Fossils and Geology of Lanark County, Ontario
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...
Tuesday, 1 June 2021
What's New in Potsdam Sandstone?
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Not much. Li and Ji (2020) investigated the orthogonal joints in the Potsdam sandstone at Ausable Chasm (New York State) and Beauharnois...
Monday, 3 May 2021
John Finch’s (1833) and Captain R. H. Bonnycastle’s (1833, 1836) reports of Basaltiform Lithographic Limestone at Murney's Point, Kingston, Upper Canada
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In my last posting I provided numerous references to columnar sedimentary rocks where the columns resemble the columnar structure of basalt...
Tuesday, 16 March 2021
A Rock that Cracked Like Mud Cracks, and Polygonal and Columnar Structures in Sedimentary Rocks
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I suspect that everyone reading this blog posting will be familiar with polygonal mud crack patterns on the surface of sedimentary rocks an...
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