Erratics

As you travel the Calumet Region, you may see boulders.  I never really thought much about these boulders until I started my research about the glacial history of the Calumet Region.  First of all, these boulders have a name.  They are called erratics.  Erratics are "boulders that have been moved from their original location and found elsewhere, often scattered throughout moraines." Schoon, pg. 221

 

These huge rocks are native to Canada and upper Michigan.  They were carried here by glaciers during the recent ice age.  When the boulders were dragged by the glaciers they could have possibly created large striations, which are deep scratches in the bedrock underneath.  The scratches are usually parallel to the direction that the glacier had moved. Schoon, pgs. 13, 17

 

The large granite boulders are often found on till ("a mixture of clay, silt, sand, pebbles and boulders") and moraines ("a geographical feature composed of materials that were deposited by a glacier"). Schoon, pgs. 16, 221. When I needed to look for the erratics for my class, I wasn't sure exactly where I would find them in our area.  As it turns out, they are everywhere.  Residents of this area have moved them to their homes, their businesses and you can also find them at your local park.  While driving through my community, I did find erratics just about everywhere.  My neighbors across the street have a couple in front of their landscaping and my friend has some that border her driveway.  It's amazing to think that they were first brought here by glaciers!

 

References: Schoon J. Kenneth, Calumet Beginnings

 

 

 

 

 

 

The erratics shown above are located on the grounds

of the St. George Greek Orthodox Church in Schererville.

 

Photographs Taken By: Carol Haynes

Erratic in front of Stephen Park in Schererville.

 

Photograph Taken By: Carol Haynes

Erratics border a dentist's office in Schererville,  just south

of Route 30.

 

Photograph Taken By: Carol Haynes

 

 

 

 

 

 

 

Tolleston Shoreline/Gibson Woods

I grew up in Hammond and now work in the Hessville section of Hammond.  I find it interesting that part of the Tolleston Shoreline can be found near the Hess Cemetery at the intersection of 169th and Parrish.  When the Tolleston Shoreline was first created, the upper Great Lakes had three outlets.  There was the North Bay Outlet near Georgian Bay, the Port Huron Outlet past what is now Detroit, and the Chicago Outlet.  The North Bay Outlet raised higher than the two other outlets and then couldn't carry water out of the lakes.  Eventually erosion occured along the Port Huron Outlet, slowly lowering it and with it the level of Lakes Huron and Michigan so that the Chicago Outlet, having a floor of bedrock, became dry. Schoon, pg. 37.

 

During the Algoma phase about 3,800 years ago, the lake level dropped to its current level.  The lower water levels were created from erosion at Port Huron and dry weather conditions. The higher water levels were caused by intervals of greater rainfall.  This pattern created more than 150 small beach ridges.  Some of these beach ridges can still be seen in Miller and the Tolleston/Brunswick areas of Gary.  One of the longest dune ridges still remaining is in Hessville at Gibson Woods.  Schoon, pgs. 37, 38.  Gibson Woods "sits on 131 acres of virtually undisturbed land.  The dune and swale features of the preserve were produced after the last glacier created ancient Lake Chicago, the forerunner of Lake Michigan.  The parallel sand ridges still found in Gibson Woods today represent the effect of Lake Chicago as it retreated thousands of years ago." http://www.lakecountyparks.com/gibson.html

 

References: Schoon J. Kenneth, Calumet Beginnings

http://www.lakecountyparks.com/gibson.html

 

Part of the Tolleston Shoreline located at the intersection

of 169th St. and Parrish in Hammond.

 

Photograph Taken By: Carol Haynes

 

The Hess Cemetery is located by the Tolleston Shoreline

in Hessville.

 

Photograph Taken By: Carol Haynes

 

Gibson Woods is located on Parrish Ave. in Hessville.

 

Photograph Taken By: Carol Haynes

 

Gibson Woods Nature Preserve in Hessville.

 

Photograph Taken By: Carol Haynes

 

 

 

 

 

 

 

Glenwood Shoreline/Tinley Moraine

I have lived in Schererville for over thirty years and I am now just discovering that Schererville sits along the old Glenwood Shoreline.  A great deal of sand has been removed, so it is hard to see. 

