In Western Newfoundland, erosion surfaces are recognised at the following elevations: 2350-2500', 2100-2300', 1900-2150', 1750- 1900', 1550-1700', 1250-1500', 1100-1350', 1000-1150', 850-1000' and 750-850'. Surfaces below 750' were not investigated. All are considered to be of subaerial origin. By inductive reasoning, based on a recent hypothesis of the evolution of the continental margin of eastern North America, it is tentatively concluded that the group of surfaces above 2000' developed during a Cretaceous - early Cenozoic erosion cycle, and that lower surfaces are of later Cenozoic age. Uplift occurred at the beginning of the Cretaceous, in the mid Cenozoic and in the late Cenozoic. Small vertical intervals between the surfaces are tentatively attributed to periodic positive isostatic responses of the earth's crust to the relief of load by denudation since at least the beginning of the Cretaceous.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.115366 |
| Date | January 1964 |
| Creators | Brookes, Ian. A. |
| Contributors | Summers, W. (Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science. (Department of Geography.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: NNNNNNNNN, Theses scanned by McGill Library. |
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