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 Bend State Park yearly offerings include the A Simple Christmas celebration, Prairie Heritage Days, and the July 4th Bike Parade. The Park also hosts a variety of activities put on in conjunction with other entities, including the Christmas Bird Count and the Butterfly count, undertaken as part of the Audubon Society and North American Butterfly Association's national efforts, respectively. Brazos Bend State Park's Christmas Bird Count effort is routinely in the top 3-4% of the over 2000 Counts taking place in North America. The park is also home to the George Observatory (code: ), a satellite facility of the Houston Museum of Natural