Runzelmarken & mudcracks (upper Cave Branch Member, Slade Formation, Upper Mississippian; Clack Mountain Road Outcrop, south of Morehead, Kentucky, USA) 4

            Runzelmarken and mudcracks in limestone in the Mississippian of Kentucky, USA.

This slab is eroded from an outcrop of Upper Mississippian Slade Formation in Kentucky.  The unit was formerly known as the Newman Limestone ("They always change the names to protect the innocent!").  Slade Formation limestones are shallow ocean deposits.

Seen here is a a talus piece of limestone from the upper Cave Branch Member, which is a gray shale-rich interval having interbedded thin, fine-grained limestones deposited in an ancient intertidal environment.
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From Ettensohn & Lierman (1992):
[The] overlying parts of the Cave Branch Member here include dark-gray shales and interbedded calcilutites, which contain laminae, flaser-beds, mudcracks, runzelmarken, as well as vertical and horizontal burrows.  This part of the Cave Branch represents a transgressive tidal mud-flat deposit on the leading edge of an early to middle Chesterian transgressing sea represented by the upper Cave Branch-through-Maddox Branch members of the Slade, all of which are exposed here.  The dark-gray shales in tidal parts of the Cave Branch probably represent reworked soils from the underlying [paleosol] deposit.
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The numerous small structures on this bedding plane may what is referred to above as "runzelmarken", also known as "wrinkle marks".  I know next to nothing about runzelmarken, but structures identified as such appear to have multiple specific origins.

The prominent ridge at left appears to be a mudcrack infilling.

Stratigraphy: upper Cave Branch Member, Slade Formation, Upper Mississippian

Locality: roadcut next to the Clack Mountain Road-Route 519 intersection, south of Morehead, Kentucky, USA (vicinity of 38° 07’ 41.87” North latitude, 83° 24’ 47.04” West longitude)

   

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Taken on: March 11, 2018

Tags:

runzelmarken

wrinkle

Cave

Branch

Member

Slade

Formation

Mississippian

Clack

Mountain

Road

Morehead

Kentucky

paleosol

paleosols

shale

limestone « less

Sets appears in: • Kentucky Rocks & Fossils • Slade Formation (Upper Mississippian; Kentucky, USA) more » • Mississippian Rocks & Fossils « less

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