The GeologyOntario (includes OGSEarth) web pages will be updated with a new look in the coming weeks, starting at the end of September 2021.
The updated design improves the user experience by simplifying the layout, making the pages more mobile compatible, and aligning with other Ministry web pages.
Please contact Alphons Evers (alphons.evers@ontario.ca) if you encounter any issues after the change or have any questions.
During this update, this page will be removed. Please update your bookmark to the following: Rhyolite Occurrences.
Rhyolite contains a layer which depicts the location and composition of various rhyolite occurrences across northern Ontario.
Data includes: approximate location, physical character, age and the chemical nature of each rhyolite occurrence.
Download the Northeastern Ontario Rhyolite Database in GIS format.
Download the Northwestern Ontario and Grenville Province Rhyolite Database in GIS format.