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Geology of the Dunes


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Geology of the Dunes

What is a crinoid and where do I find one?

on
March 12, 2018

What is a crinoid?
Known in the area as one of our greatest treasures, crinoids can be found along the shores of Lake Michigan. Crinoids (also known as Indian Beads) are plantlike marine animals that lived over 500 million years ago back when our area was a saltwater sea. They…


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Geology of the Dunes Uncategorized

Why did the area look like a washboard? Beach ridges and Swales! – Pt. 5

on
April 4, 2016

Submitted by: Patty Kostro

In the January blog we discussed some of the geologic landforms that helped shape the eastern part of our shoreline from Ogden Dunes to Michigan City, primarily the Great Marsh. This month we will look at what was forming along the shoreline from Ogden Dunes into…


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Geology of the Dunes Uncategorized

An interesting look at the Great Marsh and how it was created. – Pt. 4

on
January 14, 2016

Submitted by: Patty Kostro

As previously discussed in the December blog, the Lake Michigan shoreline, as we see it today, is due to many geologic changes over the past 14,000 years. As the Michigan glacial lobe advanced and retreated, Lake Michigan endured many different shapes and elevations due to the…

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