Also known as Cedar Mountain Formation
Where: Emery County, Utah (39.1° N, 111.0° W: paleocoordinates 40.3° N, 73.0° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Mussentuchit Member (Cedar Mountain Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)
• Kirkland et al. 2016 stated that Tempskya are only known from the Mussentuchit Member within the Cedar Mountain Formation. This is recently believed to be Cenomanian in age according to Tucker et al. 2020.
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•A radiometric age of 98.37 ± 0.07 Ma was obtained by the OMNH from volcanic ash within the Mussentuchit Member (Cifelli and others, 1997, 1999). Additional ages by Garrison and others (2007) ranging from 96.7 ± 0.5 to 98.2 ±0.6 Ma indicate that the Mussentuchit Member was deposited over an interval of 1.5 Ma during the early Cenomanian and supports a correlation with the siliceous marine Mowry Shale to the north, which is well-constrained from 40Ar/39Ar sanidine ages obtained from bentonite beds that bracket the Mowry in Wyoming; the basal Arrow Creek Bentonite is 98.5 ± 0.5 Ma and the capping Clay Spur Bentonite is 97.2 ± 0.7 Ma (Obradovich, 1993; Ogg and Hinnov, 2012; Sprinkel and others, 2012) near the base of the Upper Cretaceous. Tucker et al. 2020 also suggested a likely depositional age of ~96-94Ma for the Musseuntuchit member.
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• formation-level stratigraphic resolution
Environment/lithology: fluvial-lacustrine; sandstone and gray, green shale
Size class: mesofossils
Preservation: original carbon
Collection methods: bulk,
Primary reference: W. D. Tidwell and G. F. Thayn. 1985. Flora of the Lower Cretaceous Cedar Mountain Formation of Utah and Colorado, Part IV. Palaeopiceoxylon thinosus (Protopinaceae). The Southwestern Naturalist 30(4):525-532 [B. Tiffney/J. Fosdick/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 31193: authorized by Bruce Tiffney, entered by Julia Fosdick on 22.04.2003, edited by Matthew Carrano
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Magnoliopsida | |
Icacinoxylon pittiense n. sp. Thayne et al. 1985
Icacinoxylon pittiense Thayne et al. 1985 | |
Pinopsida | |
Cedroxylon sp. Kraus 1870 | |
Pityoxylon sp. Kraus 1870 yew | |
Mesembrioxylon stokesi podocarp | |
Palaeopiceoxylon thinosus Tidwell and Thayn 1985 | |
Monanthesia sp. Wieland 1934 | |
Angiospermae | |
Plataninium sp. Unger 1842 | |
Polypodiopsida | |
Tempskya knowltoni, Tempskya whiteheadi n. sp., Tempskya jonesii n. sp., Tempskya minor, Tempskya superba
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Equisetopsida | |
Frenelopsis varians Fontaine 1893
Brachyphyllum crassicaule Fontaine | |
Gnathostomata | |
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Reptilia | |
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Cerapoda indet. Sereno 1986 ornithischian "ornithiscian teeth of either ceratopsian or hadrosaurian origin"
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