ⓘ Old Port Formation. The Devonian Old Port Formation is a mapped bedrock unit in Pennsylvania, USA. Details of the type section and of stratigraphic nomenclature ..

Old Port Formation

ⓘ Old Port Formation

The Devonian Old Port Formation is a mapped bedrock unit in Pennsylvania, USA. Details of the type section and of stratigraphic nomenclature for this unit as used by the U.S. Geological Survey are available on-line at the National Geologic Map Database. Current nomenclature usage by U.S. Geological Survey restricts the name Old Port Formation to Pennsylvania, but correlative units are present in adjacent states.


1. Description

The Old Port Formation consists of several members with varying lithologies, which are in ascending stratigraphic order: New Creek Member limestone, Corriganville Member limestone, Mandata Member shale, Shriver Member cherty limestone, and Ridgeley Member sandstone. Where the Shriver Chert does not occur it may be replaced by the Licking Creek Limestone. It was originally combined from the Helderberg Group and Oriskany Group by Conlin and Hoskins in 1962 to form a single Formation with the above members.


1.1. Description Ridgeley Member

The Ridgeley Member was first described as a member of the Oriskany Formation by Swartz and others 1913, as a calcareous sandstone which passes into an arenaceous limestone. It is still mapped as part of the Oriskany Group in New Jersey.

The type locality is at the town of Ridgeley, Mineral County, West Virginia.

The sandstone of the Ridgeley Member has been extensively mined due to its very pure quartz suitable for glass. The glass derived from the sandstone was used for lenses on the Hubble Space Telescope.

A separate formation, the Oriskany Sandstone, is a lateral equivalent of the Ridgeley Member, but bounded above and below by unconformities.


1.2. Description Shriver Member

The Shriver Member, or Shriver Chert, was first described as a member of the Oriskany Formation by Swartz and others 1913, as dark siliceous shale with much black impure chert in nodules or layers of nodules. It is named after Shriver Ridge the type locality, Allegany County, Maryland, and was originally mapped as the basal unit of the Oriskany Formation.

In Maryland and West Virginia, the Shriver is mapped as part of the Helderberg Group.

In central Pennsylvania it is mapped as part of the Old Port Formation.

In New Jersey it is mapped as the middle unit of the Oriskany Group.


1.3. Description Mandata Member

The Mandata Shale of the Helderberg Group was first introduced by F. M. Swartz in 1938, mainly with reference to the overlying Licking Creek Limestone. The type locality is about 0.25 miles south of Mandata, Pennsylvania, on Route 225.


1.4. Description Corriganville Member

The Corriganville Limestone was first described by J. W. Head in 1972 as part of the Helderberg Group in Allegany County, Maryland, as a gray limestone with chert. C. R. Wood first mapped it as part of the Old Port Formation in Pennsylvania.

The type locality is a railroad cut 0.3 mi southeast of Corriganville, Alleghany County, Maryland.


1.5. Description New Creek Member

The New Creek Member was first described by Bowen only as a limestone that is replaced by the Elbow Ridge Sandstone near Hancock, Maryland. Bowen later described it as a massive limestone overlying the Keyser Formation. C. R. Wood first mapped it as part of the Old Port Formation in Pennsylvania.


1.6. Description Licking Creek Member

The Licking Creek Limestone of the Helderberg Group was first introduced by F. M. Swartz in 1938, and was described more fully in 1939. The unit consists of layers and nodules of black chert interbedded with light-gray crystalline limestone. The type locality is a bluff on the south side of Licking Creek, about one mile east of Warren Point, Franklin County, Pennsylvania.


2. Fossils

Brachiopods are occasionally abundant as casts in the Ridgeley Member.

The brachiopods Costispirifer arenosus, Beachia immatura, Leptocoelia flabellites, Metaplasia paucicostata, Plicoplasia tribuarius, and Chonetes hudsonicus are present in the Shriver Member around the type locality of Shriver Ridge. Ostracods are also present in the Shriver Member.

