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The Holocene
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Late-Quaternary cryostratigraphy of a coastal cliff at Martha Point, southwest Banks Island, western Canadian Arctic

Peter Worsley

Centre for Earth and Atmospheric Sciences, University of Reading, Box 227, Reading RG6 6AB, UK

A 5 m thick unlithified sequence consisting of sands, silts and minor peats crop out in a coastal cliff within continuous permafrost. A well-exposed 70 m long section displayed a range of epigenetic ice wedges. These could be classified into three generations, each at a different stratigraphic level. The oldest was truncated by a major thaw unconformity which was overlain by a bed of highly involuted silts with peat clasts, interpreted as evidence of a deep palaeoactive layer and associated thermokarst. This bed forms part of a regionally extensive thermokarst phase, correlated with an early-Holocene Climatic Optimum. The other two ice-wedge horizons postdate the thermokarst event with the youngest approximating to the base of the modern active layer.

Key Words: Permafrost • epigenetic ice wedges • involutions • thaw unconformity • palaeoactive layer • Holocene Climatic Optimum • Canadian Arctic

The Holocene, Vol. 10, No. 3, 395-400 (2000)
DOI: 10.1191/095968300675687786
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J. N. Kasper, J. N. Kasper, and M. Allard
Late-Holocene climatic changes as detected by the growth and decay of ice wedges on the southern shore of Hudson Strait, northern Quebec, Canada
The Holocene, July 1, 2001; 11(5): 563 - 577.
[Abstract] [PDF]