Isorthoceras sociale (Hall 1877)
The plate measures 11x9x3cm.
Elgin Member
Maquoketa Formation
Richmondian
Late Ordovician
Found at a roadcut near Graf, Iowa
Gift from Minnbuckeye.
Photo Information
- Taken with Canon Canon PowerShot SX230 HS
- Focal Length 5 mm
- Exposure Time 1/30
- f Aperture f/3.1
- ISO Speed 125
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