Bryozoan-encrusted crinoid stem (Fort Payne Formation, Lower Mississippian; Rt. 61 roadcut, north of Burkesville, Kentucky, USA) 1

            Bryozoan-encrusted crinoid stem 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 sessile, benthic, filter-feeding, stalked echinoderms.  Crinoids are relatively common in the marine fossil record.  They are also alive today, but are generally uncommon in modern oceans.  A crinoid is essentially a starfish-on-a-stick.  The stick, or stem, is composed of numerous stacked columnals, like small poker chips.  Stems and individual columnals are the most commonly encountered crinoid fossils in the field.  Intact, fossilized crinoid heads (crowns, calices, cups) are unusual.  Why?  Upon death, the crinoid body starts disintegrating very rapidly.  The soft tissues holding the skeletal pieces together decay and the skeleton falls apart.

Classification: Animalia, Echinodermata, Crinoidea

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

Locality: Burkesville North Outcrop - Route 61 roadcut at milepost 23, way north of Burkesville, Kentucky, USA. (36° 53’ 48.51” North latitude, 85° 25’ 41.08” West longitude)

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Taken on: March 13, 2018

Tags:

bryozoan

bryozoans

encrusters

encrusting

encrusted

crinoid

crinoids

stem

stems

fossil

fossils

Fort

Payne

Formation

Osagean

Mississippian

Burkesville

Kentucky « less

Sets appears in: • Kentucky Rocks, Minerals, Fossils • Mississippian Rocks, Minerals, Fossils more » • Fort Payne Formation (Lower Mississippian; Kentucky-Tennessee, USA) • Crinoid & Eocrinoid Fossils « less

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