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Title3D model of the Quaternary sediments in the St. Lawrence valley and adjacent regions, southern Quebec and eastern Ontario
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorParent, M; Ross, M; Howlett, D; Bédard, K
SourceGeological Survey of Canada, Open File 8832, 2021, 26 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; txt; csv (Microsoft® Excel®); shp (ESRI® ArcExplorer(TM)/ArcReader(TM)); dbf (ESRI® ArcExplorer(TM)/ArcReader(TM))
ProvinceQuebec; Ontario
NTS21E; 21K; 21L; 31B/13; 31B/14; 31B/15; 31G; 31H; 31I; 31J/01; 31J/02; 31J/03; 31J/04
AreaSt. Lawrence River; Laurentian Mountains; Ottawa; Gatineau; Montréal; Laval; Sherbrooke; Saint-Georges; St-Hyacinthe; Drummondville; Victoriaville; Trois-Rivières; St-Jérôme; Sorel; Ottawa River
Lat/Long WENS -76.0000 -69.8333 47.0000 44.9167
Subjectssurficial geology/geomorphology; stratigraphy; Nature and Environment; Science and Technology; modelling; models; overburden thickness; isopachs; sediments; sands; clays; glacial deposits; tills; glacial history; glaciation; glaciation; lithostratigraphy; chronostratigraphy; boreholes; topography; bedrock topography; St. Lawrence Lowlands; St. Lawrence Platform; Laurentian Highlands; Appalachian Uplands; Grenville Province; Appalachian Province; Collaborative research; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; geoscientific sketch maps; stratigraphic columns; 3-D models; tables
ProgramPublic Safety Geoscience Rapid Risk Assessment
Released2021 11 04
Summary(Plain Language Summary, not published)
This report, prepared in collaboration with the Department of Earth and Environmental Sciences of the University of Waterloo, provides a first comprehensive compilation of the surface and subsurface distribution of Quaternary sediments in the St. Lawrence valley and adjacent regions. This compilation is the first step required to produce a mapped assessment of terrain parameters for dynamic response to seismic shaking in the St. Lawrence Valley. The thicknesses of simplified Quaternary units within the Ottawa and St. Lawrence Valleys will be integrated into a broader geohazard assessment platform (ER2, Nastev et al., 2015) used to assess casualties and damages to the built environment for a variety of seismic shaking scenarios. This 3D model of the St. Lawrence Valley will also be used for regional groundwater modelling and will be integrated in Canada-wide 3D model of surficial geology. In this project, a three-dimensional (3D) model is constructed to map the thicknesses of various surficial sediment units. The resulting geological model is regional in scale, extending from the Ottawa Valley to the St. Lawrence Valley and with a cell resolution sufficiently small to allow detailed analyses. In the study area, there were a number of local surficial 3D models prepared for regional hydrogeological studies, most of them conducted under the supervision or co-supervision of the senior author. This report aims to incorporate these into a single continuous 3D model with the assistance of surficial geology maps, digital elevation models (DEM) and borehole data. The main objective of this paper is to present the main results of this work: a simplified 3-layer regional-scale geological model of Quaternary units overlying bedrock in the St. Lawrence Valley and adjacent regions.

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