dropstone

== English == === Etymology === From 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); an erratic. ==== Synonyms ==== (glaciology): erratic ==== See also ==== lonestone