File:Concretion in gray shale (Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 5.jpg

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English: Concretion in gray shale in the Mississippian of Kentucky, USA.

The Fort Payne Formation of southern Kentucky & Tennessee is a shale and limestone succession of Early Mississippian age. Fossils are common to abundant in many intervals. The unit is dominated by crinoids, which are stalked, sessile, benthic, filter-feeding echinoderms (see: <a href="https://www.flickr.com/photos/jsjgeology/albums/72157647779397286">www.flickr.com/photos/jsjgeology/albums/72157647779397286</a>).

Seen here is the gray shale-dominated lower portion of the Fort Payne Formation west of Burkesville, Kentucky. Some non-shale horizons are present, as are some ellipsoidal to lenticular concretions of various sizes.

Stratigraphy: Fort Payne Formation, Osagean Stage, upper Lower Mississippian

Locality: roadcut along Route 90, just west of Burkesville, Kentucky, USA (36° 47’ 58.81” North latitude, 85° 22’ 58.64” West longitude)
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Author James St. John

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