: Paleoclimatology: dropstone

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dropstone

Dropstones are isolated fragments of rock found within finer-grained water-deposited sedimentary rocks. They range in size from small pebbles to boulders. The critical distinguishing feature is that there is evidence that they were not transported by normal water currents, but rather dropped in vertically through the water column. A dropstone is a clast of anomalous size, and/or lithology, indicative of vertical or oblique introduction into a host sediment, either from some form of raft, or as a projectile. In recent years, dropstones have become firmly associated with deposition from icebergs and sea ice, despite the fact that other possible rafting agents are well documented in the literature. (Adapted from: https://en.wikipedia.org/wiki/Dropstone and M. R. Bennett , P. Doyle & A. E. Mather (1996). Palaeogeography, Palaeoclimatology, Palaeoecology, 121, 331-339.)

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