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Keyser Formation
The Late Silurian to Early Devonian Keyser Formation is a mapped limestone bedrock unit in Pennsylvania, Maryland, Virginia, and West Virginia. Description The Keyser is a nodular limestone overlain by thick- and thin-bedded limestone and laminated limestone at its type locality in Keyser, West Virginia. In central Pennsylvania, the basal "calico" limestone is a fossiliferous, medium-light- to medium-gray very thick bedded calcilutite containing numerous small irregular patches of clear calcite. The abundantly fossiliferous, nodular limestone at the base overlies the "calico". Overlying this is 5 to 6 m of fragmental calcarenite containing abundant crinoid columnals. Above the calcarenite is 6 m of fossiliferous, banded calcisiltite. The uppermost 15 m is a sequence alternating between laminated, stromatolitic calcisiltite, and calcilutite and calcisiltite that are argillaceous and fossiliferous. Depositional environment The depositional environment of the Keyser is interpret ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fulton County, Pennsylvania
Fulton County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 14,556, making it the fourth-least populous county in Pennsylvania. Its county seat is McConnellsburg. The county was created on April 19, 1850, from part of Bedford County and named for inventor Robert Fulton. Geography According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.1%) is water. It is in the watershed of the Chesapeake Bay and, although most of the county is drained by the Potomac River, some northern and northeastern areas are drained by the Juniata River into the Susquehanna River. It has a humid continental climate (''Dfa''/''Dfb'') and average monthly temperatures in McConnellsburg range from 29.2 °F in January to 73.0 °F in July Adjacent counties * Huntingdon County, Pennsylvania, Huntingdon County (north) * Franklin County (east) *Washington County, Maryland (south) * Allegany County, Maryland (southwest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bedrock
In geology, bedrock is solid Rock (geology), rock that lies under loose material (regolith) within the crust (geology), crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bedrock is often called an outcrop. The various kinds of broken and weathered rock material, such as soil and subsoil, that may overlie the bedrock are known as regolith. Engineering geology The surface of the bedrock beneath the soil cover (regolith) is also known as ''rockhead'' in engineering geology, and its identification by digging, drilling or geophysics, geophysical methods is an important task in most civil engineering projects. Superficial deposition (geology), deposits can be very thick, such that the bedrock lies hundreds of meters below the surface. Weathering of bedrock Exposed bedrock experiences weathering, which may be physical or chemical, and which alters the structure of the rock to leave ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Geological Survey
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Vale, Maryland
LaVale is a census-designated place (CDP) in Allegany County, Maryland, United States. It is part of the Cumberland, MD-WV Metropolitan Statistical Area. The population was 3,551 at the 2010 census. Geography LaVale is located at , in the shadow of Haystack Mountain. To the east is Cumberland and the very scenic Narrows, a water gap between Haystack Mountain to the south and Wills Mountain to the north. To the west is Piney Mountain and Frostburg. LaVale is on the Old National Pike. LaVale is a business center that contains the largest concentration of retail and the only indoor shopping mall, Country Club Mall, in the Cumberland metro area. The LaVale Tollgate House was listed on the National Register of Historic Places in 1971. According to the United States Census Bureau, the CDP has a total area of , all land. Demographics As of the census of 2000, there were 4,613 people, 1,924 households, and 1,377 families residing in the CDP. The population density was . There wer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allegany County, Maryland
Allegany County is located in the northwestern part of the U.S. state of Maryland. As of the 2020 census, the population was 68,106. Its county seat is Cumberland. The name ''Allegany'' may come from a local Lenape word, ''welhik hane'' or ''oolikhanna,'' which means 'best flowing river of the hills' or 'beautiful stream'. A number of counties and a river in the Appalachian region of the U.S. are named ''Allegany'', ''Allegheny'', or ''Alleghany''. Allegany County is part of the Cumberland, MD-WV Metropolitan Statistical Area. It is a part of the Western Maryland " panhandle". History The western part of Maryland (including the present Allegany County) was originally part of Prince George's County when Maryland was formed in 1696. This county included six current counties, and by repeated splitting, new ones were generated: Frederick from Prince George's in 1748;Bentley, Elizabeth Petty. ''County Courthouse Book.'' Baltimore, Md.: Genealogical Publishing Co., 2009, p. 128. an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corriganville, Maryland
Corriganville is an unincorporated community and census-designated place (CDP) in Allegany County, Maryland, United States. As of the 2010 census it had a population of 455. Corriganville is part of the Cumberland, MD-WV Metropolitan Statistical Area. Geography Corriganville lies north of Cumberland at the confluence of Wills Creek and Jennings Run. Maryland Route 36 passes through Corriganville, and Maryland Route 35 heads north from there to Ellerslie. Demographics Cumberland Bone Cave In 1912, workers excavating a cut for the Western Maryland Railway broke into a partly filled cave along the western slope of Wills Mountain, near Corriganville. A local naturalist, Raymond Armbruster, observed fossil bones among the rocks that had been blasted loose and were being removed from the cut. Armbruster notified paleontologists at the Smithsonian Institution, and James W. Gidley began excavating that same year. The cave later became known as the Cumberland Bone Cave. Betwee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lycoming County, Pennsylvania
