منابع مشابه
Holocene Vertebrate Fossils from Isla Floreana, Galapagos
Steadman, David W. Holocene Vertebrate Fossils from Isla Floreana, Galapagos. Smithsonian Contributions to Zoology, number 413, 103 pages, 25 figures, 4 plates, 12 tables, 1986.—This study surveys the late Holocene vertebrate fossil record from Isla Floreana, Galapagos. Over 20,000 fossils from four lava tubes in the arid lowlands near Post Office Bay are associated with six radiocarbon dates o...
متن کاملTriassic Vertebrate Fossils in Arizona
The Triassic System in Arizona has yielded numerous world-class fossil specimens, including numerous type specimens. The oldest Triassic vertebrates from Arizona are footprints and (largely) temnospondyl bones from the Nonesian (Early Triassic: Spathian) Wupatki Member of the Moenkopi Formation. The Perovkan (early Anisian) faunas of the Holbrook Member of the Moenkopi Formation are exceptional...
متن کاملNon-Retroviral Fossils in Vertebrate Genomes
Although no physical fossils of viruses have been found, retroviruses are known to leave their molecular fossils in the genomes of their hosts, the so-called endogenous retroviral elements. These have provided us with important information about retroviruses in the past and their co-evolution with their hosts. On the other hand, because non-retroviral viruses were considered not to leave such f...
متن کاملScenes from the past: initial investigation of early jurassic vertebrate fossils with multidetector CT.
The study of fossils permits the reconstruction of past life on our planet and enhances our understanding of evolutionary processes. However, many fossils are difficult to recognize, being encased in a lithified matrix whose tedious removal is required before examination is possible. The authors describe the use of multidetector computed tomography (CT) in locating, identifying, and examining f...
متن کاملPerspectives from fossils and phylogenies
Over half of all described species are insects, but until recently our understanding of the reasons for this diversity was based on very little macroevolutionary evidence. Here I summarize the hypotheses that have been posed, tests of these hypotheses and their results, and hence identify gaps in knowledge for future researchers to pursue. I focus on inferences from the following sources: (i) t...
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ژورنال
عنوان ژورنال: American Journal of Science
سال: 1914
ISSN: 0002-9599
DOI: 10.2475/ajs.s4-37.218.141