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KARST GEOMORPHOLOGY AND HYDROGEOLOGY OF THE BEAR ROCK FORMATION A REMARKABLE DOLOSTONE AND GYPSUM MEGABRECCIA IN THE CONTINUOUS PERMAFROST ZONE OF NORTHWEST TERRITORIES, CANADA Jim Hamilton and Derek Ford School of Geography and Geology, McMaster University, Hamilton, ON L8S 4K1, Canada The Bear Rock Formation (Lower-Middle Devonian) extends always found to be a dissolutional megabreccia, 120-140 m >50,000 km in subcrop under the Mackenzie Valley and the thick. Outcrops are composed of resistant pack breccias Mackenzie and Franklin Mountains in the Northwest (cliff-forming) and regressive float breccias, both consisting Territories of Canada. In its central area (64-66°N, 125 of dolomite clasts cemented by secondary calcite 1300W), it rests unconformably on 500 m or more of thick- to (dedolomite). There is also some secondary gypsum. A massive-bedded dolostones that overlie > I 00 m of salt and particularly resistant pack breccia at the top is attributed to redbeds (Middle Cambrian to Middle Silurian), and it is near-surface evaporative effects. Evidently, brecciation has overlain by 90 m or more of resistant limestones succeeded by been caused by the circulation of meteoric groundwaters, thick clastic deposits (Meijer Drees 1993). commencing in the Middle Tertiary and continuing to the present. Where it
Carbonates and Evaporites – Springer Journals
Published: Nov 26, 2009
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