Thursday, 14 September 2017

A Field Trip to the Ellisville Potsdam Sandstone Quarry

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Last Sunday I visited the sandstone quarry at Ellisville, Ontario as part of an annual field trip organized by the Niagara Peninsula Geologi...
Monday, 4 September 2017

Abraham, Logan and Owen: The Discovery of the First Protichnites trackways – Part 2

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[Part 1 of this article was posted August 29, 2013.] In 1851 Logan took to London a small slab of sandstone and a plaster cast of a 12 ½ f...
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 ...