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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.
In 1942, Pottstown annexed a little more than five acres bounded by North Hills Boulevard, Mulberry Street and Keim Street. In November 1953, the voters of Lower Pottsgrove Township supported the Township becoming a first-class Township for the primary purpose of preventing further annexation by the Borough of Pottstown.
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.
The name of the creek comes from the Lenape (or Delaware Indian) term Man'en'tau'wata'wik.Some early sources state that the term translates to "where we drank liquor", [3] but later sources disagree with that interpretation, putting the meaning closer to "here we drink" or "drink-at-uninhabited-place," without reference to liquor.
When heating hard water on the stove, these gas bubbles form on the surface of the pan prior to boiling. Gas exsolution can also occur when the confining pressure is released such as when you take the top off a beer bottle or where subsurface water is flowed into an atmospheric pressure tank.
The products of chalk weathering are dissolved in rainwater and are transported in stream flow. Chalk streams transport little suspended material (unlike most rivers), but are considered "mineral-rich" due to the dissolved calcium and carbonate ions. The surface water of chalk streams is commonly described as "gin clear".
The originators of the project did not count upon the coal trade to promote the success of the undertaking. They looked forward mainly to transporting the agricultural products being produced below the mountains, the lumber of Schuylkill County, and the grain and other products of the counties between the Susquehanna and Schuylkill rivers.
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