Talk:Moenkopi Formation

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Untitled[edit]

Redirects: Moenkopi, Moenkopi formation, Moenkopi Shale, Moenkopi shale, Moenkopi Group, Moenkopi group

Opening paragraph refers to the formation as red sandstone[edit]

According to Mckee in Stratigraphy and History of the Moenkopi of Triassic Age, pg. 26, "True sandstones are uncommon in the Moenkopi of southeastern Utah despite repeated references to them in the literature". They are scarce in the whole formation, according to Mckee, but this was the first quote I could find. It would be nice if someone with more knowledge could update this article with some information of stratigraphy and lithology. — Preceding unsigned comment added by 128.187.97.22 (talk • contribs) 01:58, 21 October 2013

The sandstones are in Arizona and New Mexico where the Moenkopi is more terrestrial and more fluvial (this is also where almost all of the tetrapod fossils are from). If you go west, into Nevada, it's more marine, and up north in Utah and Colorado it's practically all mudstones that have been interpreted as a freakishly large, freakishly stable tidal flat. See Reif and Slatt (1979) for their interpretation. It's a very heterogeneous formation. Troodon311 (talk) 23:07, 24 March 2015 (UTC)[reply]