The Old Port Formation contains conodonts.


3. Notable Exposures

  • U.S. Route 30 Everett Bypass roadcut through Warrior Ridge north of Everett
  • Two exposures in Everett, Pennsylvania
  • Old quarry in Tyrone, Pennsylvania, west of Sink Run and along U.S. Route 22
  • Another exposure along business Route 30 on the west side of Everett pictured above
  • The Sinnett-Thorn Mountain Cave System is developed in the Keyser Formation and overlying New Creek and Corriganville Limestone Members

See also type localities listed in subsections above.


4. Age

Relative age dating of the Old Port places it in the Lower Devonian period. It rests conformably atop the Keyser Formation and usually unconformably below the Needmore Formation or below the Onondaga Formation.

  • Floresta Formation Old Port Formation Lithostratigraphische Einheiten Deutschlands: Klerf Formation Willwerath at Klerf Formation at Fossilworks
  • with Tonoloway Formation is probably conformable, but sharp enough to suggest an unconformity. Upper contact with the Old Port Formation is conformable
  • Port Talbot ˌpɔːrt ˈtɔːlbət UK also pɔːr - pə - - ˈtælbət, - ˈtɒlbət is a town and community in the county borough of Neath Port Talbot, Wales. It
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  • Mifflintown Formation the Wills Creek Formation the Tonoloway Formation the Keyser Formation the Old Port Formation the Onondaga Formation and the
  • Local Agency Formation Commissions. Archived from the original Word on February 21, 2013. Retrieved August 25, 2014. City Council Port Hueneme, CA
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  • Places Registration: Port Deposit PDF Maryland Historical Trust. Retrieved 2016 - 01 - 01. The formation is known by geologists as Port Deposit Gneiss. This
  • valley near Avon, New York, and at Port Colborne, Ontario, where the old valley forms a harbor on Lake Erie. The formation is broken by the only major fault
  • switches formation The Sentinel. Retrieved 20 July 2009. McCrory returns to Vale on loan BBC Sport. 24 August 2009. Retrieved 4 August 2009. Port Vale
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  • The Silurian Bloomsburg Formation is a mapped bedrock unit in Pennsylvania, New Jersey, New York and Maryland. It is named for the town of Bloomsburg
  • The history of Port Vale F.C., an English association football club based in Stoke - on - Trent, began with the formation of the club, which is officially

  • The 1925 26 season was Port Vale s seventh consecutive season of football 20th overall in the English Football League. They improved on their previous
  • Onondaga Old Port Formation occurs south of the Hamilton Group and the Keyser Tonoloway Formation Undivided occurs south of the Onondaga Old Port Formation The
  • its cargo sub - port at Philadelphia - about 44 of all troops and 34 of all cargo passing through army ports of embarkation. The formation and development
  • for example, Cherry Run of 1951 The Licking Creek Member of the Old Port Formation was first described a mile east of Warren Point. Hancock Quadrangle
  • The Port Authority of New York and New Jersey PANYNJ is a joint venture between the U.S. states of New York and New Jersey, established in 1921 through
  • The Port Jervis Line is a predominantly single - track commuter rail line running between Suffern and Port Jervis, in the U.S. state of New York. At Suffern
  • The 1989 90 season was Port Vale s 78th season of football in the English Football League, and first 33rd overall season back in the Second Division
  • anticline. The bedrock along the axis is the Devonian Onondaga Formation and Old Port Formation consisting primarily of sandstone. The crest of the hill is
  • along with wharves used to transport produce down the Onkaparinga River to Port Noarlunga via barge. The town still has a stone bridge across the Onkaparinga
  • Ports Toronto PT formerly known as the Toronto Port Authority TPA is responsible for the management of the harbour of Toronto, Ontario, Canada, and
  • The Confederation of Cinque Ports sɪŋk pɔːrts is a historic series of coastal towns in Kent, Sussex and Essex. It was originally formed for military

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