When traveling, if you approach the intersection of Indianapolis Blvd. and Route 30, you can still see the shoreline if you are looking north.  South of the intersection is a hilly area that is part of the Tinley Moraine ("a geographical feature composed of materials that were deposited by a glacier.  Two common types of moraine are ground moraine and end moraine"). Schoon, pgs 180, 181, 221.  An end moraine is "a band of hills formed at the furthest extent of a glacial advance.  A glacier may form an end moraine each time it advances and retreats." Schoon, pg. 221.

 

During my travels, I stopped at Teibels Restaurant at the intersection of Routes 41 and 30.  I then took pictures north and south of the intersection. 

Teibels Restaurant sits on the corner of Route 41 and

Indianapolis Blvd.  This picture is looking south of

the intersection.

 

Photograph Taken By: Carol Haynes

 

Picture taken looking northbound from the intersection

of Route 30 and Indianapolis Blvd.

 

Photograph Taken By: Carol Haynes

 

 

 

The Tinley Moraine ventures south to 231 Hwy.  I traveled on Route 41 and came to 231 Hwy which is close to Dick's Restaurant.  I took pictures at this intersection of Hwy 231, which runs east and west and then took pictures north and south of the Hwy.  There is also the Biesecker Prairie Nature Preserve that sits at the southeast corner of U.S. 231 and U.S. 41.  The prairie sits on 34 acres of land.  It is considered to be a small portion of the larger prairie that once covered western IN.  It is a grass prairie on top of rolling hills.  You can find little bluestem, Indian grass, prairie dock and rattlesnakes in the prairie.  Also rare and endangered plants such as flax, can also be found here.  http://www.historyandtheheadlines.abc-clio.com/

This is Hwy 231 which runs east and west.  The Biesecker

Prairie Nature Preserve is just south east of Hwy 231.

 

Photograph Taken By: Carol Haynes

Hwy 231 looking westward, just south of St. John.

 

Photograph Taken By: Carol Haynes

Biesecker Prairie Nature Preserve at the intersection

of Route 41 and Hwy 231

 

Photograph Taken By: Carol Haynes

 

 

 

 

I traveled back north to Route 30.  I then went west and headed down Route 30 to get more pictures of the Glenwood Shoreline.  I stopped by Meyers's Castle and took some photos there.  The Meyer's Castle is a replica of a Scottish castle.  It was completed in 1931. Back then, it was considered to be the most lavish mansion in the Calumet Region.  http://en.wikipedia.org/wiki/Meyer%27s-Castle.

 The castle sits atop a large dune.  "The sand dunes in the Dyer area were said to be 30-40 ft. high in the late 1930's.  Few of these exist today." Schoon, pg. 28.

Meyers Castle sits on the Glenwood Shoreline.

It is located on Route 30 in Dyer.

 

Photograph Taken By: Carol Haynes

Meyers Castle sits on an ancient sand dune.

 

Photograph Taken By: Carol Haynes

 

 

 

 

 

I then ventured farther west into Glenwood Illinois.  During the Glenwood Phase "lake currents and waves built up long spits, or sandy peninsulas on the down-current sides of these islands (Mt. Forest Island, Blue Island, and Glenwood Island in Cook County, Hobart Island in Lake county, and various small islands in Porter and LaPorte Counties in Indiana).   The Glenwood Spit, southeast of the original Glenwood Island (and along today's Glenwood Dyer Road) now forms one of the best visible portions of the Glenwood Shoreline."  Schoon, pg. 30.

Intersection of Glenwood Dyer Road

 

Photograph Taken By: Carol Haynes

Glenwood Dyer Road

Part of the Glenwood Shoreline

 

Photograph Taken By: Carol Haynes

 

 

 

I travel through these areas all the time, but I find it more fascinating now knowing the geological history of these areas.  I will certainly look at our landscapes in the Calumet Region now with a new respect. 

 

References: Schoon J. Kenneth, Calumet Beginnings,

http://www.historyandtheheadlines.abc-clio.com/

http://en.wikipedia.org/wiki/Meyer%27s-Castle.