Tuesday, 29 December 2015

More Evidence of Microbial Mats in Potsdam Sandstone near Newboro, Eastern Ontario

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Winter has arrived in Eastern Ontario.  Eight centimeters of snow fell last night and more is forecast for today.   I’m glad that on Decembe...
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Wednesday, 23 December 2015

Dewatering Structures, Biofilm Structures, Glacial Striae and Chatter Marks in Potsdam Sandstone near Newboro, Eastern Ontario

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It has been a remarkably warm December for Eastern Ontario and we have yet to receive anything more than a light dusting of snow.  Yesterday...
Tuesday, 15 December 2015

Problematic Markings (Dubious Fossils) in Potsdam Sandstone

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Below are two photographs that I took over two years ago of one side of a loose slab of Potsdam sandstone that I noticed at the quarry at El...
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Wednesday, 4 November 2015

In 1924 a report of Stromatolites in Nepean Sandstone by Dr. Morley E. Wilson of the Geological Survey of Canada, and Other Reports of Stromatolites and Biofilms in the Potsdam

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At the end of this blog posting I’ve provided a list of articles discussing stromatolites and biofilm structures in Potsdam (Group) Sandston...
Monday, 26 October 2015

A Good Year to Look at the Stromatolites along the Ottawa River - Part 2, near Dunrobin

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The water level of the Ottawa River is still low.  As a consequence outcrops that form the river bed are visible and accessible.   Below are...
Thursday, 22 October 2015

Soft-Sediment Deformation (Seismites) in Nepean Sandstone Close to the Rideau Lake Fault

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Soft-sediment deformation structures are deformations that occur in sediments that have not undergone lithification before the deformation s...
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Thursday, 1 October 2015

A Good Year to Look at the Stromatolites along the Ottawa River

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We were blessed with a fairly dry summer in Eastern Ontario.  As a consequence  the Ottawa River is low and it is a very good year to look a...