One of the best places in Lanark County to see evidence of the glaciers is in the Township of Lanark Highlands, particularly along County Road 12 from Playfairville to McDonalds Corners, and along Highland Line, a road off County Road 12 that takes one to Wheelers Pancake House, Sugar Bush and Maple Syrup Museum. At least four commercial sand pits are visible when driving along County Road 12 and Highland Line. The sand in these deposits was left by the glaciers, probably as eskers and fluvioglacial deposits. Also of interest are the glacial erratics that are strewn around the countryside. The hiking trails at Wheelers, which are open year round, provide ample opportunities to view the glacial erratics. The hiking trail that starts directly behind Wheelers Maple Heritage Museum exhibits hundreds of rounded erratics, many in the order of a meter in diameter. However, the largest erratics can be found adjacent to the road into Wheelers. The photographs below show some of the bigger erratics. The person in the photographs is just under five feet (1.5 meters) tall.
The restaurant at Wheelers, the Maple Heritage Museum, a second Museum displaying Vern Wheeler’s collection of over 300 ‘antique’ chainsaws, and the hiking trails are all open year round, seven days a week, from 9 am to 3 pm.
Here is a link to Wheelers: http://www.wheelersmaple.com/
On the maps the Unit R (light pink) is Precambrian Rock; Unit 1a (dark green) is a Glacial till blanket; Unit 1b (light green) is a Glacial Till Veneer; Unit 4b (dark purple) is Littoral and Nearshore Glaciolacustrine Deposits (gravel, sand, clay); and Unit 7 (grey) is Organic deposits (i.e., muck, peat, bogs, fens, swamp).
Download Sites for Maps
If anyone is interested in looking at the whole of the maps, they can be downloaded free of charge from the Geological Survey of Canada Web site.
Surficial Geology, Perth, Ontario
Kettles, I M (1992), Geological Survey of Canada, Map 1800A,
Surficial Geology, Sharbot Lake, Ontario
Henderson, P J, and Kettles, I M (1992)
Geological Survey of Canada, Map 1799A,
Anyone wanting to look at the maps as an overlay on Google Earth should consult:
Surficial Geology of Southern Ontario
This provides a layer on Google Earth which depicts the distribution and characteristics of surficial deposits across southern Ontario.
The following publications discuss glaciation in Eastern Ontario.
Quaternary History of Eastern Ontario: Impacts on Physical Landscape and Biota
Stephen C. Lougheed and Natalie Morrill
Barnett, P. J. (1992), Quaternary Geology of Ontario, Chapter 21 in Geology of Ontario, Special Volume 4, Part 2
Ontario Geological Survey, Special Publication, SV04-02
Christopher P. Brett