Mississippian / St. Joe ?
Features of interest
Two large carbonate mounds originally thought to be carbonate buildups, but now considered olistoliths. Tripolitic chert in upper section of outcrop. Fracture/fault with very small offset. Unfaulted triangulation with nearby wells indicates outcrop has St. Joe at base (supported by shale occurrence) and Lower Boone above, making this tripolite a rare occurrence in the Lower Boone.
Lithology present
Support material available
Two large carbonate mounds originally thought to be carbonate buildups, but now considered olistoliths. Tripolitic chert in upper section of outcrop. Fracture/fault with very small offset. Unfaulted triangulation with nearby wells indicates outcrop has St. Joe at base (supported by shale occurrence) and Lower Boone above, making this tripolite a rare occurrence in the Lower Boone.
Lithology present
Limestone, chert, shale
State/County
State/County
AR / Benton County
Access
AR412 at Kincheloe Road
Photos (15 iPhone, 48 Nikon with scale), partial photo montage, PPT of stratigraphic position from nearby wells, seismic data acquired at foot of outcrop. UArk MS theses: Sandra Chandler (2001), Matt Ruggeri (in progress), John Gist (in progress). Site published in Leading Edge (Liner and Liner, 1995).
Site visit history
C. Liner 11/14/2012, 12/28/2013, 06/29/2015 (seismic line) |
| St. Joe (?) and Lower Boone with interpreted olistolith. Scale bar (orange) is 4 ft. |
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| Cross section through L15 and nearby wells establishing outcrop stratigraphic position as probable St. Joe and Lower Boone. |
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