This thesis describes and interprets the glacial sediments mapped in the area of East Aberdeenshire that is included within the boundaries of Sheet 77 of the one inch to the mile geological map of Scotland, The dominant glacial sediment recorded is a grey brown till deposited from ice which moved in an eastward direction across the area. The composition of the clasts and matrix of this till is a reflection of the bedrock geology immediately underlying it. Near the coast, and in the northeast quadrant of the Sheet 77 area, this local till is succeeded by a red coloured till which was deposited from ice which moved northwards along the coast, The composition of this till is related to sediments found offshore and to the south of Sheet 77. Fluvioglacial sediments are found in association with both till deposits, being concentrated in the Dee and Don river valleys and in the coastal zone. Minor glaciolacustrine deposits, primarily associated with the red till also occur. It is deduced that most of the till was deposited by meltout and flow processes during deglaciation. Only one instance of a lodgement till has been recorded. This interpretation is strengthened by the common association of both tills with meltwater sediments which were deposited during deglaciation when large masses of stagnant ice disintegrated and melted in situ. By correlation with areas outside of Sheet 77, the glacial sediments are interpreted as having been deposited during the Late Weichselian stadial which began some 23,000 years b,p. with the area probably becoming ice free before 13,000 years b.p, The area has not been covered by ice since this time.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:483870 |
| Date | January 1977 |
| Creators | McLean, Forbes |
| Publisher | University of Aberdeen |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602214 |
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