Thursday, April 19, 2012 2:13:31 PM
Maximum thickness of the Marcellus ranges from 270 m (890 ft) in New Jersey,[1] to 12 m (40 ft) in Canada.[25] In West Virginia, the Marcellus Formation is as much as 60 m (200 ft) thick.[67] In extreme eastern Pennsylvania, it is 240 m (790 ft) thick,[39] thinning to the west, becoming only 15 m (49 ft) thick along the Ohio River, and only a few feet in Licking County, Ohio.[4] The thinning, or stratigraphic convergence, from east to west is caused by decreasing grain size in the clastic deposits, which entered the basin from the east.[82] The beds finally "pinch out" westward because deposition was limited by the Cincinnati Arch,[44][91] the bulge that formed the west shore of the basin. Where the formation is relatively thick, it is divided into several members, and as the formation continues to thicken to the east, these members are further divided. Some workers chose to classify the Marcellus as a subgroup, and classify some of the members as separate formations.
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