Catskill Formation


















































Catskill Formation
Stratigraphic range: Devonian

Catskill1.jpg
Outcrop of the Irish Valley Member of the Catskill Formation along the Horseshoe Curve, Blair County, Pennsylvania

Type sedimentary
Underlies
Rockwell Formation, Huntley Mountain Formation, Pocono Formation, Spechty Kopf Formation
Overlies
Foreknobs Formation, Lock Haven Formation, Trimmers Rock Formation
Thickness Up to 10,000 ft (3,000 m)
Lithology
Primary Sandstone
Other
Siltstone, shale
Location
Region Appalachian Mountains
Country
 United States
Extent
 Pennsylvania,  New York (state)
Type section
Named for
Catskill Mountains, New York

The Devonian Catskill Formation or the Catskill Clastic wedge is a unit of mostly terrestrial sedimentary rock found in Pennsylvania and New York. Minor marine layers exist in this thick rock unit (up to 10,000 feet (3,000 m)). It is equivalent to the Hampshire Formation of Maryland, West Virginia, and Virginia.


The Catskill is the largest bedrock unit of the Upper Devonian in northeast Pennsylvania and the Catskill region of New York, from which its name is derived. The Pocono Mountains of Pennsylvania are largely underlain by this unit as well. The rocks of the Catskill are predominantly red sandstone indicating a large scale terrestrial deposition during the Acadian orogeny. Many beds are cyclical in nature, preserving the record of a dynamic environment during its approximately 20 million years of deposition.




Contents






  • 1 Depositional environment


  • 2 Glacial Erosion


    • 2.1 Signs of Glaciation




  • 3 Members


    • 3.1 Eastern Pennsylvania


    • 3.2 Central Pennsylvania




  • 4 References


  • 5 External links





Depositional environment




Cut slab of the Catskill Formation from the Coleman Quarry of the Endless Mountain Stone Company, Susquehanna County, Pennsylvania, showing mud clasts within sandstone




Point bar deposits in the Catskill Formation (Devonian) near North Bend, PA.


During the Devonian period, the Catskill Delta was formed by a series of river deltas and otherwise marshy terrain. This terrain was sandwiched between the epicontinental Kaskaskia Sea in central North America and the now-vanished Acadian Mountains. Erosion brought sediment from the mountain westwards into the sea, forming the deltas.


Eventually the Delta formation was buried and transformed into sandstone, which was then revealed in places when the Catskill and Appalachian Mountains were formed at a later date. This transformation and uncovering is the primary reason why the Catskill Delta is notable in the present; western Pennsylvania's petroleum was formed as a consequence. This was the first major oil region to be developed.


The Catskill was once considered to be related to the Old Red Sandstone, but in actuality the two are only coincidentally similar. Both formed at approximately the same time, and under similar conditions: to the north of the Acadian Mountains were the Caledonian Mountains, and a similar region of marsh and river delta formed there.



Glacial Erosion


Though both mountain ranges were formed during the Acadian orogeny, the Catskill Mountains, unlike the Appalachian Mountains underwent glacial erosion.[1] Much of what formed the Catskills as they stand today is a result of the Wisconsin glaciation which ended only about 12,000 years ago.[2]



Signs of Glaciation


There are many signs of the Glacial period event which carved the current day Catskill Mountains.


These markers include:



  • Glacial Eratics such as the Devils Tombstone[2]

  • Striations

  • "Dance Floors" such as Pratt Rock[2]

  • Terminal moraines



Members



Eastern Pennsylvania


Towamensing, Walcksville, Beaverdam Run, Long Run, Packerton, Poplar Gap, Sawmill Run, Berry Run, Clarks Ferry, and Duncannon.



Central Pennsylvania


Irish Valley, Sherman Creek, Buddys Run, Clarks Ferry, and Duncannon.






Geologic cross section of upper to middle Devonian strata from Cherry Valley, New York, south-southwest across the Allegheny Plateau and then along the Ridge-and-Valley Appalachians to Tennessee. The Catskill Formation is at the top.[3]





References





  1. ^ Rich, John Lyon (1906). "Local Glaciation in the Catskill Mountains". The Journal of Geology. 14 (2): 113–121..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  2. ^ abc Titus, Robert (1996). The Catskills in the Ice Age. Flieschmanns, New York: Purple Mountain Press. pp. 14–29. ISBN 0-935796-77-0.


  3. ^ Boughton, Carol J.; McCoy, Kurt J. (2006). "Hydrogeology, Aquifer Geochemistry, and Ground-Water Quality in Morgan County, West Virginia". U.S. Geological Survey. Scientific Investigations Report 2006-5198.




External links


  • Depositional environments in the Catskill Clastic Wedge








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