Poway Formation

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Journal Article
Published: 01 July 1972
Journal of Foraminiferal Research (1972) 2 (3): 137–144.
...P. Lewis Steineck; James M. Gibson; Ronald W. Morin Abstract Planktonic foraminifera indicate middle Eocene age, paleoecology; benthonic foraminifera indicate temperate water; Rose Canyon Formation deposited in outer shelf, upper bathyal environment; Poway Formation deposited in inner shelf...
Journal Article
Journal: AAPG Bulletin
Published: 01 October 1982
AAPG Bulletin (1982) 66 (10): 1692–1693.
... containing Poway rhyolite-bearing conglomerate. In San Diego, the Mount Soledad Formation is composed of six sedimentary facies: (1) paralic (upper estuarine), (2) deltaic, (3) alluvial fan and fluvial channels, (4) submarine canyon head, (5) inner fan channel, and (6) slope. Poway rhyolite clasts are found...
Journal Article
Journal: GSA Bulletin
Published: 01 February 1958
GSA Bulletin (1958) 69 (2): 199–220.
...GEORGE J BELLEMIN; RICHARD MERRIAM Abstract The Poway Conglomerate is an Eocene formation, covers approximately 125 square miles in western San Diego County, California, ranges in thickness up to about 1000 feet, is nearly horizontal, and in most places lies unconformably on the Cretaceous...
Journal Article
Published: 02 July 2019
Geological Magazine (2020) 157 (2): 233–247.
...Udita Bansal; Santanu Banerjee; Kanchan Pande; Dhiren K. Ruidas Abstract A detailed investigation of a glauconite bed within the Late Cretaceous Bryozoan Limestone Formation of the Bagh Group in central India, as well as the study of existing records, reveals the existence of a ‘glauconitic sea...
FIGURES | View All (10)
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 April 2012
Lithosphere (2012) 4 (2): 150–159.
... to the formation of aborted rifts ( Biswas, 1987 ). On the other hand, the south-central Deccan volcanic province, encompassing the northern extension of the Dharwar craton, is strongly influenced by west-coast rifting, leading to the formation of rift shoulders in terms of the Western Ghats. The seismic-velocity...
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Journal Article
Journal: PALAIOS
Published: 15 October 2019
PALAIOS (2019) 34 (10): 458–467.
... in this study belong to the Upper Triassic Maleri Formation of Pranhita-Godavari valley, northern Telangana, India ( Fig. 1 ). The Maleri Formation consists of sandstones and red clays with lime pellet rocks. The lime-pellet nodules occur discontinuously within the red clays. Based on lithology and fauna...
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Journal Article
Journal: Economic Geology
Published: 01 November 2000
Economic Geology (2000) 95 (7): 1505–1525.
... of the Zawar mining district belong to the Upper Aravalli Group. This sequence consists of arkosic quartzite, graywacke-phyllite, carbonaceous phyllite, and dolomite, which have been grouped by Roy et al. (1988) into various formations. Dolomite of the Zawar Formation contains the Pb-Zn mineralization...
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Journal Article
Published: 10 June 2020
Geological Magazine (2021) 158 (2): 359–374.
... mafic source. Increasing concentrations of Zr, Hf and Nd isotopes and a gradual increase in mean T DM from the older to the younger formations indicate erosional unroofing at the source terrain. The increasing ( 87 Sr/ 86 Sr) t through time relates to increased weathering of the source rock...
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Journal Article
Journal: GSA Bulletin
Published: 18 June 2019
GSA Bulletin (2020) 132 (3-4): 588–607.
... compound lava flow types dominating a particular formation tend to discount lateral changes in the volcanological characters of the lava flows leading to confusing identifications. • The normal-reverse-normal (N-R-N) or normal-reverse (N-R) and other paleomagnetic sequences in different parts may...
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Journal Article
Published: 07 January 2020
Geological Magazine (2020) 157 (2): 340–350.
... where the velocity of the overriding plate supersedes that of the subducting slab (Russo & Silver, 1996 ; Silver et al. 1998 ; Schellart, 2008 ). Advancing orogens are characterized by crustal thickening, an extensive reworking of the pre-existing crust and the formation of fold and thrust belts...
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Journal Article
Journal: PALAIOS
Published: 15 May 2018
PALAIOS (2018) 33 (5): 218–227.
... of years. Two amber samples ( Fig. 1 ) and a modern resin sample were analyzed in the present study. The ambers were embedded in shale mudstone beds of the Kimin Formation of the Siwalik Group of rocks (see Online Supplemental file figures). These beds also yield well-preserved angiosperm leaf...
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Journal Article
Published: 22 January 2019
Geological Magazine (2019) 156 (10): 1668–1690.
FIGURES | View All (13)
Series: GSA Reviews in Engineering Geology
Published: 01 January 2002
DOI: 10.1130/REG15-p379
EISBN: 9780813758152
...) . In Split Mountain Gorge, Woodard (1963 , 1974 ) referred to the voluminous megabreccia as the lower fanglomerate member of the Split Mountain Formation. Robinson and Threet (1974) called it the lower breccia member and suggested it was deposited by a catastrophic sedimentary process probably involving...
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Journal Article
Published: 01 February 2007
Bulletin of the Seismological Society of America (2007) 97 (1B): 318–330.
... rocks and sedimentary formations of later eras ( Valdiya, 1973 ; Naqvi et al. , 1974 ). Due to its complex structure with numerous associated faults and fractures, peninsular India has been extensively studied for earthquake phenomena associated with intraplate activity ( Rao and Murty, 1970...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1971
AAPG Bulletin (1971) 55 (5): 709–722.
... were formerly included in the La Jolla Formation, which is here elevated to group status. The remaining part of the Eocene section in the group status Diego area, above the La Jolla Group, was formerly called the Poway Conglomerate and is here elevated to group status, and two new formations...
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Journal Article
Journal: GSA Bulletin
Published: 01 May 2016
GSA Bulletin (2016) 128 (5-6): 916–925.
..., and closely similar rocks are known from Archean and Proterozoic terrains and oceanic settings. The giant plagioclase basalts have usually been interpreted as end products of magmatic cycles operating in high-level chambers, and taken as the boundaries of stratigraphic formations. A new model is proposed...
Journal Article
Journal: GSA Bulletin
Published: 01 February 1971
GSA Bulletin (1971) 82 (2): 477–480.
... Eocene, respectively) of Mallory (1959). These provincial stages are used currently for both age assignment and interbasin correlation. Planktonic foraminifers in the Rose Canyon Shale, Poway Conglomerate, and the Matilija, Cozy Dell, Lodo, and Sacate Formations suggest that these formations, as a whole...
Journal Article
Journal: Economic Geology
Published: 01 May 2021
Economic Geology (2021) 116 (3): 559–579.
... zone. Based on several lines of evidence, the following paragenetic sequence is proposed for pyrite formation at Dona, Jonnagiri. Rapid crystallization of early (porous) pyrite-I was followed by its dissolution during ~E-W–trending Sh 1 shearing. Crystallization of main-stage pyrite-II and the late...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP445.13
EISBN: 9781786203281
... flows composed of weathered porphyritic and amygdaloidal basalt. This rheological contrast locally affected the emplacement of dykes, producing offset, the formation of sills, the curvature of dyke walls and finger-like intrusions. The offset of dykes is presumably caused by variations in local stress...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2430(36)
... Formation) separate the basalts and basement, but some Lameta sediments are known to have been derived from already erupted Deccan basalt flows in nearby areas. Thus, the eruption and flowage of the earliest Deccan basalt lava flows onto extensive flat planation surfaces developed on varied bedrock...