File:Eroded siltstone) (Licking River gravel bar, Licking County, Ohio, USA).jpg

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English: Differential weathering and differential erosion are processes involving soft rocks weathering/eroding quickly and hard rocks weathering/eroding slowly. Different portions of an individual rock will weather and erode and different rates, depending on the durability and chemical reactivity of individual components (grains, minerals).

This siltstone sample kinda looks like a fossil, but it's not. Such objects are called "pseudofossils". One of my students asked if this was a trilobite. Unfortunately - no. It's a pseudotrilobite !

Stratigraphic provenance: likely from local Lower Mississippian siliciclastics (Cuyahoga Formation or Logan Formation)

Locality: loose clast atop gravel bar, northern side of the Licking River, just east of Stadden Bridge Road, central Madison Township, east-central Licking County, east-central Ohio, USA (40° 03' 32.7" North latitude, 82° 20' 08.8" West longitude)
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Source https://www.flickr.com/photos/47445767@N05/49954157801/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49954157801. It was reviewed on 22 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 October 2020

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current18:36, 22 October 2020Thumbnail for version as of 18:36, 22 October 20201,239 × 1,806 (2.08 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49954157801/ with UploadWizard

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