New Age Constraints for the Salamanca Formation and Lower Río Chico Group in the Western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene Extinction Recovery and Land Mammal Age Correlations

  title={New Age Constraints for the Salamanca Formation and Lower R{\'i}o Chico Group in the Western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene Extinction Recovery and Land Mammal Age Correlations},
  author={William C. Clyde and Peter Wilf and Ari Iglesias and Rudy Slingerland and Timothy J Barnum and Peter K. Bijl and Timothy J. Bralower and Henk Brinkhuis and Emily E. Comer and Brian T. Huber and Mauricio Ib{\'a}{\~n}ez-Mejia and Brian R. Jicha and J. Marcelo Krause and Jonathan Douglas Schueth and Brad S. Singer and Mar{\'i}a Sol Raigemborn and Mark D. Schmitz and Appy Sluijs and Maria C. Zamaloa},
  journal={Geological Society of America Bulletin},
The Salamanca Formation of the San Jorge Basin (Patagonia, Argentina) preserves critical records of Southern Hemisphere Paleocene biotas, but its age remains poorly resolved, with estimates ranging from Late Cretaceous to middle Paleocene. We report a multi-disciplinary geochronologic study of the Salamanca Formation and overlying Rio Chico Group in the western part of the basin. New constraints include (1) an 40Ar/39Ar age determination of 67.31 ± 0.55 Ma from a basalt flow underlying the… 

New age constraints for early Paleogene strata of central Patagonia, Argentina: Implications for the timing of South American Land Mammal Ages

The Rio Chico Group in the San Jorge Basin of central Patagonia (Argentina) preserves some of South America’s most significant Paleogene records of biotic and climatic change. Three of its


Abstract We here investigate the sedimentology of the early Danian (ca. 66–64 Ma) Salamanca Formation in the north-central San Jorge Basin, southern Chubut Province, Patagonia, Argentina, in order to

Constructing a time scale of biotic recovery across the Cretaceous–Paleogene boundary, Corral Bluffs, Denver Basin, Colorado, U.S.A.

The Cretaceous–Paleogene (K–Pg) boundary interval represents one of the most significant mass extinctions and ensuing biotic recoveries in Earth history. Earliest Paleocene fossil mammal faunas

Constructing a Timescale of Biotic Recovery across the Cretaceous–Paleogene Boundary, Corral Bluffs, Denver Basin, Colorado

A new high-resolution magnetostratigraphy of 10 lithostratigraphic sections spanning the K–Pg boundary interval at Corral Bluffs located east of Colorado Springs in the southern part of the Denver Basin is presented.

Cretaceous Intraplate Contraction in Southern Patagonia: A Far‐Field Response to Changing Subduction Dynamics?

The origin, extent, and timing of intraplate contraction in Patagonia are among the least understood geological processes of southern South America. Particularly, the intraplate Deseado fold‐thrust

A New Chronology for Middle Eocene-Early Miocene South American Land Mammal Ages

Cenozoic South American Land Mam- mal Ages (SALMAs) have historically been correlated to the geologic time scale using 40 Ar/ 39 Ar dating and magnetostratigraphy. At Gran Barranca (68.7°W,

High-resolution calibration of Eocene strata: 40Ar/39Ar geochronology of biotite in the Green River Formation

The Sixth tuff of the Wilkins Peak Member of the Green River Formation is an important potential calibration point for magnetic stratigraphy, mammalian evolution, and lacustrine processes. However,

New Paleomagnetic and Stable‐Isotope Results from the Nanxiong Basin, China: Implications for the K/T Boundary and the Timing of Paleocene Mammalian Turnover

The Nanxiong Basin (Guangdong Province, China) preserves the most complete Asian stratigraphic record of the Cretaceous‐Paleogene (K/Pg) boundary extinction and the subsequent Paleocene mammalian

Chronostratigraphy of the mammal-bearing Paleocene of South America


Abstract:  The oldest Cenozoic mammalian assemblages in South America have been recovered from levels of the Hansen Member of the Salamanca Formation, Punta Peligro locality in Argentina, and from

Late Cretaceous to Miocene sea‐level estimates from the New Jersey and Delaware coastal plain coreholes: an error analysis

Sea level has been estimated for the last 108 million years through backstripping of corehole data from the New Jersey and Delaware Coastal Plains. Inherent errors due to this method of calculating

A Paleocene lowland macroflora from Patagonia reveals significantly greater richness than North American analogs

Few South American macrofloras of Paleocene age are known, and this limits our knowledge of diversity and composition between the end-Cretaceous event and the Eocene appearance of high floral

U-Pb-Hf characterization of the central Coast Mountains batholith: Implications for petrogenesis and crustal architecture

We present U-Pb geochronologic and Hf isotopic data from 29 plutonic samples within the Coast Mountain batholith, north-coastal British Columbia and southeast Alaska. Hf isotopic values do not

Asociaciones de fósiles y hiatos en el Supracretácico-Neogeno de Patagonia: una perspectiva estratigraficosecuencial

The Maastrichtian through Miocene series in the midplate San Jorge Basin contains rich and comprehensively studied vertebrate and invertebrate fossil assemblages. These strata reflect a depositional