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Witte Hi Pt S P Geology

The martinsburg formation is middle and late

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Unformatted text preview: ilt and clay that were eroded from higher areas along an ancient continental margin and carried downslope by density currents to deeper parts of the ocean. Sediments deposited in this manner are called turbidites. Each turbidite may contain five different layers and each layer is defined by sediment grain size and sedimentary structures (fig. 3). The layers range from several inches to more than ten feet thick. In New Jersey, turbidite sequences generally contain only the upper three finer grained layers (fig. 3, layers C, D, and E) because the lower two were Grain eroded or deposited farther up Size the continental slope. The Martinsburg is divided E Mud into the Bushkill, Ramseyburg, and the High Point Members. The Bushkill Member is the D oldest, consisting of about C Sand1,500 feet of black shale that silt was formed from clay deposited B in the deepest parts of the ocean basin. Overlying the Bushkill Member and younger than it A Sand are the interlayered shales, siltstones and minor sandstones of the Ramseyburg Member. This layering and overall increase in grain size shows that these sediments were laid down in a Figure 3. This diagram portrays the five parts of a classic turbidite. Not all slightly shallower ocean closer to parts are present every time. The most their source. The Ramseyburg common turbidite in this part of New ranges from 2,400 to 5,000 feet Jersey lacks part A and sometimes B. in thickness in New Jersey and The remaining parts, C, D, and E have a is about 3,500 feet thick near the combined thickness of several inches. park. The High Point Member is 4 as much as 4,500 feet thick, and is the youngest and only member in the park. It consists of alternating thin sandstone, siltstone, and shale. The sandstone layers are typically coarse at their base and finer-grained near their top, a feature called graded bedding. These layers are as much as 6 feet thick and make up the coarsest part of the turbidite sequence (fig. 3). Pebbles of shale in their base show that the currents that carried them were powerful enough t...
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