Also known as LACM Loc. #5572; Fruita, Quarry 4, CO-33
Where: Mesa County, Colorado (39.1° N, 108.8° W: paleocoordinates 35.5° N, 55.9° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Brushy Basin Member (Morrison Formation), Tithonian (152.1 - 145.0 Ma)
• "Drab flood-plain facies" at the base of the Brushy Basin Member of the Morrison Formation immediately above the "clay change" horizon (see Kirkland 2006, New Mexico Museum of Natural History and Science Bulletin, 36:67-95, fig. 6, pg. 93). Turner & Peterson (1999, Vertebrate Paleontology in Utah, Utah Geol. Survey Misc. Publ. 99-1, 77-114) placed the Fruitadens localities (listed as CO-33 in their stratigraphic sections) within the Kimmeridgian, and within their "Dinosaur Zone 2" and "charophyte-ostracod Zone 4". Stratigraphic horizons closely equivalent to the Fruitadens quarries yield 40Ar/39Ar isotopic dates of 150.3 +/- 0.3 Ma and 150.2 +/- 0.5 Ma (see Turner & Peterson 1999). This would place the Fruita quarries within the early Tithonian on recent timescales.
•"middle of the formation near the base of the Brushy Basin Member"
• bed-level stratigraphic resolution
Environment/lithology: crevasse splay; gray mudstone and sandstone
Size classes: macrofossils, mesofossils
Collected by G. L. Callison & party in July/August 1979; reposited in the LACM
Collection methods: surface (float), mechanical,
Primary reference: G. Callison and H. M. Quimby. 1984. Tiny dinosaurs: are they fully grown?. Journal of Vertebrate Paleontology 3(4):200-209 [M. Carrano/M. Carrano]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 53040: authorized by Matthew Carrano, entered by Kaitlin Maguire on 01.09.2005, edited by Matthew Carrano
Creative Commons license: CC BY (attribution)
Taxonomic list
Malacostraca | |
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Mammalia | |
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Priacodon fruitaensis n. sp.6
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Reptilia | |
"Chelonia indet." = Testudines5
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"Parviraptor gilmorei" = Diablophis gilmorei6
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Macelognathus vagans3 Marsh 1884 crocodilian LACM 5572/150148 (cranial and postcranial elements), 5572/150211 (metatarsal III and both calcanea)
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"Prismatoolithus coloradensis" = Preprismatoolithus coloradensis4
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Actinopteri | |
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