone

English

Etymology

drop +‎ stone

Noun

dropstone (plural dropstones)

(geology) An isolated fragment of rock found within a sedimentary rock (that had fallen, rather than being carried along)
(glaciology) An isolated rock that is geologically distinct from the surroundings indicating that it was carried from a distant area and then dropped in place (by a melting glacier)

Synonyms

(glaciology): erratic

See also

lonestone

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