Marker Logo HMdb.org THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Maplewood in Ramsey County, Minnesota — The American Midwest (Upper Plains)
 

History in Depth

 
 
History in Depth marker image. Click for full size.
By McGhiever, August 9, 2019
1. History in Depth marker
Inscription.  Minnesota has some of the most interesting geological history found anywhere on Earth. Depending on where you stand in the state you can see rock formed 3.6 billion years ago and then exposed during the last ice age.

The bedrock soils beneath your feet are millions of years old from a time of dramatic geologic, climatic and evolutionary change. These rock layers were formed during the two earliest periods of the Paleozoic era between 540 and 440 million years ago. A shallow sea covered this area. Sandstone was formed from an ancient beach, limestone was formed from the sea and its creatures, and shale was formed from mud.

Beginning over 110,000 years ago and continuing until 12,000 years ago, glaciers covered much of North America. This event formed the Great Lakes and shaped the modern Minnesota landscape. Over two hundred feet of drift soils were scrapped, pushed and carried to this part of Minnesota when the glaciers finally receded.

Groundwater Aquifers
Deep below Minnesota's teaming lakes and rivers is another unseen source of valuable water. Much of the state's southern half has deeply buried sandstone,
History in Depth marker and surroundings image. Click for full size.
By McGhiever, July 31, 2019
2. History in Depth marker and surroundings
limestone and dolomite aquifers. An aquifer is an underground layer of water-bearing permeable rock accessible by drilling a well.

This water is typically much cleaner than surface water as it is slowly filtered by the rock through which it moves making it a valuable source of drinking water. Below you are several aquifers including the Prairie du Chien limestone, Jordan sandstone and Franconia sandstone aquifers.

Caption:
Glaciers once covered all of the Upper Midwest.

Caption:
Sandy soils were exposed during storm basic excavation in 2012. Gladstone Savanna looked like a big sandbox. This was the top 25 feet of soil deposited by the last glacier.

Caption:
Before the well was sealed in 2001 the Minnesota Geological Survey documented layers of glacial drift and bedrock that the well had penetrated.

Caption:
A 100-foot layer of Jordan Sandstone starts 371 feet below ground here.

Protecting Groundwater
The Gladstone Shops' well went through and connected three different aquifers, breaking a confining layer of dolomite in the process. Once abandoned, this well was a potential pathway for surface contaminates to enter the aquifer and threaten drinking water. Sealing the well helped preserve and protect groundwater for years to come.
 
Erected by City of Maplewood
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Location. 44° 59.886′ N, 93° 2.861′ W. Marker is in Maplewood, Minnesota, in Ramsey County. Marker can be reached from the intersection of Frost Street and English Street. Marker is at the end of a short spur in the Gladstone Savanna trail system, in the east-central part of the preserve. Touch for map. Marker is in this post office area: Saint Paul MN 55109, United States of America. Touch for directions.
 
Other nearby markers. At least 8 other markers are within 3 miles of this marker, measured as the crow flies. Gladstone Savanna's Natural History (about 400 feet away, measured in a direct line); A History of Change (about 400 feet away); Building the "Skally" (about 400 feet away); Destination Lake Phalen (approx. 0.6 miles away); Phalen Regional Park Waterfall (approx. 0.7 miles away); Frost Avenue (approx. 0.7 miles away); Ramsey County Cemetery (approx. 1.2 miles away); What Did They Do? (approx. 2.2 miles away). Touch for a list and map of all markers in Maplewood.
 
Categories. Environment
 

More. Search the internet for History in Depth.
 
Credits. This page was last revised on August 12, 2019. This page originally submitted on August 11, 2019, by McGhiever of St Paul, Minnesota. This page has been viewed 89 times since then. Photos:   1, 2. submitted on August 11, 2019, by McGhiever of St Paul, Minnesota. • Bill Pfingsten was the editor who published this page.
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