The 1,000-Mile Great Lakes Adventures

Showing posts with label glacial grooves. Show all posts
Showing posts with label glacial grooves. Show all posts

Wednesday, August 27, 2014

Misery Bay

I hiked the trails in 
on Manitoulin Island.

This park has some of the best examples of alvar habitat, these large, exposed areas of limestone.

Some still bear the scrape marks from the glaciers.




The horizontal lines are glacial scrapes


This is a rare "puddingstone" among all the limestone


The limestone along the shore has been shaped by Lake Huron


Many fossilized corals are exposed in the limestone


Here's a large chain coral


Limestone flats = Alvar 






Saturday, September 28, 2013

The Glaciers as Artist...

While on Kelleys Island in Lake Erie, I hiked to the Glacial Grooves State Memorial.
When I give lectures about the Great Lakes, I always mention how these lakes were formed during the last ice age by a series of glaciers that came down from the north to scour out the lake basins. On Kelleys Island, you can see the handiwork of the glaciers stretching over this preserved 3 acres that still clearly show the hand of the glaciers.



These grooves scoured in a limestone bed thousands of years ago are the most famous glacial grooves in the world.


Much of this area was covered in glacial till (dirt and rocks deposited by the melting glaciers) until the 1970s. Excavation was a meticulous process. Today, an almost 400 feet long stretch of grooves is exposed and protected for us all to marvel at.