How old is entrada sandstone

Mesozoic chronostratigraphy of Colorado. Burro Canyon Formation Horsetooth Formation. Chinle Formation. Chugwater Formation. Jelm Formation Moenkopi Formation. Moenkopi Formation. Paleozoic chronostratigraphy of Colorado. Fountain Formation Madera Formation. Louis Formation Ste. Genevieve Formation Warsaw Formation. Fremont Limestone Viola Formation. Harding Sandstone Simpson Formation.

Dotsero Formation. Lodore Formation Sawatch Formation. Precambrian chronostratigraphy of Colorado. Uinta Mountain Group. Uncompahgre Formation. Credit: see original file. Entrada Sandstone. Suggest as cover photo Would you like to suggest this photo as the cover photo for this article? Yes, this would make a good choice No, never mind.

The Entrada Sandstone is classified as a formation, which is the fundamental unit in the geologic system of naming. To learn more about how formations are named, please refer to the February Geology Happenings column in the Moab Happenings online archive. Formations are sometimes divided into subunits called members, like some books are divided into chapters.

Slickrock is a term. For example, large areas of slickrock in southeastern Utah are also formed by the Cedar Mesa and the Navajo Sandstones. As a formal geologic name, the Slick Rock Member is only in the Entrada. It is also a sandstone but is off-white or tan in color and not as thick as the Slick Rock unit, but otherwise looks similar as it was also deposited by wind in an ancient erg. As this process continues, arches will develop as the windows grow Doelling, Carmel Formation: The Carmel Formation is a mix of siltstone, mudstone, and sandstone that was deposited in the Middle to Late Jurassic.

The formation was deposited during several transgressive-regressive sequences in a marginal marine setting Richards, This formation is present in the youngest parts of the park and is not widely seen. It is cross-stratified throughout, with large scale slip faces easily discernable from a distance. This deposit is the result of an ancient erg, or sand sea. The sandstone is a light yellow-orange in color and is supermature.

It is also cross-stratified and supermature. Like the Entrada, the Navajo sandstone is the result of an ancient erg.

However, unlike the Entrada, the Navajo has a distinct pink-to-red coloring, the result of iron oxides in a reducing environment that occurred post-deposition. The Navajo Sandstone makes up the base of the park and is largely not seen Navajo, These massive features formed as the Paradox Formation ascended through less dense bedrock. It began to fracture the Navajo and Entrada Sandstones, which resulted in jointing at the points of least resistance.

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