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gravel

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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/SP456.11
EISBN: 9781786203373
... in the Aegean Sea. Here, unusual seabed sediments, termed homogenites, were proposed as deposited from a tsunami generated by the Late Bronze Age eruption of Santorini ( Kastens & Cita 1981 ; Cita et al. 1984 ). In the Hawaiian Islands, boulders and coarse-grained gravels preserved at high elevations...
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Series: GSA Field Guide
Published: 01 January 2016
DOI: 10.1130/2016.0041(01)
EISBN: 9780813756417
..., U.S.A. The cataclysmic flooding produced huge coulees (dry river courses), cataracts, streamlined loess hills, rock basins, butte-and-basin scabland, potholes, inner channels, broad gravel deposits, and immense gravel bars. Giant current ripples (fluvial dunes) developed in the coarse gravel bedload...
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Series: GSA Reviews in Engineering Geology
Published: 01 January 2014
DOI: 10.1130/2014.4122(15)
EISBN: 9780813758220
... around the playas. Based on shoreline features such as barrier bars, wave-cut benches, and beach gravel deposits, the playas of Mud Lake, Gold Flat, and Kawich Lake contained pluvial lakes. Based on fossils, palustral clay sediments, paleospring, and seep deposits, the playas of Stonewall Flat, Indian...
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Series: GSA Special Papers
Published: 01 October 2012
DOI: 10.1130/2012.2490(04)
..., with large volume samples collected at narrow depth increments and laboratory analyses conducted. Results reveal, as predicted, that the soils contain small gravels (≤6 cm) scattered throughout the mound above a basal stone layer of large clasts (>6 cm). The stone layer is exposed across the intermound...
Series: GSA Special Papers
Published: 01 October 2012
DOI: 10.1130/2012.2490(06)
Series: GSA Special Papers
Published: 01 January 2011
DOI: 10.1130/2011.2473(10)
... seafloor varyingly composed of sand, gravel, silt, and clay. Side-scan sonar data are utilized to establish the spatial patterns of bedform types in the area. In addition, a benthic tripod, configured with an acoustic Doppler current profiler, a rotary fanbeam sonar, and a conductivity-temperature sensor...
Series: GSA Field Guide
Published: 01 January 2010
DOI: 10.1130/2010.0017(03)
EISBN: 9780813756172
... Abstract Riverbluff Cave developed near the southern margin of the Springfield Plateau as a single passage between James River and its tributary, Ward Branch. Portions of the cave preserve a general fining-upward sediment sequence, but with highly fossiliferous gravel beds near the middle...
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... ; and later reports) termed the “interlacustral fan gravel.” Meek (2000) reported a U-series age of ca. 80 ka on lacustrine tufa encrusting the uppermost clasts in this unit, which is overlain by lake sand and gravel. Wells, Brown, and Enzel ( Brown et al., 1990 ; Enzel et al., 1992 ; Wells and Enzel...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2432(11)
... gravels. Infrared stimulated luminescence (IRSL) dating on the lake beds yielded an age of 60.3 ∼5.6 ka BP, suggesting late OIS 4 ( oxygen isotope stage ) age for the lake. A subsequent phase of fluvial aggradation buried paleolake deposits under 65 m of glaciofluvial outwash. This was followed...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2006.2420(16)
... The sand and gravel within the Waipaoa River system of North Island, New Zealand, elucidate the provenance and sedimentary delivery system of an actively deforming continental forearc. In this region, Mesozoic to Cenozoic forearc basin sedimentary successions are being uplifted, eroded...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2425(13)
... Approximately 8000 lignite exploration cores, each 91 m (300 ft) deep, were used to map the gravel facies of the Upland Complex (Lafayette gravel) preserved on drainage divides in western Kentucky and Tennessee and on Crowley's Ridge in southeastern Missouri and eastern Arkansas. The Upland...
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2404(05)
... Rivers across unglaciated portions of the Appalachian Plateaus of Tennessee and Kentucky are deeply entrenched, almost without exception. Widespread gravel deposits on upland surfaces, combined with broad straths and terraces inset beneath the highlands indicate a history of base-level...
Journal Article
Journal: Geology
Published: 01 January 2002
Geology (2002) 30 (1): 63-66.
... postdepositional changes in slope can be determined. Miocene to earliest Pliocene gravels of the Ogallala Group (17.5–5 Ma) cap the tablelands, which currently tilt down to the east at slopes as great as 10 −2 . However, paleohydraulic analysis of the Ogallala gravels indicates depositional slopes of 10 −3 to 10...
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Journal Article
Journal: PALAIOS
Published: 01 April 2001
PALAIOS (2001) 16 (2): 185-191.
... of such bioclasts. This gravel-sized fraction of off-reef biogenic (bivalve) sediments showed variation in the extent of degradation, depending on whether it was found in an area bioturbated by callianassid or alpheid shrimps. Cores taken in the alpheid area have a higher proportion of grains with poorly defined...
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Journal Article
Published: 01 November 2000
Journal of the Geological Society (2000) 157 (6): 1169-1177.
...A. B. WATTS; W. S. MCKERROW; E. FIELDING Abstract The high level river gravels in Oxfordshire (the Northern Drift Group), which range in age from Early Pleistocene to around 450 ka, contain pebbles that were derived from a source area to the north near Birmingham. The pebbles could not have been...
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Journal Article
Published: 01 June 2000
Canadian Journal of Earth Sciences (2000) 37 (6): 863-877.
... and interglaciation in the northern Cordillera. Preglacial sedimentation is recorded in the Lower White Channel gravel that contains a reverse-normal polarity sequence. A re-aggradation of the nonglaciated valleys of the goldfields in response to Late Pliocene cooling is recorded by the Upper White Channel gravel...
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Journal Article
Published: 01 May 2000
Journal of the Geological Society (2000) 157 (3): 643-653.
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2000
GSA Bulletin (2000) 112 (1): 98-118.
... element analysis methodology emphasizes the description of lithofacies assemblages and their geometry as defined by bounding discontinuities. The architectural element analysis methodology has not, to date, been applied to glacial deposits with the exception of glaciofluvial sands and gravels ( Dawson...
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Journal Article
Published: 01 December 1999
Canadian Journal of Earth Sciences (1999) 36 (9): 1567-1581.
Journal Article
Journal: GSA Bulletin
Published: 01 September 1999
GSA Bulletin (1999) 111 (9): 1315-1334.
... record of the Cordilleran foreland suggests that these types of deposits may be the volumetrically largest gravel accumulations in nonmarine foreland basin systems. Geological Society of America 1999 ...