North Park (Colorado basin)

. The valley floor is underlain by Mesozoic sedimentary rocks that form a structural basin. The stratigraphy is similar to that in adjacent basins such as the Green River Basin to the west and the Denver Basin to the east. Information provided on Fish and Wildlife Service plaques at an overlook southeast of Walden indicates that the area was formerly a shallow sea, and that fossilized shark teeth can be found in the area. Petroleum has long been produced from anticlinal traps of the Muddy Sandstone (Cretaceous) at North McCallum and South McCallum oil fields. In 2007, North Park produced 96 thousand barrels of oil and 1.3 billion cubic feet (BCF) of natural gas from 153 wells. In 2008 EOG Resources announced great success in drilling and completing horizontal oil wells in the Cretaceous Niobrara Formation. ==Industrial city==

In 1914 Rev Hiram Vrooman proposed the establishment of a utopian community in North Park. It was a co-operative project in which it was envisioned that all the various industries and businesses would be united in a single management, with the "coworker citizens" receiving equitable recompense for their work. They owned the rights on 7,000 acres, 3,000 acres in Sedgwick County and a further 800 acres at Ute Pass. They also owned a pickling factory in Denver. ==In popular culture==

The fictional town of North Park, CO from the animated series South Park is based on the basin. The town is first mentioned in the Season Two episode Summer Sucks, and is additionally mentioned in Cartmanland, Sarcastaball, and Cartman Joins NAMBLA. Trey Parker, one of the creators of the South Park series, grew up in Conifer, about 40 miles (65 km) east of Fairplay. ==See also==