dropstone
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English[edit]
Etymology[edit]
Noun[edit]
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); an erratic.
Synonyms[edit]
- (glaciology): erratic