By Tetradium
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Sowerbyella minnesotensis. Upper Decorah formation, all of Galena Formation. Tend to be characterizing into identification of Upper Decorah formation (only exposed in Lilydale Regional Park and southern Minnesota). Other locations in Twin Cities tend to be lower (maybe middle) Decorah formation. Very abundant, can make up a big section of some shell hash. The one specimen in the middle is the largest and complete that I had found so far.
From the album:
Brachiopods of Platteville/Decorah Twin Cities Minnesota
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Photo Information
- Taken with EASTMAN KODAK COMPANY KODAK DX7590 ZOOM DIGITAL CAMERA
- Focal Length 6.3 mm
- Exposure Time 1/30
- f Aperture f/2.8
- ISO Speed 100
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