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Only at the highest points of this landscape can we see the lineated surface of the till plain that covered this region after the recession of the last ice sheets, about 14,000 years ago. <\/p>\n"},"library":"H5P.Text 1.1","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"},"subContentId":"bd098260-260f-4878-b93c-cda43e8e9ef8"}],"header":"Original Glacial Surface"},{"position":{"x":43.94184168012924,"y":64.1583568071464},"alwaysFullscreen":false,"content":[{"params":{"text":"

This ledge marks the high water mark of Glacial Lake Algonquin. The stormy waters eroded away at the till plain until it made a distinct bluff surrounding islands of sediment.<\/p>\n"},"library":"H5P.Text 1.1","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"},"subContentId":"d9089af2-c3b6-46d0-8a4f-ae43bb62fd27"},{"params":{"contentName":"Image","file":{"path":"images\/file-6207ed58dc3bb.jpg","mime":"image\/jpeg","copyright":{"license":"U"},"width":1241,"height":702},"alt":"Google Earth model of the Algonquin Bluff","title":"Google Earth model of the Algonquin Bluff"},"library":"H5P.Image 1.1","metadata":{"contentType":"Image","license":"U","title":"Untitled Image"},"subContentId":"3af210dd-ccc2-44db-882a-0dbeb67e7162"}],"header":"Lake Algonquin Bluff"},{"position":{"x":43.780290791599356,"y":72.62201195219123},"alwaysFullscreen":false,"content":[{"params":{"text":"

The most recent high-water level was about 5000 years ago. We call this the \u2018Nippissing stage\u2019.The most recent high-water level was about 5000 years ago. We call this the \u2018Nippissing stage\u2019.<\/p>\n"},"library":"H5P.Text 1.1","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"},"subContentId":"97d55078-b581-448e-af04-639e80a04a7a"},{"params":{"contentName":"Image","file":{"path":"images\/file-6207ec572cbf0.jpg","mime":"image\/jpeg","copyright":{"license":"U"},"width":1241,"height":702},"alt":"Google Earth view of Nippissing Bluff","title":"Google Earth view of Nippissing Bluff"},"library":"H5P.Image 1.1","metadata":{"contentType":"Image","license":"U","title":"Untitled Image"},"subContentId":"7d5da40c-bf13-441e-9242-643017bfd2bb"}],"header":"Nippissing-stage bluff"},{"position":{"x":41.35702746365105,"y":75.30872603336654},"alwaysFullscreen":false,"content":[{"params":{"text":"

The Georgian Bay is currently about 176 m above sea level.<\/p>\n"},"library":"H5P.Text 1.1","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"},"subContentId":"b759052a-4d9b-485e-9417-0fbd71633b12"}],"header":"Modern water level"},{"position":{"x":36.84210526315789,"y":72.10983017743644},"alwaysFullscreen":false,"content":[{"params":{"text":"

Falling water levels over the past few thousand years are actually a result of \u2018glacioisostatic rebound\u2019 of the land. It\u2019s the land that is rising, not the level of Lake Huron falling. As a result, beaches are continually growing outwards to keep up with the migration of the coastline.<\/p>\n"},"library":"H5P.Text 1.1","metadata":{"contentType":"Text","license":"U","title":"Untitled Text"},"subContentId":"e2fe92e2-f2dc-4b43-bca7-ca56bf620a80"},{"params":{"contentName":"Image","file":{"path":"images\/file-6207eb112b27f.jpg","mime":"image\/jpeg","copyright":{"license":"U"},"width":1241,"height":702},"alt":"A satellite image of raised beaches.","title":"A satellite image of raised beaches along this coast."},"library":"H5P.Image 1.1","metadata":{"contentType":"Image","license":"U","title":"Untitled Image"},"subContentId":"1cccd837-bb15-45b3-acd0-bef5bfe223c5"}],"header":"Raised Beaches"}],"hotspotNumberLabel":"Hotspot #num","closeButtonLabel":"Close","image":{"path":"images\/image-6207e7baddfc5.png","mime":"image\/png","copyright":{"license":"CC BY-SA","author":"Kirsten Kennedy","title":"Penetang Peninsula Topography","version":"4.0","year":"2022"},"width":759,"height":610},"backgroundImageAltText":"Topographic map of the Penetang Peninsula"}

Changing lake levels and the topography of the Penetang Peninsula

Kirsten Kennedy