John A Donaldson - Academia.edu (original) (raw)

John Allan Donaldson, BSc, Queen’s Univ, 1956

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In the Ogilvie Mountains, west-central Yukon, the upper Proterozoic lower Mount Harper group (inf... more In the Ogilvie Mountains, west-central Yukon, the upper Proterozoic lower Mount Harper group (informal name) is stratigraphically equivalent to basal Windermere Supergroup rocks that occur in other areas of the North American Cordillera. Breccias at the base of the lower Mount Harper group are of two different, but in part coeval, origins. A normal fault that was active during late Proterozoic time forms the southern boundary of the lower Mount Harper group and is genetically related to a wedge of paleotalus breccia that thins rapidly northward from the fault. A different breccia layer is preserved on a disconformity surface that separates lower Harper group strata from a thick succession of underlying dolostones. This disconformity breccia contains silcretes and calcretes that provide evidence of several episodes of subaerial exposure. Rare interbedded debris flows display features that suggest coincidence of the last exposure event with initiation of deposition of the Mount Harper...

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Canadian Inland Seas

Publisher Summary Hudson Bay, James Bay, and Foxe Basin occupy depressions in the central part of... more Publisher Summary Hudson Bay, James Bay, and Foxe Basin occupy depressions in the central part of the Canadian Shield that constitutes the Precambrian crustal nucleus of North America. On the basis of structural style and radiometrically determined ages, the Canadian Shield is subdivided into seven distinctive tectonic provinces. The largest of these, the Superior and Churchill Provinces, surround and underlie Paleozoic and Mesozoic strata that occupy substantial areas beneath and adjacent to James Bay and Hudson Bay. The rocks of the Superior Province form much of the eastern shoreline of James Bay and Hudson Bay and those of the younger Churchill Province form the shorelines on sides of northern Hudson Bay, the northeastern shoreline of Southampton Island, and all of the Precambrian shoreline around Foxe Basin. The Belcher islands, Ottawa islands, and most other islands in the eastern part of Hudson Bay, as well as a few small near-0shore islands in Foxe Basin, belong to the Churchill Province.

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Canadian Inland Seas

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