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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Sunday, 18 November 2012

An Iron Ore Deposit in the Potsdam Sandstone of Eastern Ontario: The Hematite Deposit Between Delta and Furnace Falls

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An early report that describes the rocks of Lanark County is the Report on the Geology of a Portion of Eastern Ontario by R.W. Ells that was...
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Monday, 5 November 2012

From Trails, to Mud Cracks to Evidence of Microbial Mats: Different Theories For Curved Lines in the troughs of ripple marks in Sandstone

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The above photographs shows curved lines in the troughs of ripple marks in sandstone. The ripple marks are evidence of wave action in an...
Friday, 19 October 2012

Mud cracks, Liesegang bands and Liesegang rings, and possible Soft-Sediment Deformation Structures in Sedimentary Rocks of Lanark County, Ontario in an Area Mapped as March Formation

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Added: November 30, 2012: Above I’ve provided photographs of brightly coloured and patterned beds of rock toge...