Fossils and Geology of Lanark County, Ontario
Sunday, 8 August 2021
Concentric Circular Structures and an Ovoid Burrow in Rocks Mapped as the Ordovician March (Theresa) Formation
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In various blog postings dated from 2014 to 2016 I included photographs of cylindrical dewatering structures in the Cambrian Potsdam sandst...
Friday, 30 July 2021
What was Alice E. Wilson Thinking When She Renamed the Theresa Formation as the March Formation for the rocks of the Ottawa Embayment?
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There are two ways of interpreting the title of this blog post. I have adopted the kinder interpretation. I am writing this posting to e...
Friday, 4 June 2021
If a tree falls in a forest and no one is around to hear it fall, does it make a sound?
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Below I summarize a few obscure writings on the Potsdam sandstone. A 1979 Master’s Thesis by John Cass on the Beekmantown Group in the Otta...
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