If Bedrock geology were required, for the same area, a Red outline would be necessary. The Map Library has a good collection of OGS maps. These maps are produced in two series, published and preliminary. The OGS preliminary maps are also available on fiche. Index 1,2,3 .
All indexes have a legend listing the types of maps indexed in the series.
Once the map number is located on the index sheet, go to the drawer with the corresponding number and the appropriate coloured drawer label. Any number not circled on the indexes means it is not part of our collection. The Index for Quaternary Geology is Index 6 - Published Geological Maps, Southern Ontario . Locate the area on this Index sheet. The legend indicates that an area outlined in red represents a Quaternary Geology map.