Location. The McMurdo Creek Lead-Silver Property is about 150 miles north of the International Boundary, and lies on the watershed of the Purcell range. Stratigraphy. The Property is underlain by rocks tentatively correlated with the Windermere system, (Proterozoic). A threefold division is made of the conformable sediments studied by the writer: (1) the Lower Division, 2,000 feet thick, (slate, with quartzite and minor thin-bedded limestone); (2) the Middle Division, 1,000 feet thick, (quartzite with thin slate bands); (3) the Upper Division, 1,000 feet thick, (slate and quartzite. Structure 1. Folding. The Property lies mostly on the crest and southwest limb of a major non-plunging anticline with northwest strike. The southwest limb, in general the more gently dipping, has a zone one-half mile wide near the crest of the anticline that has, besides normal drag-folds, minor S-shaped folds in the competent members that do not have the normal dragfold form, (fig. 5, p. l4). The S-shaped folds were produced by tectonic transport of the members of tbe Lower Division up the northeast limb. In that division, competent and incompetent members on that limb were thinned by slippage on flow-cleavage surfaces originally probably sub-parallel to the axial plane of the major anticline, but later rotated so that the cleavages in the less competent members are parallel to the bedding or nearly so.[...]
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.119040 |
| Date | January 1952 |
| Creators | Simpson, David Hope. |
| Contributors | Gill, J. (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 | Doctor of Philosophy. (Department of Geological Sciences. ) |
| 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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