Tuesday, 25 April 2017

Andrew’s Outcrops

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Andrew is one of the many polite teenagers that Lanark County produces by the bushel load.   He also has a keen interest in geology.  This p...
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Sunday, 23 April 2017

The Cylindrical Structures in Lanark County reported in Jean Dugas’ 1952 Doctoral Thesis

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In my  August 27, 2015 blog posting I mentioned that Jean Dugas,in the notes to geological  Map 1089A, reported that cylindrical or conical ...
Sunday, 2 April 2017

A Possible Conical Fossil Near the Base of the Potsdam Group

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In my blog posting for  March 2, 2017 I reported on a sandstone outcrop in Lanark County on the north side of Highway 7 approximately 5 km w...
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...