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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.
At the 2000 census, there were 4,818 people, 1,964 households, and 1,325 families living in the township.The population density was 662.2 people per square mile (255.7 people/km 2).
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 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".
Coaldale is a borough in Schuylkill County, Pennsylvania, United States.Initially settled in 1827, it was incorporated in 1906 from part of the former Rahn Township; it is named for the coal industry—wherein, it was one of the principal early mining centers.
St. Clair is a borough in Schuylkill County, Pennsylvania, United States. [4] It is located 2 mi (3.2 km) north of Pottsville in the southern Coal Region.Extensive deposits of hard coal are present.
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This district encompasses 956 contributing buildings and one contributing site that are located in the central business district and surrounding residential areas of Pottstown. It features a variety of residential buildings, such as workers' home and residences of prominent and wealthy citizens that were designed in a variety of architectural ...
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