LJ-Geology
Thrust Fault in Carbonates (Bellevue Member, McMillan Formation, Maysville, Kentucky, USA)1 2
Ramp in minor thrust fault set in the limestone-dominant Bellevue Member of the McMillan Formation in the Upper Ordovician rocks of Kentucky.
Thrust faults are compressional features that push, or "thrust," older rocks over younger strata at a relatively low angle (this is a minor example only limited to one member within a formation).
This is a ramp where the fault "ramps" up, cutting through the strata at a low angle. When it reaches an area that is easier to propagate though (such as a small sequence dominated by softer shales) it will flatten out to an appropriately named "flat."
The Bellvue Member is comprised of thin to thick bedded gray fossiliferous limestones (the larger ledges in the picture above) and classified as storm deposits or tempestites.
In between are relatively thin gray, thinly bedded shales beneath the large limestone ledges.
Stratigraphy: Bellevue Member, McMillan Formation, Maysvillian Stage, Covington Subseries, Cincinnatian Series, Late (upper) Ordovician.
Locality: southwest side of road cut along U.S Highway 92, south of Lawrence Creek and Germantown Road, east-northeast of Maysville, north Mason County, Kentucky, USA (38°40'05.8" North latitude, 83°48'05.6" West longitude).
* * *
Cincinnatian Lithostratigraphy:
Weir, G. W., W. L. Peterson, W. C. Swadley, and J. Pojeta. 1984. Lithostratigraphy of Upper Ordovician strata exposed in Kentucky. United States Geological Survey Professional Paper 1151-E:1–121.
Peck, J.H., 1966, Upper Ordovician formations in the Maysville area, Kentucky: USGS Bulletin 1244-B, 30 p.
Thrust Fault Tectonics:
Berberian Manuel, Master “blind” thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics. 1995. Tectonophysics
Volume 241, Issues 3–4, 30 January 1995, Pages 193-195, 197, 199-224
K. R. McClay, Thrust Tectonics, 1992, print book.
Thrust Fault in Carbonates (Bellevue Member, McMillan Formation, Maysville, Kentucky, USA)1 2
Ramp in minor thrust fault set in the limestone-dominant Bellevue Member of the McMillan Formation in the Upper Ordovician rocks of Kentucky.
Thrust faults are compressional features that push, or "thrust," older rocks over younger strata at a relatively low angle (this is a minor example only limited to one member within a formation).
This is a ramp where the fault "ramps" up, cutting through the strata at a low angle. When it reaches an area that is easier to propagate though (such as a small sequence dominated by softer shales) it will flatten out to an appropriately named "flat."
The Bellvue Member is comprised of thin to thick bedded gray fossiliferous limestones (the larger ledges in the picture above) and classified as storm deposits or tempestites.
In between are relatively thin gray, thinly bedded shales beneath the large limestone ledges.
Stratigraphy: Bellevue Member, McMillan Formation, Maysvillian Stage, Covington Subseries, Cincinnatian Series, Late (upper) Ordovician.
Locality: southwest side of road cut along U.S Highway 92, south of Lawrence Creek and Germantown Road, east-northeast of Maysville, north Mason County, Kentucky, USA (38°40'05.8" North latitude, 83°48'05.6" West longitude).
* * *
Cincinnatian Lithostratigraphy:
Weir, G. W., W. L. Peterson, W. C. Swadley, and J. Pojeta. 1984. Lithostratigraphy of Upper Ordovician strata exposed in Kentucky. United States Geological Survey Professional Paper 1151-E:1–121.
Peck, J.H., 1966, Upper Ordovician formations in the Maysville area, Kentucky: USGS Bulletin 1244-B, 30 p.
Thrust Fault Tectonics:
Berberian Manuel, Master “blind” thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics. 1995. Tectonophysics
Volume 241, Issues 3–4, 30 January 1995, Pages 193-195, 197, 199-224
K. R. McClay, Thrust Tectonics, 1992, print book.