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...
Monday, 14 January 2013

Perthite from Burgess Ward, Tay Valley Township, Lanark County, Ontario

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In an earlier posting I described two outcrops of pegmatite containing perthite, an exsolution texture in feldspar, that are found appr...
Monday, 17 December 2012

“Perth stone” Purple-banded Sandstone From the Hughes Quarry, Lanark County, Ontario

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A distinctive purple-banded sandstone is featured in many residences and public buildings in Perth and in Lanark County that were construct...
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