By Tetradium
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Hesperorthis tricenaria. This is upper Platteville formation which is very abundant and the most easily identified brachiopod from that layer - diversity of fossils in upper platteville while abundant, tend to be very low in diversity. Among brachiopods of upper platteville, mainly Strophomena filitexta, Hesperorthis tricenaria, Oepikina minnesotensis, Rafinesquina sp, and maybe Oepikina inquassa is practically the only brachiopod species found in upper Platteville.
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 7.1 mm
- Exposure Time 1/30
- f Aperture f/2.9
- ISO Speed 80
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