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Clastic Sediments in Castleguard Cave, Columbia Icefields, Alberta, Canada
J. Schroeder and D. C. Ford
Arctic and Alpine Research
Vol. 15, No. 4, Castleguard Cave and Karst, Columbia Icefields Area, Rocky Mountains of Canada: A Symposium (Nov., 1983), pp. 451-461
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1551232
Page Count: 11
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Castleguard Cave contains a variety of clastic sediments of both allochthonous and autochthonous origin. The head of the cave, lying beneath the Columbia Icefield, displays breakdown and glaciofluvial injecta that are ancient. Principal deposits in the central cave are the eroded remains of at least three phases of silt filling. These are interpreted as varved sequences deposited under full glacial conditions. They are older than 140,000 BP. A channel abandonment facies occupies the inner part of the downstream entrance complex. The outer part is prone to flooding today and contains a remarkable shingle beach formed in situ where floodwaters must rise vertically.