By Tetradium
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Another interesting thing about Upper Decorah Formation is numerous of unidentified Zygospira species along with orthids of different sizes. For some unknown reasons Zygospira species are largely missing from lower to middle Decorah Formation even though they're abundant in Middle Platteville as well too in Twin Cities.
From the album:
Platteville to Decorah formation Ordovician Twin Cities
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Photo Information
- Taken with EASTMAN KODAK COMPANY KODAK DX7590 ZOOM DIGITAL CAMERA
- Focal Length 13.7 mm
- Exposure Time 1/40
- f Aperture f/3.2
- ISO Speed 100
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