Publications Release Notice — October 16, 2019

Mines and Minerals Division: 

The following publications are being released on October 16, 2019, at 10:00 a.m. Eastern Time, or 9:00 a.m. Central Time, unless otherwise indicated. To automatically receive the Publications Release Notice by email, subscribe to the distribution list by contacting Publication Sales.

Maps and reports in hard-copy (paper) format and digital data sets available on physical media CD or DVD) can be purchased from the Publication Sales office. Publications can be downloaded for free from the GeologyOntario application or by following the links provided in this release notice. In cases where the file size is prohibitive for downloading, please contact the Publication Sales office to obtain the data on physical media (CD for $20.00; DVD for $25.00).

The digital data provided with maps as downloadable zip files from GeologyOntario contain additional information that supplements the cartographic information, and is provided at the discretion of the author(s).

Prices listed in this Release Notice apply to hard-copy versions only and are subject to change without notice. The prices given in a particular release notice are guaranteed only for a period of 1 month following the date of the release.

Earth Resources and Geoscience Mapping Section

Precambrian Geology – Northeastern Ontario

Preliminary Map P.3827
Precambrian Geology of Marion and Mallard Townships and Part of Genoa Township, Southeastern Swayze Area, Abitibi Greenstone Belt, Northeastern Ontario; by T.P. Gemmell, N. Szumylo and A.B. Mowbray, scale 1:20 000, colour. $15.30

Groundwater Studies

Groundwater Resources Study 18
Three-Dimensional Mapping of Surficial Deposits in the Southern Part of the County of Simcoe, South-Central Ontario; by A.F. Bajc, R.P.M. Mulligan and J.E.P. Dodge. This digital data release contains information regarding the three-dimensional distribution and character of surficial materials that may form groundwater aquifers and aquitards within the southern part of the County of Simcoe, south-central Ontario. Data include 1) a summary report (.pdf); 2) ESRI® ArcInfo® grids and comma-delimited (.csv) files of modelled surfaces; 3) Google Earth mapping service (.kml, .kmz) files depicting borehole location and stratigraphic information as well as isopach and structural contour maps of modelled units; 4) high-resolution plates (.pdf) depicting north-south and east-west cross sections and aquifer recharge and vulnerability maps; and 5) an abbreviated version of the subsurface data (.mdb) used for the construction of the three-dimensional block model, which includes borehole collar and stratigraphic information, picks data, and screen depth and water level information. This study is available on 1 DVD. $25.00.


Miscellaneous Release—Data 273–Revision 2
Ontario Precambrian Bedrock Magnetic Susceptibility Geodatabase for 2001 to 2017; compiled by S. Biswas. This digital release updates previously published data, MRD 273—Revised (in 2013), with the addition of 21 420 magnetic susceptibility measurements acquired in 18 new geological mapping projects conducted between 2013 and 2017 (inclusive) by the Earth Resources and Geoscience Mapping Section of the Ontario Geological Survey. The merged data set now contains 50 225 sets of outcrop readings obtained between 2001 and 2017 from 64 projects and which are presented in ESRI® ArcMap document (.mxd), geodatabase (.gdb) and shapefile (.shp) formats and a comma delimited (.csv) file. Provincial-scale base (map) data for the province boundary (.gdb), drainage (.gdb) and township or area outlines (.shp) are also included. A report describing the instrumentation, data acquisition, processing and sources, and data usage is included as a portable document format (.pdf) file. A template for field data collection, as a macro-enabled spreadsheet, Microsoft® Excel® 2016 (.xlsm), is also provided. The data are available on 1 CD. $20.00


Geochronology Inventory of Ontario—2019 (GeochrON–2019)
The Geochronology Inventory of Ontario—2019 (or GeochrON—2019) is a compilation of the geochronology information for Ontario and for adjacent jurisdictions with similar geology. The Geochronology Inventory (GeochrON) provides an overview of isotopic ages obtained from rock samples from the province of Ontario and contains information on age, error, methods, rock type, sample number, location, geological environment, and the source of the information. It is based on data acquired by the Ontario Geological Survey (OGS) as part of its geological mapping program, data from Geological Survey of Canada publications, and data compiled from the scientific literature from 1932 to 2019. It is intended that this compilation will be updated annually.

The Geochronology Inventory of Ontario—2019 (or GeochrON—2019) is available as a direct download from OGSEarth. The compressed ( download file provides Geochronology Inventory data in 2 formats: 1) a relational database (Microsoft® Access® 2016 (.accdb) file) and 2) geospatial (ESRI® shape file) provincial coverage. Geospatial data are provided in North American Datum 1983 (NAD83) geographic co-ordinate system using decimal degrees. A user document, a bibliography, and a readme file (that explains the content) are provided. It is important to note that this compilation is not intended to be used as a standalone product and the source reference(s) should always be consulted in conjunction with this compilation.

Note: This is the first release in this configuration and it should be considered to be a “beta” version. We welcome comments and suggestions from users regarding changes to the query criteria, report form, etc. Any errors or omissions should be brought to the attention of the Ontario Geological Survey so that they can be corrected, and included in future updates of this compilation. Contact information is provided in the readme document.


Maps 60 417 and 60 419

Geophysical Map 60 417, Airborne Magnetic Survey, Colour-Filled Contours of the Gradient-Enhanced Residual Magnetic Field, Latchford Area—Purchased Data, and Geophysical Map 60 419, Airborne Magnetic Survey, Shaded Colour Image of the Second Vertical Derivative of the Gradient-Enhanced Residual Magnetic Field and Keating Coefficients, Latchford Area—Purchased Data, (each map released on December 3, 2013), were published with an incorrect latitudinal measurement plotted at 1 corner of the map sheet: the northeastern extent is 47°12′48″N, 79°29′23″W (not 48°11′48″N, 79°29′23″W); all other measurements are correct.

These errors have been corrected and replacement maps are available. If you purchased a copy of either map and wish to receive a replacement copy, please contact Publication Sales and a replacement map will be sent to you free of charge. Alternatively, and for clients who downloaded the map from GeologyOntario, the corrected versions are available for downloading at Geophysical Map 60 417 and Geophysical Map 60 419.

We regret any inconvenience this error may have caused.

PDF icon Location map, October 16, 2019400.89 KB