Image: Pfeifer Shale concretions 20151226 123544
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Description: Flattened spheroid, discoid, or "pillow rock" limestone concretions of the Pfeifer Shale, like those of the Fairport Chalk prove that the Fencepost bed is nearby.
Title: Pfeifer Shale concretions 20151226 123544
Credit: Own work
Author: IveGoneAway
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License: CC BY-SA 4.0
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