Author: Yasemin Ifakat TuluPublisher:
ISBN:
Category : Chondrichthyes
Languages : en
Pages : 472
Book Description
Diversity, Biogeography, and Taphonomy of Late Cretaceous Chondrichthyans from Montana
Author: Yasemin Ifakat TuluPublisher:
ISBN:
Category : Chondrichthyes
Languages : en
Pages : 472
Book Description
Taphonomy of Three Monospecific Dinosaur Bone Beds in the Late Cretaceous Two Medicine Formation, Northwestern Montana
Author: Raymond R. RogersPublisher:
ISBN:
Category : Dinosaurs
Languages : en
Pages : 204
Book Description
Taphonomy of Jack's Birthday Site, a Diverse Dinosaur Bonebed from the Upper Cretaceous Two Medicine Formation of Montana
Author: Taphonomy of the Sun River Bonebed, Late Cretaceous (Campanian) Two Medicine Formation of Montana
Author: Benjamin Andrew ScherzerPublisher:
ISBN:
Category : Debris avalanches
Languages : en
Pages : 216
Book Description
In the summer of 1998, a bonebed of juvenile dinosaur material was found in beds of the Two Medicine Formation along the Sun River in Teton County, Montana. Initial inspection of the "Sun River Bonebed" indicated unique dominance by juvenile remains and unusually high concentration of fossil material. Modern exposure of both the bonebed and surrounding strata allowed for a detailed taphonomic study of the assemblage. In the summer of 2004, the bonebed was excavated in a fashion that recorded depthwise taphonomic data of fossil material and surrounding sediment, and allowed for three-dimensional reconstruction of the bonebed. The lithology of the surrounding beds was documented for 120 m immediately below and 40 m immediately above the bonebed to interpret the overall depositional environment of the area. Lastly, the paleobiologic and sedimentologic interpretations made for the bonebed were compared to bonebeds of similar fauna in the Two Medicine Formation. Taphonomic attributes of the fossil material indicate a mass death assemblage of late juvenile lambeosaurines subject to post-mortem bioturbation and possible fluvial transport. A number of elements from the assemblage exhibit a rare form of taphonomic modification known as "wet rot," currently documented in only one other dinosaur bonebed. Sedimentologic and additional taphonomic data in the assemblage indicate entrainment of the vertebrate material in a cohesive debris flow and ultimate deposition in the respective flow deposit. The sedimentology of the surrounding beds indicates ultimate deposition in an ephemeral fluvial environment. The restricted age class representation of the assemblage lends credence to existing paleobiologic interpretations of hadrosaurids in the Late Cretaceous of Montana, and the Sun River Bonebed is significant in its exhibition of "wet rot" modification and in being one of a restricted number of documented debris-flow hosted vertebrate bonebeds.
Sedimentology and Taphonomy of a Dinosaur Bonebed from the Upper Cretaceous (Campanian) Judith River Formation of North Central Montana
Author: Jeffrey William LaRockPublisher:
ISBN:
Category : Dinosaurs
Languages : en
Pages : 122
Book Description
Comparative Taphonomy and Paleoecological Reconstruction of Two Microvertebrate Accumulations from the Late Cretaceous Hell Creek Formation (Maastrichtian), Eastern Montana
Author: Comparative Taphonomy and Paleoecological Reconstruction of Two Microvertebrate Accumulations from the Late Cretaceous (Maastrichtian) Hell Creek Formation, Eastern Montana
Author: Laura Elizabeth WilsonPublisher:
ISBN:
Category : Hell Creek Formation
Languages : en
Pages : 212
Book Description
The CM assemblage is dominated by tabular, low density elements such as cycloid scales and fish vertebrae. Dense, equidimensional elements such as teeth and ganoid fish scales dominate the JPC assemblage. Transport distances, hydraulic equivalencies of dominant skeletal elements, amount of hydraulic sorting and reworking, and degree of time-averaging varies between deposits and significantly affect taxonomic distributions. Chi-squared tests and rank order analysis results demonstrate that relative abundance of taxa can be determined for portions of the assemblages despite different taphonomic processes. Most notably, relative abundance of hydraulically equivalent skeletal elements from morphologically similar organisms can be compared regardless of accumulation in non-isotaphonomic deposits. Statistical comparisons were made among osteichthians using ganoid scales, caudates using vertebrae, ornithischians using teeth, and testudinates using shell fragments. Results show that portions of the assemblage analyzed using hydrodynamically equivalent elements are not significantly different.
At the Top of the Grand Staircase
Author: Alan L. TitusPublisher: Indiana University Press
ISBN: 0253008964
Category : Science
Languages : en
Pages : 657
Book Description
The Grand Staircase-Escalante National Monument is the location of one of the best-known terrestrial records for the late Cretaceous. Prior fieldwork confirmed the richness of the area, but a major effort begun in the new century has documented over 2,000 new vertebrate fossil sites, provided new radiometric dates, and identified five new genera of ceratopsids, two new species of hadrosaur, a probable new genus of hypsilophodontid, new pachycephalosaurs and ankylosaurs, several kinds of theropods (including a new genus of oviraptor and a new tyrannosaur), plus the most complete specimen of a Late Cretaceous therizinosaur ever collected from North America, and much more. The research documented in this book is rewriting our understanding of Late Cretaceous paleobiogeography and dinosaur phyletics. At the Top of the Grand Staircase: The Late Cretaceous of Southern Utah is a major stepping stone toward a total synthesis of the ecology and evolution of the Late Cretaceous ecosystems of western North America.
Cretaceous Period: Biotic Diversity and Biogeography
Author: Ashu KhoslaPublisher: New Mexico Museum of Natural History and Science
ISBN:
Category : Amphibians, Fossil
Languages : en
Pages : 346
Book Description
Vertebrate Paleontology in Utah
Author: David D. GillettePublisher: Utah Geological Survey
ISBN: 1557916349
Category : Nature
Languages : en
Pages : 568
Book Description
The 52 papers in this vary in content from summaries or state-of-knowledge treatments, to detailed contributions that describe new species. Although the distinction is subtle, the title (Vertebrate Paleontology in Utah) indicates the science of paleontology in the state of Utah, rather than the even more ambitious intent if it were given the title “Vertebrate Paleontology of Utah” which would promise an encyclopedic treatment of the subject. The science of vertebrate paleontology in Utah is robust and intense. It has grown prodigiously in the past decade, and promises to continue to grow indefinitely. This research benefits everyone in the state, through Utah’s muse ums and educational institutions, which are the direct beneficiaries.