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Menefee Shale
The Menefee Formation is a lower Campanian geologic Formation (geology), formation found in Colorado and New Mexico, United States. Description The Menefee Formation consists of fluvial sandstone, shale, and coal. Based on ammonite biostratigraphy, the age of the Menefee Formation can be constrained to 84.2-79 million years (Ma (unit), Ma), based on the presence of ''Baculites perplexus'' in the overlying Cliff House Sandstone, and ammonites from the late Santonian in the underlying Point Lookout Sandstone. Named members include a lower Cleary Coal Member and an upper Allison Member. The Mesaverde Group in the San Juan Basin records a marine regression-Transgression (geology), transgression sequence of the western margin of the Western Interior Seaway. The Menefee Formation was deposited at the peak of the regression as coastal river delta and swamp sediments, and includes numerous coal beds. The formation is exposed at Chaco Canyon National Park, where many of the coal beds ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesa Verde National Park
Mesa Verde National Park is an American national park and UNESCO World Heritage Site located in Montezuma County, Colorado. The park protects some of the best-preserved Ancestral Puebloan archaeological sites in the United States. Established by Congress and President Theodore Roosevelt in 1906, the park occupies near the Four Corners region of the American Southwest. With more than 5,000 sites, including 600 cliff dwellings, it is the largest archaeological preserve in the United States. Mesa Verde (Spanish for "green table", or more specifically "green table mountain") is best known for structures such as Cliff Palace, thought to be the largest cliff dwelling in North America. Starting BC Mesa Verde was seasonally inhabited by a group of nomadic Paleo-Indians known as the Foothills Mountain Complex. The variety of projectile points found in the region indicates they were influenced by surrounding areas, including the Great Basin, the San Juan Basin, and the Rio Grande ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
