Lock Haven Formation Explained

Lock Haven Formation
Type:sedimentary
Age:Devonian
Prilithology:siltstone, shale, sandstone
Otherlithology:conglomerate
Namedfor:Lock Haven, Pennsylvania
Namedby:Faill and Wells, 1977[1]
Region:Appalachian Mountains
Country:United States
Unitof:Susquehanna Group
Subunits:lower shaly member, upper sandy member, Minnehaha Springs Member
Underlies:Catskill Formation
Overlies:Brallier Formation
Extent:Pennsylvania

The Lock Haven Formation is a Devonian mapped bedrock unit in Pennsylvania, in the Appalachian Mountains of the United States.

Description

The Lock Haven is gray to green-brown sandstone, siltstone, and shale and is over 400 million years old. It is located in northcentral Pennsylvania.[2] [3]

Stratigraphy

The Lock Haven may underlie various members of the Catskill Formation, although it may be a lateral equivalent of the Sherman Creek or Irish Valley Members of the Catskill. It is also a lateral equivalent of the Foreknobs Formation and underlying Scherr Formation. The Brallier Formation usually underlies the Lock Haven.[4]

The Minnehaha Springs Member (originally proposed as a member of the Scherr Formation) is a "clastic bundle" consisting of interbedded medium gray siltstone and olive gray shale with some grayish-red siltstone and shale and some sandstone. It is interpreted as turbidites.[5] This member is proposed to define the base of the Lock Haven Formation.[6]

Notable Exposures

See also

Notes and References

  1. Faill, R.T., and Wells, R.B., 1977, Bedrock geology and mineral resources of the Salladasburg and Cogan Station quadrangles, Lycoming County, Pennsylvania, IN Faill, R.T., Wells, R.B., and Sevon, W.D., Geology and mineral resources of the Salladasburg and Cogan Station quadrangles, Lycoming County, Pennsylvania: Pennsylvania Geological Survey Topographic and Geologic Atlas, 4th series, 133cd, p. 32-44, scale 1:24,000
  2. Book: Owlett, Steven E. . Seasons Along The Tiadaghton: An Environmental History of the Pine Creek Gorge . 1993 . Of Brachiopods and Glaciers . 27–38 . 1st . Interprint . Petaluma, California . 0-9635905-0-2 .
  3. Web site: Map 67: Tabloid Edition Explanation . http://wayback.archive-it.org/all/20090225124146/http://www.dcnr.state.pa.us/topogeo/pub/map/pdfs/map067_tabloid_exp.pdf . dead . February 25, 2009 . Pennsylvania Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey . PDF.
  4. Stratigraphic correlation chart of Pennsylvania, T. M. Berg, M. K. McInerney, J. H. Way, and D. B. MacLachlan. 1983; 3rd printing, revised, 1993. 1 sheet, 42" x 58", plus 2 p. addendum.
  5. Lyke, W.L., 1986, The stratigraphy, paleogeography, depositional environment, faunal communities, and general petrology of the Minnehaha Springs Member of the Scherr Formation: Southeastern Geology, v. 26, no. 3, p. 173-192.
  6. Warne, A.G., and McGhee, G.R., Jr., 1991, Stratigraphic subdivisions of the Upper Devonian Scherr, Foreknobs, and Lock Haven Formations near the Allegheny Front of central Pennsylvania: Northeastern Geology, v. 13, no. 2, p. 96-109.
  7. Web site: Atlas of Preliminary Geologic Quadrangle Maps of Pennsylvania: Tiadaghton . https://wayback.archive-it.org/all/20090225124141/http://www.dcnr.state.pa.us/topogeo/map61/tiadaghton.pdf . dead . February 25, 2009 . 2008-08-05 . Berg, T. M. . Pennsylvania Department of Conservation and Natural Resources, Bureau of Topographic and Geologic Survey . 1981 . PDF.
  8. Book: 71st Annual Field Conference of Pennsylvania Geologists (field trip guide book) . 2006 . Inners . J. D. . The Haystacks, "Ricketts Folly," and The End of the World: Geology of the Glaciated Allegheny High Plateau, Sullivan, Luzerne, and Columbia Counties, Pennsylvania . Fleeger . G. M. .

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lock Haven Formation".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.