Glaciological Literature

Abstract

A new description of the classical section in glacial deposits at the Bay of Nigg South Cliff enables significant comparisons to be made with the Tullos sections. The combined evidence from the 'two localitie~ makes possible certain deductions about the succession of glacid events. It is shown that the fine-grained sediments of Tullos are contemporaneous with the melting of the "second" ice sheet of northeast Scotland. At this time sea-level was about 80 ft. (24 m .) higper than at present. Evidence is given which indicates that the morainic gravels on the high ground flanking the Tullos d epression were also a product of the melting of the "second" ice sheet. This is at variance with Bremner's view that these gravels belong to the "third" ice sheet. It is pointed out that the variation in composition of the Nigg Bay boulder day does n ot justify the postulation of two ice sheets for its formation .