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Author: Smithsonian Institution
Publisher:
ISBN:
Category : Paleobiology
Languages : en
Pages : 248
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Book Description
Author: Smithsonian Institution
Publisher:
ISBN:
Category : Paleobiology
Languages : en
Pages : 248
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Book Description
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 376
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Author: Smithsonian Institution
Publisher:
ISBN:
Category : Paleobiology
Languages : en
Pages :
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Author: Robert J. Emry
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 44
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Book Description
The early history of the Sciuridae is not well known, squirrels being generally poorly represented in the Tertiary fossil record. A nearly complete skeleton, recently discovered in early Oligocene deposits of Wyoming, represents what may be the oldest fossil squirrel known. For the first time, this early squirrel can be compared fully with its extant relatives. The specimen, assigned to Protosciurus jeffersoni, retains the primitive protrogomorphous zygomasseteric structure, as in other known Protosciurus, but the masseteric fossa of the mandible is farther forward than in most nonsciurid protrogomorphs. The auditory region of the skull has derived squirrel characters, but it is in the postcranial skeleton where similarities to extant squirrels are most apparent. Except for minor differences in joint construction, the skeleton is strikingly similar to that of Sciurus niger, the living fox squirrel. It differs from extant ground squirrels in the more gracile proportions of its long bones and asymmetry of foot construction. This early member of the squirrel family was clearly an arboreal squirrel, with morphology, and presumably habits, very similar to those of extant Sciurinae.
Author: Sergio F. Vizcaíno
Publisher: Cambridge University Press
ISBN: 1139576410
Category : Science
Languages : en
Pages : 381
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Coastal exposures of the Santa Cruz Formation in southern Patagonia have been a fertile ground for recovery of Early Miocene vertebrates for more than 100 years. This volume presents a comprehensive compilation of important mammalian groups which continue to thrive today. It includes the most recent fossil finds as well as important new interpretations based on ten years of fieldwork by the authors. A key focus is placed on the paleoclimate and paleoenvironment during the time of deposition in the Middle Miocene Climatic Optimum (MMCO) between twenty and fifteen million years ago. The authors present the first reconstruction of what climatic conditions were like and present important new evidence of the geochronological age, habits and community structures of fossil bird and mammal species. Academic researchers and graduate students in paleontology, paleobiology, paleoecology, stratigraphy, climatology and geochronology will find this a valuable source of information about this fascinating geological formation.
Author:
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ISBN:
Category : Zoology
Languages : en
Pages : 542
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Author: Matthew T. Carrano
Publisher: University of Chicago Press
ISBN: 0226094782
Category : Nature
Languages : en
Pages : 554
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Book Description
Living amniotes—including all mammals, birds, crocodilians, snakes, and turtles—comprise an extraordinarily varied array of more than 21,000 species. Found in every major habitat on earth, they possess a truly remarkable range of morphological, ecological, and behavioral adaptations. The fossil record of amniotes extends back three hundred million years and reveals much about modern biological diversity of form and function. A collaborative effort of twenty-four researchers, Amniote Paleobiology presents thirteen new and important scientific perspectives on the evolution and biology of this familiar group. It includes new discoveries of dinosaurs and primitive relatives of mammals; studies of mammalian chewing and locomotion; and examinations of the evolutionary process in plesiosaurs, mammals, and dinosaurs. Emphasizing the rich variety of analytical techniques available to vertebrate paleontologists—from traditional description to multivariate morphometrics and complex three-dimensional kinematics—Amniote Paleobiology seeks to understand how species are related to each other and what these relationships reveal about changes in anatomy and function over time. A timely synthesis of modern contributions to the field of evolutionary studies, Amniote Paleobiology furthers our understanding of this diverse group.
Author:
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Category : Government publications
Languages : en
Pages :
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Author: Grant Heiken
Publisher:
ISBN:
Category : Volcanic ash, tuff, etc
Languages : en
Pages : 430
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Author: George Herbert Girty
Publisher:
ISBN:
Category : Paleontology
Languages : en
Pages : 724
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