Ice wedge casts in the Dalradian of South Donegal; evidence for subaerial exposure of the Boulder bed

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Authors:Johnston, J. D.
Author Affiliations:Primary:
Trinity College, Department of Geology, Dublin, Ireland
Volume Title:Irish Journal of Earth Sciences
Source:Irish Journal of Earth Sciences, Vol.12, p.13-26. Publisher: Royal Irish Academy, Dublin, Ireland. ISSN: 0790-1763
Publication Date:1993
Note:In English. 25 refs.; illus. incl. 1 table, geol. sketch map
Summary:This boulder bed is a widespread diamictite. Previously described 'clastic polygons' in bedding planes at the top of the bed are wedge-shaped clastic dykes filled with arenite and clasts of vein quartz, 'blue' quartz, quartzite, semipelites and granite. The fabrics are evidence of an origin of the polygons as ice-wedge clasts. [R.K.H.]
Subjects:Clastic dikes; Clastic rocks; Correlation; Dalradian; Diamictite; Glacial features; Lithostratigraphy; Paleozoic; Sedimentary rocks; Sedimentary structures; Soft sediment deformation; Donegal Ireland; Europe; Ireland; Western Europe; Clastic polygons; Port Askaig Tillite Formation; Strain ellipsoid
Abstract Numbers:96M/2372
Record ID:1994017846
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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