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The Fountain Formation is a Pennsylvanian bedrock unit consisting primarily of conglomerate, sandstone, or arkose, in the states of Colorado and Wyoming in the United States, along the east side of the Front Range of the Rocky Mountains, and along the west edge of the Denver Basin.
Other Colorado examples of Fountain Formation geology include nearby Roxborough State Park, Garden of the Gods near Colorado Springs, and the Flatirons near Boulder. The rocks were formed about 290-296 million years ago when the Ancestral Rocky Mountains were eroded during the Pennsylvanian epoch .
Wind, gravity, rainwater, snow, and ice-melt supplied rivers that ultimately carved through the granite mountains and eventually led to their complete removal. The sediment from these mountains lies in the very red Fountain Formation today. Red Rocks Amphitheatre outside of Denver, Colorado, is set within the Fountain Formation. [2]
Roxborough State Park is a designated Colorado Natural Area and National Natural Landmark for its 300-million-year-old red sandstone Fountain Formations that tilt at a 60-degree angle. The park includes great examples of exposed Precambrian to Late Mesozoic hogback, monolithic and spire formations from the Permian , Pennsylvanian and Cretaceous ...
The Flatirons are rock formations in the western United States, near Boulder, Colorado, consisting of flatirons.There are five large, numbered Flatirons ranging from north to south (First through Fifth, respectively) along the east slope of Green Mountain (elev. 8,148 ft or 2,484 m), and the term "The Flatirons" sometimes refers to these five alone.
The White River Formation is found in the Northeastern corner of the Colorado, and was deposited between ~37.2 and ~30.8 Ma, encompassing parts of the late Eocene and early Oligocene. The formation is composed primarily of claystones , mudstones , and siltstones , within which a variety of fossil organisms, collectively referred to as the White ...
Colorado National Natural Landmarks (clickable map) There are 17 National Natural Landmarks in U.S. state of Colorado , one of which extends into Wyoming . They cover areas of geological, biological and historical importance, and include lakes, mountains, rock formations and numerous fossil sites.
The USGS convention has been to use Colorado Group where the rocks are further divided into formations, Colorado Formation where no beds are developed enough to be mapped as formations, and Colorado Shale where the unit is composed of little more than shale with no distinctive structures (such as in north-central Montana).