نتایج جستجو برای: biostratigraphy
تعداد نتایج: 1134 فیلتر نتایج به سال:
Organically preserved algal microfossils from the Ringwood evaporite deposit in the Gillen Member of the Bitter Springs Formation (late Precambrian of central Australia) are of small size, low diversity, and probable prokaryotic affinities. These rather primitive characteristics appear to reflect the stressful conditions that prevailed in a periodically stagnant, hypersaline lagoon. This assemb...
The recently recognized aetosaur Tecovasuchus chatterjeei Martz and Small occurs at several localities in lower Chinle Group strata across Texas, New Mexico, and Arizona. Based on lithostratigraphic correlation and other vertebrate occurrences, all Tecovasuchus occurrences are of Adamanian age. Indeed, all occurrences are consistent with assignment to the St. Johnsian sub-land vertebrate faunac...
The Pannonian Palaeoecology and Biostratigraphy of Molluscs from Kostanjek - Medvednica Mt., Croatia
At Podsused near Zagreb, in an abandoned surface excavation of cement marls, near Kostanjek (Fig. 1) an 83 m thick lithostratigraphical column was investigated comprising layers of Sarmatian and Pannonian age. Five lithofacies units (A, AB, B, C, D) were separated on the basis of their structural-petrographic characteristics. From layers with greater concentrations of fossils, a rich community ...
This issue of Palaeogeography Palaeoclimatology Palaeoecology is devoted to papers on the Permian– Triassic boundary crisis and Early Triassic biotic recovery. It is an outgrowth of the Symposium on Early Triassic Chronostratigraphy and Biotic Recovery that was held in Chaohu, China, on May 21st–23rd, 2005 under the auspices of IGCP Project 467 and attended by about 200 Earth scientists with a ...
This monograph has been compiled by members of the Paleogene Planktonic Foraminifera Working Group (hereafter referred to as the Working Group) of the International Subcommission on Paleogene Stratigraphy, International Union of Geological Sciences. It is the second such work in a projected series of three, the first being the Atlas of Paleocene Planktonic Foraminifera published by Smithsonian ...
Fossils and artifacts recovered from the middle Awash Valley of Ethiopia's Afar depression sample the Middle Pleistocene transition from Homo erectus to Homo sapiens. Ar/Ar ages, biostratigraphy, and tephrachronology from this area indicate that the Pleistocene Bodo hominid cranium and newer specimens are approximately 0.6 million years old. Only Oldowan chopper and flake assemblages are presen...
Quilty, P.G., Whitehead, J. & Lewis, D. 2013 (17:xii): Age and palaeoenvironment of Pliocene sediments, Cameron Inlet Formation, eastern Flinders Island, Tasmania: implications for southeastern Australian biostratigraphy. Papers and Proceedings of the Royal Society of Tasmania 147: 51–83. ISSN 0080-4703. School of Earth Sciences, University of Tasmania, Private Bag 79, Hobart, Tasmania 7001, Au...
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