dropstone

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dropstone

[′dräp‚stōn]
(geology)
A rock that was carried by a glacier or iceberg, and deposited as the ice melted.
References in periodicals archive ?
2001; Evans, 2003; Iverson and Iverson, 2001; Powell, 2003) cannot be ruled out because of the presence of dropstones, synsedimentary large-scale deformation and hyperpicnic flow deposits, According to Amenabar and Di Pasquo (2008), these materials accumulated during the Lower Carboniferous.
Shale and sandstone layers are distorted by some dropstones locally (Fig.
A lack of seasonal lamination and the presence of ice-rain deposits with dropstones suggest that the WGD was mostly deposited by subaquatic basal meltout and the massive fine-grained sediment settled as suspension fall-out (Fig.
However, few dropstones ([less than or equal to] 6 cm in diameter) of crystalline rocks were found in these sediments.
Nevertheless, occasional dropstones in the clay rhythmites of SU1 indicate that deposition from the bottom of the glacier which ran over or floated above the deep valley at Arumetsa may have taken place during Late Saalian time.
1999a), most of Unit 1 likely consists of silty mud with scattered angular grit and dropstones, and was deposited by meltwater plumes and icebergs emanating from Late Wisconsinan ice.
The delta sediments have rare dropstones, suggesting that the ice was not in contact with the sea at the basin margin (Batterson et al.
The core raised from the East Greenland shelf (HU93-19) consists of gray, silty clay with few, small dropstones, minor bioturbation at the core top, and sand-filled burrows scattered throughout the core.