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Jordan sandstone in Red Wing, MN

There are four rock formations in Barn Bluff. This class focuses on learning how to recognize these four rocks. Meetings are on four Tuesdays, beginning February 8, 2005 and ending March 1, 2005. Classes take place at Twin Bluff School, between 4:30 pm and 5:30 pm. As a matter of strict policy, no student will visit Barn Bluff in the period from February 1, 2005 through March 31, 2005. At other times, all signs posted concerning Barn Bluff trail access will be observed.

The set of four classes is being coordinated by Joyce Peterson. Joyce teaches at Burnside Elementary School. Students in 4th and 5th grades are being invited to attend.

The rock formations making up Barn Bluff are: Franconia greensand, St. Lawrence siltstone, Jordan sandstone, and Oneota dolomite.

Imagine you are in a car going down the Highway 58 hill away from the Pioneer Road intersection toward the foot of the hill. Notice a rock cut on your right hand side. You first see Oneota dolostone and then you see Jordan sandstone under the dolostone.

The 4th and 5th grade students are to practice studying loose Jordan sandstone at 10X, and then examine the same specimen using a 10X microscope.
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Mag 10X.
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Mag 60X.
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Mag 200X.

  • Go to the Minnesota Geological Survey (MGS) home page, and look through the list of available Educational Materials. Download and read the document titled "Ancient tropical seas—Paleozoic history of Southeastern Minnesota".
  • Search Google for "Minnesota Jordan sandstone". It will help to search the word "craton" and the term "North America epicontinental sea".

  • our address: glennbowie@hotmail.com.