Thursday, 20 June 2013

A Few Trace Fossils in Potsdam Group Sandstones of Eastern Ontario

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The Potsdam Group sandstones and conglomerates generally form the basal layer of Paleozoic rocks overlying the Precambrian Shield in Eastern...
Wednesday, 12 June 2013

Perthite, Part 2

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In my posting last January 14 th I set out where to find what is believed to be the type locality for Perthite. In February I received an...
Monday, 6 May 2013

On the trail of Climactichnites wilsoni - Part 3: A quarry about a mile from Perth as the town existed in 1859

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I have found an overgrown, abandoned small quarry that is about a mile from the town of Perth as the town existed in 1859 at the edge of...
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Thursday, 18 April 2013

Glacial Erratics and Eskers in the Township of Lanark Highlands, Lanark County, Ontario

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About 79 thousand years ago the Wisconsin ice age started, glaciers formed, advanced and retreated, and at their maximum extent covered most...
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Monday, 18 March 2013

Sources for Geologic Maps of Lanark County and Eastern Ontario

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This posting sets out the where one can obtain geologic maps of Lanark County and adjoining parts of Eastern Ontario. It concentrates on onl...
Monday, 11 February 2013

On the trail of Climactichnites wilsoni - Part 2: References to the Quarry Near Perth in the Scientific Literature, and the Geologic Mapping of Lot 6

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The first part of this series on Climactichnites wilsoni covered the announcement of the finding of the fossil, described the specimens that...
Thursday, 31 January 2013

On the trail of Climactichnites wilsoni - Part 1: Specimens Collected from a Quarry near Perth, Ontario

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Over one hundred and fifty years ago Sir William E. Logan of the Geological Survey of Canada announced to the world the finding of a "n...