The Conococheague Formation is a mapped Appalachian

Appalachia

Appalachia is a term used to describe a cultural region in the eastern United States that stretches from the Southern Tier of New York state to northern Alabama, Mississippi, and Georgia. While the Appalachian Mountains stretch from Belle Isle in Canada to Cheaha Mountain in the U.S...

 bedrock unit of Cambrian

Cambrian

The Cambrian is the first geological period of the Paleozoic Era, lasting from Mya ; it is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux. The period was established by Adam Sedgwick, who named it after Cambria, the Latin name for Wales, where Britain's...

 age, consisting primarily of limestone

Limestone

Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....

 and dolomite

Dolomite

Dolomite is a carbonate mineral composed of calcium magnesium carbonate CaMg2. The term is also used to describe the sedimentary carbonate rock dolostone....

. It occurs in central Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

, southern and central Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

, northern Virginia

Virginia

The Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...

 and easternmost West Virginia

West Virginia

West Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...

.

Depositional environment

The depositional environment

Sedimentary depositional environment

In geology, sedimentary depositional 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...

 of the Conococheague was most likely shallow marine to tidal on a carbonate platform.

Notable Exposures

The type section is located at Scotland

Scotland, Pennsylvania

Scotland is an unincorporated community in Franklin County, Pennsylvania, United States. It is located in Greene Township.-Scotland School for Veterans' Children:...

 in Franklin County, Pennsylvania

Franklin County, Pennsylvania

As of the census of 2000, there were 129,313 people, 50,633 households, and 36,405 families residing in the county. The population density was 168 people per square mile . There were 53,803 housing units at an average density of 70 per square mile...

 (northeast of Chambersburg

Chambersburg, Pennsylvania

Chambersburg is a borough in the South Central region of Pennsylvania, United States. It is miles north of Maryland and the Mason-Dixon line and southwest of Harrisburg in the Cumberland Valley, which is part of the Great Appalachian Valley. Chambersburg is the county seat of Franklin County...

).

Accessible outcrops occur along various roadcuts and waterways in the area, including roadcuts near mile marker 20 of I-70

Interstate 70 in Maryland

Interstate 70 is a part of the Interstate Highway System that runs from Cove Fort, Utah to Baltimore, Maryland. In Maryland, the Interstate Highway runs from the Pennsylvania state line in Hancock east to the Interstate's eastern terminus near its junction with I-695 at a park and ride in...

 near Hagerstown, Maryland. The bedding

Strike and dip

Strike and dip refer to the orientation or attitude of a geologic feature. The strike line of a bed, fault, or other planar feature is a line representing the intersection of that feature with a horizontal plane. On a geologic map, this is represented with a short straight line segment oriented...

 at this site is nearly vertical, with the strike nearly perpendicular to the highway, and thus one can easily walk up and down the sections.

The Conococheague also forms dramatic, 100-foot

Foot

The foot is an anatomical structure found in many vertebrates. It is the terminal portion of a limb which bears weight and allows locomotion. In many animals with feet, the foot is a separate organ at the terminal part of the leg made up of one or more segments or bones, generally including claws...

 cliffs along the Potomac River

Potomac River

The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...

 upstream of Shepherdstown, West Virginia

Shepherdstown, West Virginia

Shepherdstown is a town in Jefferson County, West Virginia, United States, located along the Potomac River. It is the oldest town in the state, having been chartered in 1762 by Colonial Virginia's General Assembly. Since 1863, Shepherdstown has been in West Virginia, and is the oldest town in...

 (northwest of Harpers Ferry

Harpers Ferry, West Virginia

Harpers Ferry is a historic town in Jefferson County, West Virginia, United States. In many books the town is called "Harper's Ferry" with an apostrophe....

), where entrenched meander

Meander

A meander in general is a bend in a sinuous watercourse. A meander is formed when the moving water in a stream erodes the outer banks and widens its valley. A stream of any volume may assume a meandering course, alternately eroding sediments from the outside of a bend and depositing them on the...

s expose mile-long sections of tilted Conococheague strata. These may be easily seen from the towpath trail of the Chesapeake and Ohio Canal National Historical Park

Chesapeake and Ohio Canal National Historical Park

The Chesapeake and Ohio Canal National Historical Park is a United States National Historical Park located in the District of Columbia and the states of Maryland and West Virginia. The park was established as a National Monument in 1961 by President Dwight D...

 along the Maryland bank of the Potomac. In Shepherdstown itself, the top of a Conococheague cliff provides the setting for the monument to steamboat

Steamboat

A steamboat or steamship, sometimes called a steamer, is a ship in which the primary method of propulsion is steam power, typically driving propellers or paddlewheels...

-inventor James Rumsey

James Rumsey

James Rumsey was an American mechanical engineer chiefly known for exhibiting a boat propelled by machinery in 1787 on the Potomac River at Shepherdstown, now West Virginia, before a crowd of local notables, including Horatio Gates...

.

Fossils

Conodont

Conodont

Conodonts are extinct chordates resembling eels, classified in the class Conodonta. For many years, they were known only from tooth-like microfossils now called conodont elements, found in isolation. Knowledge about soft tissues remains relatively sparse to this day...

s are present in the Conococheague.

Thrombolite

Thrombolite

Thrombolites are clotted accretionary structures formed in shallow water by the trapping, binding, and cementation of sedimentary grains by biofilms of microorganisms, especially cyanobacteria . Stromatolites are similar but consist of layered accretions.-External links:*...

s and the possible chiton

Chiton

Chitons are small to large, primitive marine molluscs in the class Polyplacophora.There are 900 to 1,000 extant species of chitons in the class, which was formerly known as Amphineura....

 Matthevia

Matthevia

Matthevia is a Cambrian mollusc, perhaps related to the chitons. It consists of repeated monoplacophoran-like shells; according to one hypothesis, chitons arose when these tall shells began to overlap over the generations. The tall element of the shell was retained and forms the tips of modern...

are present in the Boxley Blue Ridge Quarry in Bedford County

Bedford County, Virginia

As of the census of 2000, there were 60,371 people, 23,838 households, and 18,164 families residing in the county. The population density was 80 people per square mile . There were 26,841 housing units at an average density of 36 per square mile...

, Virginia.