Geology: An Introduction
E. Schroeder
The geology of Jack’s Lake is vast and interesting. This region is made up of hard, ancient rocks with minimal soil cover. Even during early surveys it was noted that Belmont and Methuen Townships possessed some valuable mineral deposits such as gold, iron and marble.
Bibliography
Illustrated Historical Atlas Peterborough County 1825-1875; The Peterborough Historical Atlas Foundation Inc.; 1975.
Mulvany, Dr. C. Pelham; History of the County of Peterborough Ontario; C. Blackett Robinson; Toronto; 1884. Pg. 433 & 434.
THE GEOLOGY OF JACK’S LAKE-Notes from a local Cottager
Ada Dixon, Williams Bay (photos also by Ada Dixon)
With writing assistance from John Ellis, Rathbun Bay
September 7, 1999
As we relax at Jack’s Lake from year to year, we can’t help but notice the fascinating environment that surrounds us. For cottagers who have been on the lake for years or generations, this beautiful place has become imprinted in our memories. Although there are many fascinating sights to see on Jack’s Lake-many would agree that one of the most interesting is our rocks!
Part 1: Geology 101
Formed long before humans, dinosaurs or even plants existed, the rocks at Jack’s Lake rank among the most fascinating in the world. The lake is located within the Precambrian Shield (better known as the Canadian Shield), which began to form as the earth was cooling. The Canadian Shield accounts for some of the oldest rocks in the world: some being more than three billion years old, some as young as 570 million years. These Precambrian rocks are the bedrock (also known as “basement rock”) which forms the foundation of every continent in the world. Interestingly, at Jack’s Lake the shield is not buried under younger rock, but is right on the surface – for all to see.
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