Results 31 to 40 of about 348 (119)

New Geochronological Age Constraint and Chemostratigraphy for Aptian Lacustrine Strata, Cedar Mountain Formation, Utah

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 9, September 2023., 2023
Abstract The Early Cretaceous is an important time of transition in Earth history, marked by a succession of oceanic anoxic events and carbon cycle perturbations that drove changes on land and in the ocean. The need for more precise geochronologic constraints in terrestrial sediments of Early Cretaceous age that record faunal and floral transitions is ...
Marina B. Suarez, Aisha Al Suwaidi, Elizabeth H. Montgomery, James I. Kirkland, Joe Andrew, Noah Mclean, Andreas Möller, Gregory Ludvigson, Celina A. Suarez   +8 more
wiley   +1 more source

A brief review of non-avian dinosaur biogeography: state-of-the-art and prospectus. [PDF]

Biol Lett
Dinosaurs potentially originated in the mid-palaeolatitudes of Gondwana 245–235 million years ago (Ma) and may have been restricted to cooler, humid areas by low-latitude arid zones until climatic amelioration made northern dispersals feasible ca 215 Ma.
Upchurch P, Chiarenza AA.
europepmc   +3 more sources

A baenid turtle shell from the Mesaverde Formation (Campanian, Late Cretaceous) of Park County, Wyoming, USA

Peer Community Journal, 2023
The Mesaverde Formation of the Wind River and Bighorn basins of Wyoming preserves a rich yet relatively unstudied terrestrial and marine faunal assemblage dating to the Campanian.
Wu, Ka Yan, Heuck, Jared, Varriale, Frank J., Farke, Andrew   +3 more
doaj   +1 more source

A Problematic Tyrannosaurid (Dinosauria: Theropoda) Skeleton and Its Implications for Tyrannosaurid Diversity in the Horseshoe Canyon Formation (Upper Cretaceous) of Alberta

The Anatomical Record, Volume 303, Issue 4, Page 673-690, April 2020., 2020
ABSTRACT Several published censuses have noted the presence of two tyrannosaurids, Daspletosaurus sp. and Albertosaurus sarcophagus, within the Upper Cretaceous Horseshoe Canyon Formation of Alberta. Although A. sarcophagus is known from more than a dozen major discoveries in these strata, Daspletosaurus sp.
Jordan C. Mallon, Jonathan R. Bura, Dirk Schumann, Philip J. Currie   +3 more
wiley   +1 more source

A Review of the fossil record of turtles of the clade Baenidae [PDF]

, 2016
The fossil record of the turtle clade Baenidae ranges from the Early Cretaceous (Aptian—Albian) to the Eocene. The group is present throughout North America during the Early Cretaceous, but is restricted to the western portions of the continents in the ...
Archibald J.D., Baur G., Blob R.W., Breithaupt B.H., Brinkman D., Brinkman D.B., Brinkman D.B., Case E.C., Cope E.D., Cope E.D., Cope E.D., Cope E.D., Cope E.D., Cope E.D., Dollo M.L., Estes R., Fiorillo A.R., Gaffney E.S., Gaffney E.S., Gaffney E.S., Gaffney E.S., Gaffney E.S., Gaffney E.S., Gaffney E.S., Gaffney E.S., Gilmore C.W., Gilmore C.W., Gilmore C.W., Gray J.E., Hay O.P., Hay O.P., Hay O.P., Hirayama R., Holroyd P.A., Holroyd P.A., Hutchison J.H., Hutchison J.H., Joyce W.G., Joyce W.G., Joyce W.G., Joyce W.G., Joyce W.G., Joyce W.G., Karl H.V., Kranz P.M., Lambe L.M., Lambe L.M., Lambe L.M., Lambe L.M., Leidy J., Leidy J., Leidy J., Leidy J., Leidy J., Leidy J., Lichtig A.J., Lillegraven J.A., Lipka T.R., Lucas S.G., Lucas S.G., Lyson T.R, Lyson T.R., Lyson T.R., Lyson T.R., Lyson T.R., Owen R., Parks W.A., Rabi M., Riabinin A.N., Rice D.D., Russell L., Stanton T.W., Storer J.E., Sullivan R.M., Tyler R. Lyson, Walter G. Joyce, Weems R.E., Weems R.E., Williams E.E., Wiman C.   +79 more
core   +1 more source

Cranial anatomy and stratigraphy of a new specimen of the tyrannosaurine dinosaur Daspletosaurus from the Judith River Formation of Central Montana, USA [PDF]

Acta Palaeontologica Polonica
The tyrannosaurine Daspletosaurus contains three recognized species from the Campanian of Montana and Alberta: Daspletosaurus torosus, Daspletosaurus wilsoni, and Daspletosaurus horneri. The recently named D. wilsoni has been proposed to represent a
ETHAN WARNER-COWGILL, GLENN W. STORRS, RAYMOND R. ROGERS, ANTHONY E. MALTESE   +3 more
doaj   +1 more source

Evolution and Diversity of Ornithomimid Dinosaurs in the Upper Cretaceous Belly River Group of Alberta [PDF]

, 2015
Ornithomimids from the Upper Cretaceous Belly River Group are among the best known theropods from these deposits, but questions remain concerning the oldest definitive occurrence of these dinosaurs in Alberta, as well as the taxonomic diversity of the ...
McFeeters, Bradley
core   +2 more sources

Skull ecomorphology of megaherbivorous dinosaurs from the dinosaur park formation (upper campanian) of Alberta, Canada. [PDF]

PLoS ONE, 2013
Megaherbivorous dinosaur coexistence on the Late Cretaceous island continent of Laramidia has long puzzled researchers, owing to the mystery of how so many large herbivores (6-8 sympatric species, in many instances) could coexist on such a small (4-7 ...
Jordan C Mallon, Jason S Anderson
doaj   +1 more source

New insights into chasmosaurine (Dinosauria: Ceratopsidae) skulls from the Upper Cretaceous (Campanian) of Alberta, and an update on the distribution of accessory frill fenestrae in Chasmosaurinae [PDF]

PeerJ, 2018
Chasmosaurine ceratopsids are well documented from the Upper Cretaceous (Campanian) Dinosaur Park Formation (DPF) of southern Alberta and Saskatchewan, and include Chasmosaurus belli, Chasmosaurus russelli, Mercuriceratops gemini, Vagaceratops irvinensis,
James A. Campbell, Michael J. Ryan, Claudia J. Schröder-Adams, David C. Evans, Robert B. Holmes   +4 more
doaj   +2 more sources

A new late-surviving early diverging Ibero-Armorican duck-billed dinosaur and the role of the Late Cretaceous European Archipelago in hadrosauroid biogeography [PDF]

, 2021
The anatomy and phylogenetic systematics of a well preserved hadrosauroid dentary collected in the 1990s from uppermost Maastrichtian strata (within chron C29r) of the Figuerola Formation, in the Àger syncline of the southern Pyrenees in northeastern ...
Carrera Farias, Miguel Ángel, Prieto-Marquez, Albert   +1 more
core   +2 more sources