CGRG Bibliography of Canadian Geomorphology
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Author : Granger, B.
Date : 2005.
Title : Geomorphology of an exhumed Emsian paleosurface in southwestern Gaspé Peninsula, Québec.
Publication : Joint Meeting of the Geological Association of Canada, the Mineralogical Association of Canada, the Canadian Society of Petroleum Geologists and the Canadian Society of Soil Sciences. May 15-18, 2005. Studley Campus of Dalhousie University, Halifax, Nova Scotia.
Issue :
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Abstract
High-resolution seismic data acquired in 2003 at the mouth of Chaleurs Bay in the Miguasha Peninsula, have been analysed in conjunction with surface geology and the results from two deep wells drilled in 2004. The survey is located near the hinge zone of the gently dipping south flank of the Restigouche Syncline. The seismic survey imaged a flat-cut Emsian angular unconformity that truncates the Lower Devonian and Upper Silurian succession. The unconformity corresponds to an exhumed topographic surface which is partly exposed at the mouth of the bay in Northern New Brunswick, as well as an exhumed topographic surface also exposed northeast of the survey area in the Maria - Port-Daniel area. Under the Miguasha Peninsula, at the unconformity level, a major scarp (Miguasha paleo-scarp) marks the boundary between an upper planation surface to the northwest and a lower planation surface to the southeast. This paleo-scarp is exhumed on the south side of the bay in New Brunswick and can be traced northeast of the survey area where it is known as the Garin scarp. The Garin scarp marks the limit between the relatively high altitude "Gaspesian Plateau" to the northwest and a low altitude, flat-cut exhumed topographic surface to the southeast. The Emsian Unconformity has far-reaching consequences with respect to the petroleum potential of the southern part of the Gaspé Peninsula as well as for the understanding of the tectonic evolution of the Gaspé fold belt
Bibliography of Canadian Geomorphology