Results 221 to 230 of about 211,638 (344)

The Unexpected Discovery of Paleocene? Coals in Outcrops Thought to Be Cambrian, Al Huqf, Oman

Journal of Petroleum Geology, EarlyView.
ABSTRACT Two brown organic deposits were encountered whilst investigating kaolinitic claystones thought to occur at the base of a Cambrian formation at outcrop. The age of these organic deposits is probably Paleocene from palynology. Organic petrography shows that they are subbituminous coals with some oil source potential.
Mohammed H. Al Kindi, Alan P. Heward, Lorraine B. Eglinton, Steve R. Packer, Darrin T. Stead   +4 more
wiley   +1 more source

Morphological disparity across the K-Pg boundary in mollusk shells: A theoretical morphology approach. [PDF]

PLoS One
Contreras-Figueroa G, Hendy AJW, Aragón JL.   +2 more
europepmc   +1 more source

Review: Short-term sea-level changes in a greenhouse world — A view from the Cretaceous

, 2016
B. Sames, M. Wagreich, J. Wendler, B. Haq, C. Conrad, M. Melinte-Dobrinescu, Xiumian Hu, I. Wendler, E. Wolfgring, İ. Yılmaz, S. Zorina   +10 more
semanticscholar   +1 more source

State shift in Deccan volcanism at the Cretaceous-Paleogene boundary, possibly induced by impact

Science, 2015
P. Renne, C. Sprain, M. Richards, S. Self, L. Vanderkluysen, K. Pande   +5 more
semanticscholar   +1 more source

Search for impact ejecta at the Paleocene–Eocene boundary

Meteoritics &Planetary Science, EarlyView.
Abstract Almost 10 years have passed since microtektites and microkrystites were reported for the Paleocene–Eocene (P–E) boundary in drill cores and outcrop in New Jersey and in ODP Hole 1051B in the western North Atlantic. The glassy spherules were interpreted to reflect an impact trigger for the Paleocene–Eocene Thermal Maximum (PETM).
Birger Schmitz, Yue Cai, Shiyong Liao, Victoriano Pujalte, Ting Ruan, Robert P. Speijer, Ellen Thomas   +6 more
wiley   +1 more source

U-Pb dating of volcaniclastic deposits from the Sinj Basin: implications for provenance and the tectono-sedimentary evolution of the External Dinarides. [PDF]

Int J Earth Sci
Šamarija R, Andrić-Tomašević N, Mandic O, Zeh A, Mužek K, Pavelić D, Schwotzer M.   +6 more
europepmc   +1 more source

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, EarlyView.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Palaeomagnetic and geochronologic results from lower cretaceous volcanics of the western Qiangtang terrane and implications for the Lhasa-Qiangtang collision. [PDF]

Sci Rep
Zhang Y, Bian W, Ma J, Wang S, Jiao X, Liang J, Wang S, Li X, Ding J, Zhao H, Li H, Wu H, Ma Y, Yang T.   +13 more
europepmc   +1 more source

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

Rapid mid-Cretaceous diversification of squid and cuttlefish preceded radiation into coastal niches. [PDF]

Nat Ecol Evol
Sanchez G, Fernández-Álvarez FÁ, Bernal A, Heath-Heckman E, Lami R, McFall-Ngai M, Nishiguchi M, Nyholm S, Simakov O, Allcock AL, Rokhsar DS.   +10 more
europepmc   +1 more source