Lycoming County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 114,188. Its county seat is Williamsport. Lycoming County comprises the Williamsport metropolitan statistical area. About northwest of Philadelphia and east-northeast of Pittsburgh, Lycoming is Pennsylvania's largest county by area. History Formation of the county Lycoming County was formed from Northumberland County on April 13, 1795. The county was larger than it is today. It took up most of the land that is now north central Pennsylvania. The following counties have been formed from land that was once part of Lycoming County: Armstrong, Bradford, Centre, Clearfield, Clinton, Indiana, Jefferson, McKean, Potter, Sullivan, Tioga, Venango, Warren, Forest, Elk and Cameron. Lycoming County was originally named Jefferson County in honor of Thomas Jefferson. This name proved to be unsatisfactory. The name change went through several steps. First a change to Lycom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jersey Shore, Pennsylvania
Jersey Shore is a borough in Lycoming County, Pennsylvania, United States. It is on the West Branch Susquehanna River, west by south of Williamsport. It is part of the Williamsport, Pennsylvania Metropolitan Statistical Area. In the past, Jersey Shore held farms, railroad shops, cigar factories, a foundry, and a large silk mill. The population was 4,158 at the 2020 census. History Jersey Shore was incorporated as a borough on March 15, 1826. The history of Jersey Shore begins about 50 years before it was incorporated and on the opposite bank of the West Branch Susquehanna River in what is now Nippenose Township. Colonel John Henry Antes arrived in 1772 and established a homestead along the banks of Antes Creek. Antes also built a gristmill and his fortified home, Fort Antes, provided a safe haven for the early settlers against raids conducted by Loyalist and Indian forces during the American Revolution. Settlers who had sought refuge at Fort Antes and had returned to the rig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selinsgrove, Pennsylvania
Selinsgrove is the largest borough in Snyder County, Pennsylvania, United States. The population is estimated to be 5,761 for the 2020 Census. Selinsgrove is geographically located in the middle of the Susquehanna River Valley in Central Pennsylvania, along U.S. Routes 11 and 15, north of Harrisburg and southwest of Sunbury. It is the home of Susquehanna University. History Selinsgrove was founded in 1787 by Captain Anthony Selin, who fought in the American Revolution. The Penns Creek Massacre on October 16, 1755 was the first of a series of deadly raids on Pennsylvania settlements by Native Americans allied with the French in the French and Indian War. A marker on the bank of Penns Creek north of Selinsgrove commemorates the massacre of 14 settlers and the capture of 11 more. In response to this and other Indian actions that day, Fort Augusta, Sunbury, Pennsylvania, the largest of Pennsylvania's frontier forts, was built in 1756 as a result of this conflict. Selinsgro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unconformity
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger layer, but the term is used to describe any break in the sedimentary geologic record. The significance of angular unconformity (see below) was shown by James Hutton, who found examples of Hutton's Unconformity at Jedburgh in 1787 and at Siccar Point in 1788. The rocks above an unconformity are younger than the rocks beneath (unless the sequence has been overturned). An unconformity represents time during which no sediments were preserved in a region or were subsequently eroded before the next deposition. The local record for that time interval is missing and geologists must use other clues to discover that part of the geologic history of that area. The interval of geologic time not represented is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Depositional Environment
In geology, depositional environment or sedimentary environment describes the combination of physical, chemical, and biological processes associated with the deposition of a particular type of sediment and, therefore, the rock types that will be formed after lithification, if the sediment is preserved in the rock record. In most cases, the environments associated with particular rock types or associations of rock types can be matched to existing analogues. However, the further back in geological time sediments were deposited, the more likely that direct modern analogues are not available (e.g. banded iron formations). Types of depositional environments Continental * – type of Fluvial deposit. Caused by moving water in a fan shape (Alluvial Fan) and containing mostly impermeable and nonporous sediments well sorted. * . Often in deserts and coastal regions and well sorted, large scale cross-beds * – processes due to moving water, mainly streams. Common sediments are grav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcilutite
Calcilutite (also known as cementstone) is a type of limestone that is composed of predominantly, more than 50 percent, of either clay-size or both silt-size and clay-size detrital (transported) carbonate grains. These grains consist either of fossil fragments, ooids, intraclasts, pellets, other grains, or some combination of them. The term calcilutite was originally proposed in 1903 by GrabauGrabau, A.W. (1903) ''Paleozoic coral reefs.'' Geological Society of America Bulletin. vol. 14, pp. 337-352.Grabau, A.W. (1904) ''On the classification of sedimentary rocks.'' American Geologist. vol. 33, pp. 228-247. as a part of his calcilutite, calcarenite and calcirudite classification system based upon the size of the detrital grains composing a limestone.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, J.A., eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. Flügel, E. (2010) ''Microfacies of Carbonate Rocks'', 2nd ed. Springer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
