Download or read book Taphonomy of the Sun River Bonebed Late Cretaceous Campanian Two Medicine Formation of Montana written by Benjamin Andrew Scherzer and published by . This book was released on 2008 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Sedimentology and Taphonomy of a Dinosaur Bonebed from the Upper Cretaceous Campanian Judith River Formation of North Central Montana written by Jeffrey William LaRock and published by . This book was released on 2000 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Taphonomy of Jack s Birthday Site a Diverse Dinosaur Bonebed from the Upper Cretaceous Two Medicine Formation of Montana written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Taphonomy of Three Monospecific Dinosaur Bone Beds in the Late Cretaceous Two Medicine Formation Northwestern Montana written by Raymond R. Rogers and published by . This book was released on 1989 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acta palaeontologica Polonica written by and published by . This book was released on 2008 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Jack s Birthday Site a Diverse Dinosaur Bonebed from the Cretaceous Two Medicine Formation of Montana written by David Joseph Varricchio and published by . This book was released on 1995 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of Vertebrate Paleontology written by and published by . This book was released on 2005 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Diversity Biogeography and Taphonomy of Late Cretaceous Chondrichthyans from Montana written by Yasemin Ifakat Tulu and published by . This book was released on 2010 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparative Taphonomy and Paleoecological Reconstruction of Two Microvertebrate Accumulations from the Late Cretaceous Hell Creek Formation Maastrichtian Eastern Montana written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of a Regionally Significant Terrestrial Bounding Surface in the Upper Cretaceous Two Medicine Formation Northwestern Montana written by Bolton J. Howes and published by . This book was released on 2015 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro-scale data recovered from a fluvial disconformity support the identification of a sequence boundary in fully terrestrial strata of the ZUpper Cretaceous (Campanian) Two Medicine Formation in northwestern Montana. This sandstone was previously interpreted as a sequence boundary based on several meters of internal erosional scour, a thick and laterally persistent intraclast lag facies, and pervasive oxidation that mark the disconformity. Recognition of numerous outcrop scale features supports the contention that this fluvial disconformity is a sequence boundary. Physical stratigraphic evidence and associated age data indicate that this fluvial disconformity correlates with widespread erosion and base level fall in distal parts of the basin that transpired at ~81 Ma. Data indicate that the fluvial disconformity in the lower Two Medicine Formation feflects a negative base-level adjustment that occurred at the end of the Telegraph Creek-Eagle regression (R7). Paralic deposits of the subsequent Claggett transgression (T8) overlie the disconformity. Recognition of this disconformity is significant because it is one of very few well-documented examples of a nonmarine sequence boundary. Detrital composition data indicate that there are no significant compositional changes across the sequence boundary. Sandstones spanning the disconformity can be classified as litharenites, and all yield abundant volcanic rock fragments. There is no apparent change in provenance across the sequence boundary. in contrast, there is a distinct diagenetic signature associated with the sequence boundary, as evidenced by changes in the cement/framework grain ratio, grain packing, and grain deformation. Abundant calcite cement and loose grain packing characterize the sandstone body hosting the sequence boundary. Less ce3ment, tighter grain packing, and post-depositional deformation characterize fluvial sandstones intercalated below tha above sequence boundary.

Download or read book Comparative Taphonomy and Paleoecological Reconstruction of Two Microvertebrate Accumulations from the Late Cretaceous Maastrichtian Hell Creek Formation Eastern Montana written by Laura Elizabeth Wilson and published by . This book was released on 2006 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Palynology of the Upper Campanian cretaceous Judith River Formation North central Montana written by Geological Survey (U.S.) and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2015 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Experimental and Field based Approach to the Taphonomy of Microvertebrate Assemblages written by Mara E. Brady and published by . This book was released on 2005 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study explores the origin of concentrations of small fossil bones and teeth preserved in (1) pond/lake and (2) active channel deposits in the Judith River Formation of Montana. Vertebrate fossils recovered from both types of assemblages are similar in shape and rounding, but channel concentrations are better sorted. In flume experiments, bone concentrations formed when an active flow was directed through sediment beds with initially dispersed bone material. The coarse bone fraction was minimally transported, while the fine fraction was winnowed to distal parts of the flume. These results suggest channel assemblages may be derived from pre-existing pond/lake assemblages.

Download or read book Dinosaur Provincial Park written by Philip J. Currie and published by Indiana University Press. This book was released on 2005 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This comprehensive history of a remarkable window into the history of the earth will be required reading for everyone interested in the life of the past."--BOOK JACKET.

Download or read book Vertebrate Paleontology in Utah written by David D. Gillette and published by Utah Geological Survey. This book was released on 1999 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Bonebeds written by Raymond R. Rogers and published by University of Chicago Press. This book was released on 2010-02-15 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vertebrate fossil record extends back more than 500 million years, and bonebeds—localized concentrations of the skeletal remains of vertebrate animals—help unlock the secrets of this long history. Often spectacularly preserved, bonebeds—both modern and ancient—can reveal more about life histories, ecological associations, and preservation patterns than any single skeleton or bone. For this reason, bonebeds are frequently studied by paleobiologists, geologists, and archeologists seeking to piece together the vertebrate record. Thirteen respected researchers combine their experiences in Bonebeds, providing readers with workable definitions, theoretical frameworks, and a compendium of modern techniques in bonebed data collection and analysis. By addressing the historical, theoretical, and practical aspects of bonebed research, this edited volume—the first of its kind—provides the background and methods that students and professionals need to explore and understand these fantastic records of ancient life and death.