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 River popular recreational activity on the Brazos River with many locations favorable for launching and recovery. The best paddling can be found immediately below Possum Kingdom Lake and Lake Granbury. Sandbar Camping is also permitted since the entire streambed of the river is considered to be state-owned public property. Fishing, camping, and picnicking are legal here, including on the sandbars. Several scout camps are located along the Brazos River and they support a wide range of water and shoreline activities for scouts, youth groups and family groups. The Brazos River Authority maintains several public campsites along the river and at the