Hallopora sp. (Bassler 1911) ?
By Ludwigia
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Upper right. Plate measures 7x4cm. From a site on the Credit river in Caledon, On., Canada. Llandoveryian, Lower Silurian, Whirlpool Formation.
Photo Information
- Taken with Panasonic DMC-FS3
- Focal Length 5.5 mm
- Exposure Time 10/1600
- f Aperture f/2.8
- ISO Speed 100
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