100_9138
By Tetradium
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One of the fossil found yesterday in upper Decorah. I think it is Basiliella barrandi as very few Decorah formation trilobites gets that big and have sizable genal spines.
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 9.8 mm
- Exposure Time 1/50
- f Aperture f/3.1
- ISO Speed 80
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