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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Sioux Falls in Minnehaha County, South Dakota — The American Midwest (Upper Plains)
 

Inland Seas

 
 
Inland Seas Marker (<i>side 1</i>) image. Click for full size.
Photographed By Cosmos Mariner, August 21, 2016
1. Inland Seas Marker (side 1)
Inscription.  
(side 1)
The changing of global sea levels over millions of years was a major factor in determining the ancient geography of Minnehaha County. Through much of geologic time, salty warm-water seas covered the interior of the United States.

During the late Cretaceous Period, 65 to 80 million years ago, rising ocean levels several times produced flooding that created inland seaways. Extending from the Gulf of Mexico to the Arctic Circle, these seas divided North America into two parts.
(Continued on other side)
(side 2)
(Continued from other side)
The highest elevations of the Sioux Quartzite Ridge became exposed islands with irregular shorelines containing shallow, quiet-water bays. Sediments laid down in these bays contained fossils of wood, plant imprints, carbonized plant fragments, tiny mollusks, and fish parts.

During the Ice Age, these deposits were buried by glacial drift. Several exposures of the ancient bay deposits may be seen at points where the Big Sioux River, Split Rock Creek, and Slip-Up Creek have eroded through the glacial
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overburden.

Dedicated in 2003 by the Minnehaha County Historical Society and the City of Sioux Falls.

 
Erected 2003 by Minnehaha County Historical Society and the City of Sioux Falls.
 
Topics. This historical marker is listed in these topic lists: EnvironmentNatural FeaturesPaleontologyWaterways & Vessels.
 
Location. 43° 33.362′ N, 96° 43.354′ W. Marker is in Sioux Falls, South Dakota, in Minnehaha County. Marker can be reached from North Weber Avenue, 0.2 miles south of East Falls Park Drive. Marker is located in Falls Park, along the walkway on the west side of the Queen Bee Mill Ruins, overlooking the Big Sioux River. Touch for map. Marker is in this post office area: Sioux Falls SD 57104, United States of America. Touch for directions.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. Philander Prescott (within shouting distance of this marker); The Queen Bee Mill (within shouting distance of this marker); Hive of the Queen City (within shouting distance of this marker); Namesake of the City (within shouting distance of this marker); Harnessing the River (within shouting distance of this marker); Foundation of the City (within shouting distance of this marker);
Inland Seas Marker (<i>side 2</i>) image. Click for full size.
Photographed By Cosmos Mariner, August 21, 2016
2. Inland Seas Marker (side 2)
Beginning of Great Changes (within shouting distance of this marker); Legacy of Ice and Rock (about 300 feet away, measured in a direct line). Touch for a list and map of all markers in Sioux Falls.
 
Inland Seas Marker (<i>wide view southeast; Queen Bee Mill ruins in background</i>) image. Click for full size.
Photographed By Cosmos Mariner, August 21, 2016
3. Inland Seas Marker (wide view southeast; Queen Bee Mill ruins in background)
Inland Seas Marker (<i>wide view southwest; overlooking Big Sioux River and Falls</i>) image. Click for full size.
Photographed By Cosmos Mariner, August 21, 2016
4. Inland Seas Marker (wide view southwest; overlooking Big Sioux River and Falls)
 
 
Credits. This page was last revised on October 6, 2018. It was originally submitted on October 3, 2018, by Cosmos Mariner of Cape Canaveral, Florida. This page has been viewed 326 times since then and 22 times this year. Photos:   1, 2, 3, 4. submitted on October 4, 2018, by Cosmos Mariner of Cape Canaveral, Florida. • Andrew Ruppenstein was the editor who published this page.

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May. 24, 2024