The Port Askaig Formation in Argyll: uncovering the evidence for repeated climatic changes in a Cryogenian glacial sequence
The Port Askaig Formation (PAF) in the Garvellach Islands and Islay is ~1100m thick and includes 47 diamictites. Many were deposited by grounded ice; a few were ice-rafted. The PAF records 76 climatically-related episodes: 28 glacial, 25 periglacial and 23 non-glacial. Amongst Cryogenian glacial successions, the PAF is exceptional in its combination of: formation thickness; the number of climatically-related episodes; the thickness (25km) of its host Supergroup. PAF studies started with MacCulloch (1819); Thomson (1871) proposed a glacial origin; Pitcher and Shackleton (1961) measured the strata in the Garvellachs, leading to my 1971 Memoir; a large team is now preparing a new Memoir.
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