dropstone


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dropstone

(ˈdrɒpˌstəʊn)
n
1. (Geological Science) obsolete an old name for stalactites
2. geology an isolated rock fragment deposited in sedimentary rock through the water column
References in periodicals archive ?
I encountered a beautifully preserved Ordovician Rugosa coral dropstone in a core that couldn't be more than 3 million years old, thin beds of bright blue and purple clays, and black minerals that faded as I tried to describe them.
Boulders of baksteenkalk, on the other hand, are dropstones which fell from melting ice floes associated with the river system known as the 'Baltischer Urstrom' or the Eridanos (Rhebergen et al.
The cobbles present within the thickest part of the peat (area of Section A) may be dropstones derived from ice-rafting (C.
Some conglomeratic and shale levels with out-sized clasts are interpreted as dropstones.
When he presented a paper in 1963 on a "Great Infra-Cambrian Glaciation" he was shot down by critics who interpreted his glacial dropstones as products of marine mudslides.
They lack graded beds and coarse silt and sand strata that often characterize glacial lake sediments (varves) and have a low percentage of dropstones.
Dropstones include large rocks freed from icebergs as they melt.
Scientists have found similar dropstones in Cretaceous deposits from the Northern Hemisphere, and the rocks also are found in sediments from other warm periods.