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Penas-Altas Formation

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Journal Article
Published: 01 January 2007
Journal of Paleontology (2007) 81 (1): 82–102.
... from the type area, “Navidad,” and is here designated as neotype of Voluta alta . The type locality is “Navidad” and is here confined to the intertidal platform at Punta Perro. Navidad Formation, Miocene, central Chile. SGO.PI.6276 (one juvenile specimen, PPN), SGO.PI.6277 (one spire, FRM...
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Journal Article
Journal: AAPG Bulletin
Published: 01 June 1981
AAPG Bulletin (1981) 65 (6): 1110–1134.
... and in the southern Perija area, those formations are partly replaced by the more clastic Penas Altas and Aguardiente Formations ( Fig. 2 ). Detailed field observations however, indicate the necessity for considering further subdivision ( Renz, 1977 ). Time-stratigraphically the Cogollo Group ranges from Aptian...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1961
AAPG Bulletin (1961) 45 (3): 390–391.
... of the Machiques and Uribante troughs. Renz ( op. cit .) proposes to exclude the well bedded basal sands of the Maracaibo platform. Except for the Río Negro exposure in Quebrada San Pedro, Renz uses the term Penas Altas which includes the Río Negro, Apón, and part of the Aguardiente formations. In this area...
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Journal Article
Journal: Geology
Published: 26 February 2019
Geology (2019) 47 (4): 359–362.
... Plateau to the west and the broken foreland of the Santa Bárbara System to the east. It is confined by the fault-bounded Sierra Alta to the west and the Tilcara ranges to the east. Air masses sourced in the Atlantic Ocean are forced to ascend and rain out along the eastern flanks of the Tilcara ranges...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 1958
AAPG Bulletin (1958) 42 (11): 2670–2691.
... with the more ancient schists. It is believed that the eruptive cycle of Permo-Triassic was related to the formation of deposits of tungsten (Josefina mine), of chalcopyrite (Salamanca and La Barrera mines). During the Jurassic and Cretaceous the region maintained its elevation, and was subjected...
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Journal Article
Published: 01 June 1975
Journal of the Geological Society (1975) 131 (3): 283–288.
... ammonite distributions and the opening of the South Atlantic 285 later date (approximately C. auritus subzone) is given by the strong similarities between faunas from the La Puya Member of the Penas Altas Formation in the Venezuelan Andes and contemporary deposits in West and South Africa and Madagascar...
Journal Article
Published: 31 July 2007
Canadian Journal of Earth Sciences (2007) 44 (7): 889–909.
... of Northwest North America . Lone Pine Publishing , Edmonton, Alta . Watson E. Luckman B.H. 2004 . Tree-ring-based mass-balance estimates for the past 300 years at Peyto Glacier, Alberta, Canada . Quaternary Research , 62 : 9 – 18 . Weed W.H. 1889 . Formation of travertine...
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Journal Article
Journal: Clay Minerals
Published: 01 June 2024
Clay Minerals (2024) 59 (2): 149–152.
... of the controlled formation of biominerals. She also studied the variation in shell morphology and problems associated with the compilation of data matrices for phylogenetic analysis and the preparation of electronic databases. Figure 3. Covadonga Brime with (from left) Sir Alwyn Williams (University...
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Journal Article
Published: 14 February 2018
Seismological Research Letters (2018) 89 (2A): 356–362.
... occupies the southern part of the basin. At the beginning, the VM was open to south, until ∼ 700 , 000    yrs ago, when volcanic activity blocked the drain of water, with the formation of Sierra Chichinautzin range ( Mooser and Montiel‐Rosado, 1989 ). The obstruction of the water outlet...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1944
AAPG Bulletin (1944) 28 (8): 1077–1195.
..., thin unit of shaly to thin-bedded limestone that in eastern Mexico has been called the Otates beds and in north-central Mexico has been included in the La Peña or Cuchillo formations. It ranges from 50 to 500 feet in thickness, averaging perhaps 100 feet, and has been identified at many places...
