Monday, 17 July 2017

The Pike Lake Pluton - A Layered Syenite Intrusion in Lanark County

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The Pike Lake Pluton lies about 12 kilometres (8 miles) south of Perth between Pike Lake and Black Lake.  It falls mainly within North Burge...
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Wednesday, 12 July 2017

Outcrops of Orbicular Granite in Lanark County, Ontario

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“Orbicular granite (also known as orbicular rock or orbiculite) is an uncommon plutonic rock type which is usually granitic in composition. ...
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Monday, 22 May 2017

Why has hardly anyone referred to core from the GSC’s Borehole Geophysics Test Area at Bell’s Corners, Ottawa, when the core contains a 50 cm thick shale layer in the Nepean Formation and the core straddles the boundary between the Nepean Formation and the overlying March Formation?

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I have to admit that I cannot answer that question and that I’m writing a blog posting on the topic in the hopes that someone will be able t...
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...