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Fossil wood from Chinle Formation exposures at Petrified Forest National Park . Some of the most extensive deposits of the Chinle Formation are found in the southern Colorado Plateau, including Arizona and the western portion of New Mexico. In this region, the oldest and stratigraphically lowest portion of the Chinle is the Shinarump Conglomerate.
In the Chama Basin of New Mexico, the Chinle Formation is promoted to group status and the Petrified Forest Formation has the following members: [3] Painted Desert Member; Mesa Montoso Member; The Mesa Montosa Member is up to 22 meters (72 feet) thick and is mostly composed of sandstone (44%) and mudstone (35%), with a lesser proportion of ...
Amphibians of the Chinle Formation; Genus Species State Member Abundance Notes Images Apachesaurus [74] A. gregorii [74] Arizona [74] Owl Rock [74] Petrified Forest [74] Blue Mesa [74] Common in the Owl Rock and Petrified forest members. [74] Blue Mesa remains are fragmentary. [74] A metoposaurid temnospondyl which is a junior synonym of Anaschisma
The Petrified Forest is known for its fossils, especially fallen trees that lived in the Late Triassic Epoch, about 225 million years ago. The sediments containing the fossil logs are part of the widespread and colorful Chinle Formation, from which the Painted Desert gets its name.
Where the Shinarump lies on Moenkopi Formation, the upper Moenkopi beds tend to be bleached. [2] The upper contact of the Shinarump with younger Chinle beds tends to be gradational. [2] The partial geologic sequence is as follows, up to the latest Petrified Forest Member: [8] Petrified Forest Member, Late Triassic, 215 Ma Shinarump Conglomerate ...
The Blue Mesa Member is a member of the Chinle Formation. It is located in the Petrified Forest National Park of northeast Arizona. [1] Geology
Uranium salts accumulated in this formation in economically extractable quantities and petrified wood was formed (petrification was probably aided by the presence of volcanic ash). [7] Chinle members represented in the Capitol Reef area are (from oldest to youngest): [10] Shinarump Member, Monitor Butte Member, Petrified Forest Member, and; Owl ...
Owl Rock stands atop Tyende Mesa which is formed of the Triassic Chinle Formation. The Owl Rock Member of the Chinle Formation, composed of cherty limestone and limestone conglomerate beds alternating with claystone, mudstone, and siltstone beds, forms the upper half of the mesa, and it overlays the Petrified Forest Member of the lower half. [7]
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