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Chalk is so common in Cretaceous marine beds that the Cretaceous Period was named for these deposits. The name Cretaceous was derived from Latin creta, meaning chalk. [10] Some deposits of chalk were formed after the Cretaceous. [11] The Chalk Group is a European stratigraphic unit deposited during the late Cretaceous Period.
On the geologic map, "Trenton Gravel" is used to describe most of these sediments. Much of the alluvial sediments that exist here are sand, silt, and clays. [6] The traditional boundary of the coastal plain is the Fall Line. The coastal plain in Pennsylvania was once home to thousands of acres of fresh water tidal marsh.
The Chalk Group is now divided into a White Chalk Subgroup and a Grey Chalk Subgroup, both of which are further subdivided into formations.These modern divisions replace numerous earlier divisions, references to which occur widely on geological maps and in other geological literature.
Chalk Downs, pale green (6) Geological section from north to south The geology of East Sussex is defined by the Weald–Artois anticline , a 60 kilometres (37 mi) wide and 100 kilometres (62 mi) long fold within which caused the arching up of the chalk into a broad dome within the middle Miocene , [ 1 ] which has subsequently been eroded to ...
Manatawny Creek joins the river near Pottstown in the map. Manatawny Creek is an 18.2-mile-long (29.3 km) [ 1 ] tributary of the Schuylkill River in Pennsylvania in the United States . [ 2 ]
EL PASO, Texas – If the federal government shuts down Friday, U.S. border crossings will stay open and border agents will keep working through the holidays – without pay, at least temporarily. ...
Pottstown is a borough in Montgomery County, Pennsylvania, United States. Pottstown was laid out in 1752–53 and named Pottsgrove in honor of its founder, John Potts. The old name was abandoned at the time of the incorporation as a borough in 1815. In 1888, the limits of the borough were considerably extended.
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