Filtering by Subject: Astrophysics and Astronomy

A fossiliferous spherule-rich bed at the Cretaceous-Paleogene (K-Pg) boundary in Mississippi, USA: implications for the K-Pg mass extinction event in the MS Embayment and Eastern Gulf Coastal Plain

James Witts, Neil H. Landman, Matthew P. Garb, et al.

Published: 2018-06-15
Subjects: Astrophysics and Astronomy, Earth Sciences, Geochemistry, Geology, Paleobiology, Paleontology, Physical Sciences and Mathematics, Sedimentology

We describe an outcrop of the Cretaceous–Paleogene (K–Pg) boundary exposed due to construction near New Albany, Union County, Mississippi. It consists of the Owl Creek Formation and overlying Clayton Formation. The Owl Creek Formation is rich in the ammonites Discoscaphites iris and Eubaculites carinatus, which, along with biostratigraphically important dinoflagellate cysts and calcareous [...]

Stratigraphy of Aeolis Dorsa, Mars: stratigraphic context of the great river deposits

Edwin S Kite, Alan Howard, Antoine Lucas, et al.

Published: 2018-04-03
Subjects: Astrophysics and Astronomy, Earth Sciences, Other Earth Sciences, Physical Sciences and Mathematics, The Sun and the Solar System

Unraveling the stratigraphic record is the key to understanding ancient climate and past climate changes on Mars (Grotzinger et al. 2011). Stratigraphic records of river deposits hold particular promise because rain or snowmelt must exceed infiltration plus evaporation to allow sediment transport by rivers. Therefore, river deposits when placed in stratigraphic order could constrain the number, [...]


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