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TitleDownhole geophysical logs in Quaternary sediments of central Simcoe County, southern Ontario
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorCrow, H LORCID logo; Olson, L C; Mulligan, R P M; Cartwright, T J; Pugin, A J -M
SourceGeological Survey of Canada, Open File 8251, 2017, 24 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatreadme
File formatpdf; docx; las
NTS31D/04; 31D/05; 31D/12; 41A/01; 41A/08; 41A/09
AreaLake Simcoe; Georgian Bay; Barrie
Lat/Long WENS -80.2500 -79.5000 44.7500 44.0000
Subjectsgeophysics; hydrogeology; surficial geology/geomorphology; stratigraphy; groundwater; groundwater resources; aquifers; boreholes; geophysical logging; gamma ray logging; electromagnetic induction; conductivity; magnetic susceptibility; temperature; anomalies; hydrostratigraphic units; postglacial deposits; glacial deposits; moraines; tills; glaciofluvial deposits; glaciolacustrine deposits; glacial lakes; organic deposits; sands; muds; silts; clays; gravels; heavy minerals; sediment transport; groundwater flow; groundwater movement; Glacial Lake Algonquin; Newmarket Till; Thorncliffe Formation; Laurentian Channel; Phanerozoic; Cenozoic; Quaternary; Paleozoic
Illustrationslocation maps; geoscientific sketch maps; tables; photographs; geophysical logs; lithologic sections; profiles
ProgramGroundwater Geoscience Aquifer Assessment & support to mapping
Released2017 07 12
Summary(Plain Language Summary, not published)
The Ontario Geological Survey (OGS) is conducting a three-dimensional (3D) Quaternary sediment mapping project in central Simcoe County as part of their provincial groundwater mapping initiative. The Geological Survey of Canada (GSC) is collaborating in this work through its regional Southern Ontario Groundwater Project. Borehole geophysical logs were acquired in 6 PVC cased boreholes (30 - 140 m) by the GSC to better understand the in situ physical and chemical properties of the sediments, and their lateral variability across the study area. Natural gamma and induction logs were acquired to investigate lithological variation within the sediments. Downhole seismic logs were collected using the GSC's Minivib source to investigate material velocities, and verify the conversion of seismic reflection time sections into depth sections. High-resolution fluid logs were recorded to identify temperature changes within each borehole, and regional groundwater trends across the study area. Figures of the log suites and digital log data are provided in appendices.

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