Saturday, 4 March 2017

Ebenezer Emmons’, Sir William E. Logan’s, Professor Amadeus W. Grabau’s and Professor Greggs’ Comments on Potsdam Sandstone

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I find it interesting,  when considering how the theory of the origin of  the Potsdam Group sandstones (of Ontario, Quebec and New York Stat...
Thursday, 2 March 2017

Sandstone Filled Cracks Extending into Marble at an Outcrop Near The Cat’s Meow

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In my last blog posting I mentioned that Dr. Easton (2015) had reported “A previously unknown exposure of Potsdam group sandstone and conglo...
Saturday, 31 December 2016

Ontario Geological Survey Remapping the Perth Map Sheet

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I was driving into Perth in August when I noticed an individual taking a sledge hammer to an outcrop of granite along Scotch Line (County Ro...
Thursday, 1 December 2016

Gypsum Pseudomorphs that formed in the Sabkha Environment of the Potsdam Group

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“Sabkhas are supratidal, forming along arid coastlines and are characterized by evaporite-carbonate deposits with some siliciclastics” Wikip...
Monday, 31 October 2016

The Ellisville Potsdam Sandstone Quarry Revisited

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A week ago Sunday I had the pleasure of attending the second day of the Niagara Peninsula Geological Society Field Trip to Eastern Ontario a...
Friday, 7 October 2016

The Metcalfe Geoheritage Park in Almonte, Lanark County; and Geoheritage Day 2016

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This posting covers a few of the ways that our Geoheritage is promoted in Eastern Ontario. The Metcalfe Geoheritage Park in Almonte, Lanar...
Thursday, 29 September 2016

Eighty-one feet of Dark Grey Paleozoic Shale was Logged under the Potsdam by Bruce A. Liberty in Core from a Hole Drilled at Knowlton Lake, Ontario and reported in a Geological Survey of Canada Paper published in 1971

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I expect that many  people reading the title of this posting, if they have a working knowledge of the sedimentary rocks of Eastern Ontario, ...
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