Organ Rock Formation Organ Rock Formation The Organ Rock Formation or Organ Rock Shale is a formation within the late Pennsylvanian to early Permian Cutler Group and is deposited across southeastern Utah, northwestern New Mexico, and northeastern Arizona. This formation notably outcrops around Canyonlands National Park, Natural Bridges National Monument, and Monument Valley. The age of the Organ Rock is constrained to the latter half of the Cisuralian Epoch by age dates from overlying and underlying formations. Important early terrestrial vertebrate fossils have been recovered from this formation in northern Arizona, southern Utah, and northern New Mexico. These include the iconic Permian terrestrial
Brazos Valley Brazos Valley The Brazos Valley ( ) is a region in the U.S. state of Texas (a subsection of the larger Central Texas region) consisting of the counties of Brazos, Burleson, and Robertson (which collectively comprise the Bryan–College Station metropolitan area), and the neighboring counties of Grimes, Leon, Madison, and Washington. The area is centered on Brazos County, the cities of College Station and Bryan, and Texas A&M University. Although the Brazos River lies at the center of the region, not all areas of the region are a part of the Brazos watershed. The population of the region was estimated