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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Egypt (1)
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Tunisia
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El Kef Tunisia (2)
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West Africa
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Niger River (1)
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Asia
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Far East
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China
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Indian Peninsula
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Middle East
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Israel (2)
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Atlantic Ocean
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North Atlantic
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Blake Plateau
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Gulf of Mexico
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South Atlantic
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Red River (1)
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United States
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Alabama (1)
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New Mexico (1)
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Texas
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Galveston Bay (2)
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Lubbock Lake (1)
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McLennan County Texas
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Waco Texas (1)
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Milam County Texas (1)
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Tarrant County Texas
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Tombigbee River (1)
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commodities
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petroleum (3)
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elements, isotopes
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carbon
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C-13/C-12 (7)
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C-14 (2)
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isotope ratios (7)
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isotopes
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radioactive isotopes
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C-14 (2)
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stable isotopes
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C-13/C-12 (7)
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O-18/O-16 (7)
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metals
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alkaline earth metals
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magnesium (1)
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platinum group
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iridium (2)
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oxygen
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O-18/O-16 (7)
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fossils
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Chordata
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Vertebrata (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Insecta (1)
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Mollusca (2)
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Protista
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Foraminifera
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Rotaliina
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Globigerinacea
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Globigerinoides
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Globigerinoides ruber (1)
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Globigerinoides sacculifer (1)
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Globorotaliidae
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Globorotalia (1)
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Neogloboquadrina
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Nodosariacea
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Nodosariidae
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Lenticulina (1)
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microfossils (14)
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palynomorphs (1)
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Plantae
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algae
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calcareous algae (1)
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diatoms (1)
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nannofossils (1)
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thallophytes (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Blackwater Draw Formation (1)
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upper Quaternary (1)
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Tertiary
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lower Tertiary (2)
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Paleogene
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Calvert Bluff Formation (1)
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Eocene
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middle Eocene
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Yegua Formation (1)
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Paleocene
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lower Paleocene
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Danian (3)
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Wilcox Group (1)
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Mesozoic
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K-T boundary (10)
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minerals
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illite (1)
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Primary terms
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absolute age (1)
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Africa
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North Africa
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Egypt (1)
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Tunisia
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El Kef Tunisia (2)
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West Africa
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Niger River (1)
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Nigeria (1)
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Asia
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Far East
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China
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Yangtze River (1)
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Indian Peninsula
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India (1)
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Middle East
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Israel (2)
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Atlantic Ocean
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North Atlantic
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Blake Plateau
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Blake Nose (1)
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Gulf of Mexico
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Pigmy Basin (1)
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South Atlantic
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Walvis Ridge (1)
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biogeography (1)
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carbon
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C-13/C-12 (7)
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C-14 (2)
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Caribbean region
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West Indies
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Antilles
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Greater Antilles
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Cuba (1)
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Hispaniola
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Haiti
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Beloc Haiti (1)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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Blackwater Draw Formation (1)
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upper Pleistocene (2)
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upper Quaternary (1)
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Tertiary
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lower Tertiary (2)
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Paleogene
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Calvert Bluff Formation (1)
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Eocene
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middle Eocene
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Yegua Formation (1)
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Paleocene
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lower Paleocene
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Danian (3)
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K-T boundary (10)
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Wilcox Group (1)
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Central America
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Belize (1)
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Chordata
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Vertebrata (1)
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Deep Sea Drilling Project
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IPOD
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Leg 74
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deformation (1)
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Europe
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Western Europe
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Iceland
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Invertebrata
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Ostracoda (1)
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Insecta (1)
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Mollusca (2)
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Protista
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Foraminifera
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Rotaliina
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Globigerinacea
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Globigerinoides
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Globigerinoides ruber (1)
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Globigerinoides sacculifer (1)
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Globorotaliidae
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Globorotalia (1)
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Neogloboquadrina
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Neogloboquadrina dutertrei (1)
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Nodosariacea
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Lenticulina (1)
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isotopes
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radioactive isotopes
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C-14 (2)
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stable isotopes
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C-13/C-12 (7)
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O-18/O-16 (7)
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Mesozoic
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Cretaceous
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K-T boundary (10)
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Triassic (1)
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metals
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Mexico (2)
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ocean basins (1)
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Brazos River
Fluvial response to Late Pleistocene–Holocene climate change in the Colorado River drainage, central Texas, USA: REPLY
Global sea-level rise increased during the twentieth century from 1.5 to 3.0 mm/yr and is expected to at least double over the next few decades. The Western Louisiana and Texas coast is especially vulnerable to sea-level rise due to low gradients, high subsidence, and depleted sediment supply. This Memoir describes the regional response of coastal environments to variable rates of sea-level rise and sediment supply during Holocene to modern time. It is based on results from more than six decades of research focused on coastal and nearshore stratigraphic records. The results are a wake-up call for those who underestimate the potential magnitude of coastal change over decadal to centennial time scales, with dramatic changes caused by accelerated sea-level rise and diminished sediment supply.
