Biogeochemical and stable carbon isotopic analysis of black-shale sequences deposited during an Albian oceanic anoxic event (112 million years ago) indicate that up to 80 weight percent of sedimentary organic carbon is derived from marine, nonthermophilic archaea. The carbon-13 content of archaeal molecular fossils indicates that these archaea were living chemoautotrophically.
The project has the hallmarks of forming a significant new sediment-hosted copper-silver district, with high-grades of up to 8.3% copper and 109 g/t silver from an intra-continental salt bearing.
16S rRNA gene sequence analysis of isolates from surface hypersaline environments and ancient evaporites have failed to show consistent differences in gene sequence between isolates from different.
Cretaceous Sequence W-E – 40 23. SoSo Field, Jasper and Jones Counties, Index Map and Strati graphic section showing Lower Cretaceous Sequence N-S 40 24. cranfield field, Adams and Franklin Counties, Structure Map, Datum, Top of Paluxy – 40 25. Cranfield Field, Adams County, Stratigraphic Section showing Lower Cretaceous Sequence S-S’ _ 48 26.
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Geological Society of America Special Paper 356 2002 125 Cretaceous-Tertiary boundary sequence in the Cacarajicara Formation, western Cuba: An impact-related, high-energy, gravity-ow deposit
Abstract The Turonian stromatolite-bearing condensed sequence in the Polish Jura Chain (the european epicontinental basin) provides good insight into the environment of formation of Cretaceous phosphatic stromatolites, owing to their purely phosphatic development and negligible post-depositional alteration.
Sequence stratigraphy is one of the primary tools for the evaluation of sea-level change throughout Earth history and provides a powerful framework for re- gional and global correlation on multiple time scales (Haq et al. 1987, Hardenbol et al. 1998, Simmons et al. 2007).
The tectonic history of the region started by rifting in the Permo-Triassic, which evolved into a passive margin in the Middle Jurassic and into active margin in the late Cretaceous owing to the onset of Arabia-Eurasia convergence and formation of the Zagros and Taurus orogenic belts (stcklin, 1968
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Repeated again and again, this sequence of species production and character displacement in sympatry can produce a clade of endemic island taxa that are adapted and specialized to use a broad spectrum.
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Structural Interpretation and Sequence Stratigraphy and Correlation 12 in more detail and the concepts of marine sequence stratigraphy are applied to the nonmarine closed basins . sensu . Keighley . et al. (2003). The Upper Jurassic-Lower Cretaceous of the CMBR is characterized by volcanic and fluvial-alluvial rocks in a