Results 71 to 80 of about 2,124,047 (278)

Araguainha Dome, Brazil: A polygonal impact structure due to a complex pre‐impact regional structural framework

Meteoritics &Planetary Science, EarlyView.
Abstract We investigated the structural framework of the north–northwestern Paraná Basin in Brazil to test whether the pre‐impact structures in this region may have had any influence on the first‐order formation and morphostructure of the Araguainha impact structure (AIS).
Renato B. Bernardes, Wolf U. Reimold, Roger L. Gibson, Julia B. Curto Ma, Adolfo B. Silva, Natalia Hauser   +5 more
wiley   +1 more source

Welsh Basin [PDF]

, 2011
The Cambrian rocks of Wales mostly lie within the Avalon composite terrane, apart from a small area of Cambrian rocks of the Monian composite terrane that is discussed in Chapter 9.
Molyneux, S.G., Rushton, A.W.A.
core  

Climate change and the selective signature of the Late Ordovician mass extinction [PDF]

, 2012
Selectivity patterns provide insights into the causes of ancient extinction events. The Late Ordovician mass extinction was related to Gondwanan glaciation; however, it is still unclear whether elevated extinction rates were attributable to record ...
Finnegan, Seth, Fischer, Woodward W., Heim, Noel A., Peters, Shanan E.   +3 more
core   +3 more sources

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Upper Ordovician cryptostomatid bryozoans and microfossils from the Don Braulio Formation, Eastern Precordillera, Argentina [PDF]

, 2014
En la clásica sección de la Quebrada de Don Braulio, en la Precordillera Oriental de la Provincia de San Juan, afora la Formación Don Braulio de edad hirnantiana.
Beresi, Matilde Sylvia, Heredia, Susana Emma, Jiménez Sánchez, Andrea, Mestre García, Ana Isabel   +3 more
core  

Guanyinqiao Member lithofacies of the Upper Ordovician Wufeng Formation around the Sichuan Basin and the significance to shale gas plays, SW China

, 2016
The stratigraphic distribution and lithofacies features of the Guanyinqiao Member of the Upper Ordovician Wufeng Formation around the Sichuan Basin were studied based on the data of drilling, outcrops, rock minerals, geochemistry and logging.
Yuman Wang, D. Dong, Jinliang Huang, Xinjing Li, Shufang Wang   +4 more
semanticscholar   +1 more source

Paleozoic geology of the Round Mountain area, Blanco quadrangle, Texas [PDF]

, 1929
Geological ...
Hancock, William Tarrant
core   +1 more source

Reservoir-forming by lateral supply of hydrocarbon: A new understanding of the formation of Ordovician gas reservoirs under gypsolyte in the Ordos Basin

Natural Gas Industry B, 2014
There developed thick gypsum-salt strata in the Lower Paleozoic Ordovician in the Ordos Basin, particularly gypsum-salt in the 6th segment of the 5th member of Majiagou Fm (O1m56) in a wide distribution, serving as a good regional cap.
Yang Hua, Bao Hongping, Ma Zhanrong
doaj   +1 more source

Scotland : Hebridean Terrane [PDF]

, 2011
The Cambrian succession in the Hebridean Terrane extends for about 200 km from near Durness on the northern coast of the Scottish mainland SSW to Skye (Fig. 14). The classic account of the whole region is the memoir by Peach et al.
Molyneux, S.G., Rushton, A.W.A.
core  

Earliest Triassic microbialites in the South China Block and other areas; controls on their growth and distribution [PDF]

, 2007
Earliest Triassic microbialites (ETMs) and inorganic carbonate crystal fans formed after the end-Permian mass extinction (ca. 251.4 Ma) within the basal Triassic Hindeodus parvus conodont zone.
A Baud, A Baud, A Sandler, AD Woods, Alan Reynolds, AME Winguth, B Beauchamp, C Armella, CB Foster, D Chen, DH Erwin, DJ Lehrmann, DJ Lehrmann, DL Kidder, DL Lehrmann, E Garzanti, E Heydari, ES Krull, G Ryskin, H Sano, H Yang, J Haas, J Payne, J Tong, JJ Dravis, JJ Sepkoski Jr, JK Schubert, JM Kennard, JP Grotzinger, JT Kiehl, K Grice, K Grice, K Hips, K Kaiho, K Perch-Nielsen, L Krystyn, Li Guo, LR Kump, M Calner, MA Sephton, ME Brookfield, ML Fraiser, MR Saltzman, MT Whalen, N Sheldon, O Weidlich, P Sheehan, PB Wignall, PB Wignall, Pierre-Yves Collin, Qinglai Feng, R Riding, R Riding, R Riding, RA Berner, RF Dill, RJ Twitchett, RJ Twitchett, RK Goldhammer, RM Hotinski, S Crasquin-Soleau, S Crasquin-Soleau, S Kempe, S Kershaw, S Kershaw, S Kershaw, S Wang, SB Pruss, SH Bottrell, Steve Kershaw, Sylvie Crasquin-Soleau, W Wang, Xinan Mu, Y Ezaki, Y Isozaki, Y Kakuwa, Y Wang, Yue Li   +77 more
core   +2 more sources