File:Calamites (fossil plant) (Breathitt Group, Middle Pennsylvanian; Jackson North Outcrop - Rt. 15 roadcut, Breathitt County, Kentucky, USA) 1.jpg

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English: Calamites - fossil plant stem from the Pennsylvanian of Kentucky, USA. (~6.4 centimeters across at its widest)

Seen here is a Calamites pith cast. The central portion of an ancient sphenophyte stem has been filled with sediments - in this case, sand. This fossil preservation style is called a cast. The black material is carbonized plant matter.

The sphenophytes are a group of plants with only one surviving genus in the Holocene - Equisetum. Calamites is an easily-recognizable stem genus - it consists of a longitudinally-ridged axis having regularly-spaced nodes (see elsewhere in this photo album).

Classification: Plantae, Sphenophyta, Equisetales, Calamitaceae

Stratigraphy: construction talus from the Hyden Formation or Pikeville Formation, Breathitt Group, Middle Pennsylvanian

Locality: construction rubble from Jackson North outcrop - large roadcut on the eastern side of new Rt. 15, just south of the southbound old Rt. 15-new Rt. 15 split, north of the town of Jackson, north-central Breathitt County, eastern Kentucky, USA (~37° 34’ 53.95” North latitude, ~83° 23’ 07.99” West longitude)
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Source https://www.flickr.com/photos/47445767@N05/40307460023/
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@N05/40307460023. It was reviewed on 4 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

4 November 2022

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current21:48, 4 November 2022Thumbnail for version as of 21:48, 4 November 20222,058 × 2,152 (3.93 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/40307460023/ with UploadWizard

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