Hot atmospheric formation of carbonate accretionary lapilli at the Cretaceous-Paleogene boundary, Brazos River, Texas, from clumped isotope thermometry
Autogenic delta progradation during sea-level rise within incised valleys
Morphodynamic equilibrium of lowland river systems during autoretreat
Timing Recovery After the Cretaceous/paleogene Boundary: Evidence from the Brazos River, Texas, Usa
Use of novel high-resolution 3D marine seismic technology to evaluate Quaternary fluvial valley development and geologic controls on shallow gas distribution, inner shelf, Gulf of Mexico
Effects of Deccan volcanism on paleoenvironment and planktic foraminifera: A global survey
Deccan volcanism, one of Earth's largest flood basalt provinces, erupted ~80% of its total volume (phase 2) during a relatively short time in the uppermost Maastrichtian paleomagnetic chron C29r and ended with the Cretaceous-Tertiary boundary mass extinction. Full biotic recovery in the marine realm was delayed at least 500 k.y. or until after the last Deccan eruptions in C29n (phase 3, 14% of the total Deccan volume). For over 30 yr, the mass extinction has been commonly attributed to the Chicxulub impact, and the delayed recovery remained an enigma. Here, we demonstrate that the two phases of Deccan volcanism can account for both the mass extinction and delayed marine recovery. In India, a direct correlation between Deccan eruptions (phase 2) and the mass extinction reveals that ~50% of the planktic foraminifer species gradually disappeared during volcanic eruptions prior to the first of four lava megaflows, reaching ~1500 km across India, and out to the Bay of Bengal. Another 50% disappeared after the first megaflow, and the mass extinction was complete with the last megaflow. Throughout this interval, blooms of the disaster opportunist Guembelitria cretacea dominate shallow-marine assemblages in coeval intervals from India to the Tethys and the Atlantic Oceans to Texas. Similar high-stress environments dominated by blooms of Guembelitria and/or Globoconusa are observed correlative with Deccan volcanism phase 3 in the early Danian C29n, followed by full biotic recovery after volcanism ended. The mass extinction and high-stress conditions may be explained by the intense Deccan volcanism leading to rapid global warming and cooling in C29r and C29n, enhanced weathering, continental runoff, and ocean acidification, resulting in a carbonate crisis in the marine environment.
Paleoecology of the K-Pg mass extinction survivor Guembelitria (Cushman): isotopic evidence from pristine foraminifera from Brazos River, Texas (Maastrichtian)
Digital Rendering of Sedimentary-Relief Peels: Implications for Clastic Facies Characterization and Fluid Flow
Impact-Induced Sediment Deposition On An Offshore, Mud-Substrate Continental Shelf, Cretaceous–Paleogene Boundary, Brazos River, Texas, U.S.A
Rapid Mud Accumulation On the Central Texas Shelf Linked To Climate Change and Sea-Level Rise
Quantitative Modeling of the Evolution and Geometry of Incised Valleys
Carbonate accretionary lapilli in distal deposits of the Chicxulub impact event
Impact stratigraphy is an extremely useful correlation tool that makes use of unique events in Earth's history and places them within spatial and temporal contexts. The K-T boundary is a particularly apt example to test the limits of this method to resolve ongoing controversies over the age of the Chicxulub impact and whether this impact is indeed responsible for the K-T boundary mass extinction. Two impact markers, the Ir anomaly and the Chicxulub impact spherule deposits, are ideal because of their widespread presence. Evaluation of their stratigraphic occurrences reveals the potential and the complexities inherent in using these impact signals. For example, in the most expanded sedimentary sequences: (1) The K-T Ir anomaly never contains Chicxulub impact spherules, whereas the Chicxulub impact spherule layer never contains an Ir anomaly. (2) The separation of up to 9 m between the Ir anomaly and spherule layer cannot be explained by differential settling, tsunamis, or slumps. (3) The presence of multiple spherule layers with the same glass geochemistry as melt rock in the impact breccia of the Chicxulub crater indicates erosion and redeposition of the original spherule ejecta layer. (4) The stratigraphically oldest spherule layer is in undisturbed upper Maastrichtian sediments (zone CF1) in NE Mexico and Texas. (5) From central Mexico to Guatemala, Belize, Haiti, and Cuba, a major K-T hiatus is present and spherule deposits are reworked and redeposited in early Danian (zone P1a) sediments. (6) A second Ir anomaly of cosmic origin is present in the early Danian. This shows that although impact markers represent an instant in time, they are subject to the same geological forces as any other marker horizons—erosion, reworking, and redeposition—and must be used with caution and applied on a regional scale to avoid artifacts of redeposition. For the K-T transition, impact stratigraphy unequivocally indicates that the Chicxulub impact predates the K-T boundary, that the Ir anomaly at the K-T boundary is not related to the Chicxulub impact, and that environmental upheaval continued during the early Danian with possibly another smaller impact and volcanism.