Ferns from the Chinle Formation (Upper Triassic) in the Fort Wingate area, New Mexico

1969 ◽  
Author(s):  
S.R. Ash
Keyword(s):  
New Mexico ◽  
Upper Triassic ◽  
Chinle Formation

Dolabrosaurus aquatilis, a small lepidosauromorph reptile from the Upper Triassic Chinle Formation of north-central New Mexico

1992 ◽  
Vol 66 (6) ◽  
pp. 1001-1009 ◽  
Author(s):  
David S Berman ◽  
Robert R. Reisz
Keyword(s):  
New Mexico ◽  
Vertebral Column ◽  
Upper Triassic ◽  
Single Specimen ◽  
Italian Alps ◽  
North Central ◽  
New Family ◽  
Chinle Formation

Dolabrosaurus aquatilis n. gen. and sp., a small amphibious or aquatic reptile from the Upper Triassic Chinle Formation of north-central New Mexico, is described on the basis of portions of the vertebral column and partial fore- and hindlimbs of a single specimen. Comparison with other Triassic reptiles indicates that D. aquatilis is most closely related to Drepanosaurus unguicaudatus, a small, enigmatic lepidosauromorph from the Upper Triassic Zorzino Formation of the Italian Alps. Both species are assigned to a new family, Drepanosauridae, with Dolabrosaurus recognized as more primitive in some aspects of its vertebral and pedal morphology. The precise assignment of Drepanosauridae within the Lepidosauromorpha remains uncertain.

scholarly journals A new rauisuchid (Archosauria, Pseudosuchia) from the Upper Triassic (Norian) of New Mexico increases the diversity and temporal range of the clade

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2336 ◽  
Author(s):  
Emily J. Lessner ◽  
Michelle R. Stocker ◽  
Nathan D. Smith ◽  
Alan H. Turner ◽  
Randall B. Irmis ◽  
...  
Keyword(s):  
United States ◽  
New Mexico ◽  
Upper Triassic ◽  
Late Triassic ◽  
Morphological Evidence ◽  
Ventral Margin ◽  
Close Phylogenetic Relationship ◽  
Chinle Formation ◽  
Geographic Separation ◽  
A New Species

Rauisuchids are large (2–6 m in length), carnivorous, and quadrupedal pseudosuchian archosaurs closely related to crocodylomorphs. Though geographically widespread, fossils of this clade are relatively rare in Late Triassic assemblages. The middle Norian (∼212 Ma) Hayden Quarry of northern New Mexico, USA, in the Petrified Forest Member of the Chinle Formation, has yielded isolated postcranial elements and associated skull elements of a new species of rauisuchid.Vivaron haydenigen. et. sp. nov. is diagnosed by the presence of two posteriorly directed prongs at the posterior end of the maxilla for articulation with the jugal. The holotype maxilla and referred elements are similar to those of the rauisuchidPostosuchus kirkpatrickifrom the southwestern United States, butV. haydenishares several maxillary apomorphies (e.g., a distinct dropoff to the antorbital fossa that is not a ridge, a straight ventral margin, and a well defined dental groove) with the rauisuchidTeratosaurus suevicusfrom the Norian of Germany. Despite their geographic separation, this morphological evidence implies a close phylogenetic relationship betweenV. haydeniandT. suevicus. The morphology preserved in the new Hayden Quarry rauisuchidV. haydenisupports previously proposed and new synapomorphies for nodes within Rauisuchidae. The discovery ofVivaron haydenireveals an increased range of morphological disparity for rauisuchids from the low-paleolatitude Chinle Formation and a clear biogeographic connection with high paleolatitude Pangea.

Geology and taphonomy of the Coelophysis quarry, Upper Triassic Chinle Formation, Ghost Ranch, New Mexico

1994 ◽  
Vol 68 (5) ◽  
pp. 1118-1130 ◽  
Author(s):  
Hilde L. Schwartz ◽  
David D. Gillette
Keyword(s):  
New Mexico ◽  
Single Species ◽  
Upper Triassic ◽  
Environmental Crisis ◽  
Theropod Dinosaur ◽  
Small Channel ◽  
Abandoned Channel ◽  
Chinle Formation ◽  
Channel Deposits ◽  
Petrographic Study

The Coelophysis dinosaur quarry at Ghost Ranch, near Abiquiu, New Mexico, is unique among Triassic fossil sites for its yield of numerous complete and partial skeletons of a single species of theropod dinosaur (Coelophysis bauri). Since its discovery in 1947 by E. H. Colbert in the red siltstone beds of the Upper Triassic Chinle Formation, the quarry has yielded the remains of at least 1,000 individuals from approximately 30 cubic meters of excavated material. The main bone-bearing strata are abandoned channel deposits that are part of a siltstone overbank sequence. The Coelophysis remains found at the quarry are remarkably whole and well preserved, though they range in degree of articulation from complete skeletons to isolated limbs and bones. Skeletons, partial skeletons, and bones are crudely aligned and show little evidence of predator or scavenger disturbance or surface weathering. Geologic and taphonomic evidence suggests that the dinosaurs preserved in the Ghost Ranch quarry were transported to the site as carcasses by fluvial currents. The carcasses blocked a small channel and were subsequently buried by silts. Petrographic study and neutron activation analysis reveal no evidence of volcanic ash, paleopathologic osteology, or unusual chemistry in the quarry bone and sediments. The virtual monospecificity, taphonomy, and ecology of the assemblage suggest that the dinosaurs perished due to a regional environmental crisis, such as drought.

High-resolution U–Pb ages from the Upper Triassic Chinle Formation (New Mexico, USA) support a diachronous rise of dinosaurs

2011 ◽  
Vol 309 (3-4) ◽  
pp. 258-267 ◽  
Author(s):  
Randall B. Irmis ◽  
Roland Mundil ◽  
Jeffrey W. Martz ◽  
William G. Parker
Keyword(s):  
New Mexico ◽  
High Resolution ◽  
Upper Triassic ◽  
Chinle Formation
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