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Journal Article
Published: 01 January 2012
Journal of Sedimentary Research (2012) 82 (1): 37–52.
... or as a diagenetic precipitate during saline mudflat stages. The dry to ephemeral lake basins of the Monegros region in northern Spain are depressions of this type and provide a unique opportunity to examine whether and how conditions of gypsum formation are reflected by gypsum crystal morphology, yielding...
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Series: AAPG Memoir
Published: 01 January 2001
DOI: 10.1306/M75768C6
EISBN: 9781629810638
... Formation is volcanic-sedimentary and, with the Lower Cretaceous La Peña Azul Formation, suggests a highstanding source of varied clastic deposits along a well-defined segment that is interpreted to be a result of synsedimentary faulting during Late Jurassic to Barremian and even during the middle...
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Journal Article
Journal: AAPG Bulletin
Published: 01 December 1968
AAPG Bulletin (1968) 52 (12): 2324–2336.
.... Aguardiente sandstone bodies of the Barco area are correlative with the Lisure Formation in the Sierra de Perijá ( Fig. 3 ). On the south and east in Táchira, Merida, and Trujillo, the equivalent sandstones include sediments of early, middle, and late Albian ages. This sequence was called Peñas Altas by Renz...
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Journal Article
Published: 06 December 2023
Bulletin de la Société Géologique de France (2023) 194 (1): 15.
... and pollen grains are used to identify high and low oceanic levels, consistently with a recent paleobathymetric reconstruction based on foraminifera: the two lowest levels being successively marked by the deposit of a littoral calcarenite (the Calizza Tosca Formation) then by a subaerial erosive episode...
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Journal Article
Journal: Economic Geology
Published: 01 May 2019
Economic Geology (2019) 114 (3): 407–426.
... that prevailed during and since the formation of Josemaría. In the context of its geographic location, the Josemaría deposit displays several interesting geologic features, including its age, localized supergene enrichment, and limited time spanning deposit formation, exhumation, and subsequent burial beneath...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 23 May 2024
Lithosphere (2024) 2024 (2): lithosphere_2024_100.
... in thickness [ 36 , 37 ], unconformably overlies the Canaveilles and Jujols rocks [ 38 ]. In this succession Hartevelt [ 37 ] distinguished five formations, from bottom to top: the Rabassa Conglomerate, Cava, Estana, Ansobell, and Bar Quartzite formations ( Figure 3(a) ). The basal Upper-Ordovician alluvial...
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Journal Article
Published: 13 December 2019
Journal of the Geological Society (2020) 177 (2): 315–324.
... and Gustalapiedra formations has shed light on the nature of the Armorican Terrane Assemblage flora (through analysis of dispersed spores) and nearshore marine plankton (through analysis of the acritarch and prasinophyte phytoplankton and chitinozoan zooplankton) ( Askew & Wellman 2018 ; Askew 2019 ; Askew...
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Journal Article
Published: 06 June 2016
Geological Magazine (2016) 153 (5-6): 962–991.
... faults on the western flank and W-dipping faults on the eastern flank (see Fig. 4 ). Figure 10. (a) Oblique aerial photograph of the scarp of the Sierra Chica fault at the latitude of the city of Alta Gracia; view towards the SE. Note the curvature...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1989
AAPG Bulletin (1989) 73 (7): 887–903.
... late Miocene horizontal retro-arc basalts. Analysis of the evolving subduction zone located west of and beneath the study area shows that the formation of a subsequent volcanic gap in the magmatic arc and the development of extensive retro-arc basalts are related to the collision of a segment...
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Journal Article
Journal: Geophysics
Published: 05 June 2015
Geophysics (2015) 80 (4): B83–B94.
... in a series of limestone rocks of various dimensions ( 10 − 5 ÷ 5 × 10 − 4     m 3 ) divided into two different sedimentary facies (“dark” and “light” limestones) both belonging to the Aurisina Limestone Formation ( Cucchi and Piano, 2013 ). Also, three cores of the clayey...
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