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Pleistocene convolutions in cobbles and siltstone

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Journal Article
Journal: GSA Bulletin
Published: 01 November 2011
GSA Bulletin (2011) 123 (11-12): 2352–2365.
.... 20.1–19.6 Ma and ca. 19.3–18.7 Ma were characterized by temperate margins, an increased abundance of gravelly facies and diatomaceous siltstone and a lack of meltwater plume deposits suggest a cooler and drier climate with polythermal conditions for the Miocene climatic optimum (ca. 17.6–15.4Ma...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1962
AAPG Bulletin (1962) 46 (4): 457–477.
..., groove casts, and load casts, and convolute bedding. Interstratal crumpling, pull-aparts, and distortion are locally prominent. In general, the sediments and structures resemble those found in turbidite sequences, but graded bedding is lacking. The orientation of fold axes in slumped beds, the areal...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2006
GSA Bulletin (2006) 118 (11-12): 1377–1397.
... facies are very thin (≤1 mm) convoluted laminae of siltstone to very fine-grained sandstone, thin beds of well-sorted very fine-grained ripple-laminated sandstone with detrital biotite, and thin beds of moderately well-sorted ripple cross-laminated sandstone. Thin sandstone beds are commonly associated...
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Journal Article
Published: 01 August 1977
Bulletin of Canadian Petroleum Geology (1977) 25 (4): 767–791.
...-forming sandstones. Also observed were convolute or contorted laminations in some of the finer-grained sandstones and sandy siltstones of the member. Load casts were noted at the base of some of the larger thick-bedded sandstones, especially those overlying carbonaceous siltstone and mudstone. Both...
Journal Article
Published: 01 October 2016
Journal of Sedimentary Research (2016) 86 (10): 1179–1207.
... and Ifisi areas. Individual FA2 units range from 0.5 to 5 m thick, and are typically massive or crudely stratified with weak normal grading. The intraformational clasts are dominantly volcanic siltstone rip-up clasts and pumice, ranging from subangular to rounded pebble- and cobble-size particles...
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Journal Article
Published: 01 May 2016
Journal of Sedimentary Research (2016) 86 (5): 564–586.
... and Churkin 1970 ; Eberlein et al 1983 ). On southern Prince of Wales Island ∼ 200 km to the south of the Karheen type section, a basal conglomerate (> 1 km thick) fines upward to a Siegenian (middle Early Devonian) sequence comprising sandstone, siltstone, and minor limestone. Mudstone and graptolite...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2012
GSA Bulletin (2012) 124 (7-8): 1262–1277.
... area, the Coastal Cordillera is largely formed by a basement made up of Paleozoic metamorphic rocks and minor Paleozoic and Mesozoic plutonic rocks ( Sernageomin, 1998 ) ( Fig. 1 ). Tertiary sedimentary and volcanic strata, as well as Pleistocene and Holocene unconsolidated marine and continental...
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Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0037(08)
EISBN: 9780813756370
... hole data and surface mapping using 3–D modeling of the talc orebody morphology suggests multiple superposed folding events occurred. Plastic deformation resulting from ductile flow of the carbonate host is indicated by flexures and convolutions in the talc-dolomite contacts. The interference patterns...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 October 2015
Lithosphere (2015) 7 (5): 541–562.
... ( Fig. 3 ; Tempelman-Kluit, 1984 , 2009 ): (1) the Casca member, a heterogeneous Carnian–Norian sequence of lithic sandstone, argillite, and conglomerate; (2) the Hancock member, a Norian–Rhaetian reefal limestone; and (3) the Mandanna member, a Rhaetian maroon lithic sandstone, siltstone, mudstone...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 2013
AAPG Bulletin (2013) 97 (11): 1967–1995.
... the Lake Idaho depositional system that covered more than 26,000 km 2 (10,030 mi 2 ). During the Miocene to middle Pleistocene, the Snake River system was dammed along the western margin of the plain by lava flows, faulting, or both, forming a fluvial–lacustrine system in which the Idaho Group accumulated...
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Series: AAPG Studies in Geology, AAPG Studies in Geology
Published: 01 January 2012
DOI: 10.1306/13271353St613440
EISBN: 9781629810225
... the western South American plate, which caused the uplifting of the Serrania de Perija, Macizo de Santander, and Venezuelan Andes during Eocene-Pleistocene time, creating the present configuration ( Parnaud et al., 1995 ). Figure 2. Chronostratigraphic chart of southeast of Trujillo state and northwest...
Journal Article
Published: 28 May 2014
Journal of the Geological Society (2014) 171 (4): 525–538.
... and 3a ). Clast lithologies include massive and laminated dolostone (Crystal Spring Formation and Beck Spring Dolomite), schist, leucogranite, siltstone (basal Kingston Peak), quartzite, and chloritized diabase. Striated clasts ( Fig. 3b ) are common. The snowball Earth hypothesis ( Hoffman et al...
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Series: GSA Field Guide
Published: 01 January 2010
DOI: 10.1130/2010.0018(03)
EISBN: 9780813756189
.... Relatively minor angular unconformities have been documented or suspected in a few areas, but they do not appear to be widespread. Persistent, thick carbonaceous siltstones (probably floodplain and lacustrine) and locally thick coal beds in the Coalmont Formation indicate only minor intrabasin tilting...
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Series: Geological Society Memoirs
Published: 08 May 2019
DOI: 10.1144/M49.15
... variably contain analcime, quartz and heulandite, together with occasional pale albite-rich beds and pale calcitized ash layers, based on XRD analysis ( Jeans et al. 2003 ). The poorly exposed lower part of the succession (Potiki Siltstone: Fig. 13.9 ), dated as late Early Triassic Olenekian–Middle...
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Journal Article
Published: 14 January 2020
Journal of Sedimentary Research (2020) 90 (1): 1–26.
... pediment defining a paleo–land surface, locally overlying a weathering profile of probable late Neogene age. This surface is dissected by erosion of presumed Pleistocene age, generating extensive fresh exposures on the steeper valley sides but with rather poorer exposure on the gentler slopes. The rocks...
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