Strictoporellina cribrosa uncommon Decorah Formation. Least common of the porous frondose types. Pretty solid flat with pores ridden it. No other variability in shapes.
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- Taken with EASTMAN KODAK COMPANY KODAK DX7590 ZOOM DIGITAL CAMERA
- Focal Length 8.5 mm
- Exposure Time 1/40
- f Aperture f/3.0
- ISO Speed 100
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