By Tetradium
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Larger picture of the same trilobite. Just to show an example of upper Decorah twin cities hash plates. Certain crinoid species are very strongly represent compare to middle and lower Decorah Formation. The largest crinoid species is often in single pieces or sizable stem pieces but head and suction portion are unusually absent. In Middle and Lower Decorah formation, the density of crinoid fossils tend to be lower.
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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 6.3 mm
- Exposure Time 1/50
- f Aperture f/2.8
- ISO Speed 80
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