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Loyd Sandstone

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Journal Article
Published: 04 December 2019
Journal of Sedimentary Research (2019) 89 (12): 1181–1206.
...Peter P. Flaig; Stephen T. Hasiotis; Timothy J. Prather; Darrin Burton ABSTRACT The Campanian Loyd Sandstone Member of the Mancos Shale (Loyd) along the Rangely Anticline, Piceance Basin, Colorado, contains a series of multi-meter-thick, heterolithic, coarsening-upward successions (CUSs...
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Journal Article
Published: 01 July 2016
Journal of Sedimentary Research (2016) 86 (7): 763–785.
... valley fills, 3) tidally modified deltas, 4) delta front, and 5) open marine. The regional distribution and stacking of these environments were used to identify ten flooding surfaces and map nine genetic sequences: two in the Loyd Sandstone, four in the lower Sego Sandstone, and three in the upper Sego...
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Type section of the <b>Loyd</b> <b>Sandstone</b> Member of the Mancos Shale near Hamilton...
Published: 04 December 2019
Fig. 4.— Type section of the Loyd Sandstone Member of the Mancos Shale near Hamilton, Colorado. A) Photomosaic with interpreted bed architectures and corresponding measured section for the upper 8 m of the exposed Loyd type section. B) Hummocky cross-stratification at the Loyd type section
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Facies of the <b>Loyd</b> <b>Sandstone</b> Member of the Mancos Shale along the Rangely A...
Published: 04 December 2019
Table 1.— Facies of the Loyd Sandstone Member of the Mancos Shale along the Rangely Anticline, Rangely, Colorado.
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Facies associations of the <b>Loyd</b> <b>Sandstone</b> Member of the Mancos Shale along ...
Published: 04 December 2019
Table 2.— Facies associations of the Loyd Sandstone Member of the Mancos Shale along the Rangely Anticline, Rangely, Colorado.
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Trace fossils found in the <b>Loyd</b> <b>Sandstone</b> Member of the Mancos Shale along ...
Published: 04 December 2019
Table 3.— Trace fossils found in the Loyd Sandstone Member of the Mancos Shale along the Rangely Anticline, Rangely, Colorado, including the dominant environmental interpretation for tracemakers.
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Outcrops of <b>Loyd</b> clinoforms.  A)  The <b>Loyd</b> sequence and overlying Sego Sand...
Published: 04 December 2019
Fig. 8.— Outcrops of Loyd clinoforms. A) The Loyd sequence and overlying Sego Sandstone Member of the Mancos Shale (Sego) sequences along the “Thirsty Draw” outcrop belt, including the location of Parts B–D. B) Clinoform geometries, including example of incision into FA-II along
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Evolutionary pathway of delta classes in the <b>Loyd</b> and Sego <b>sandstones</b> (modi...
Published: 01 July 2016
Fig. 15.— Evolutionary pathway of delta classes in the Loyd and Sego sandstones (modified from Galloway 1975 ; Coleman and Wright 1975 ; Bhattacharya and Walker 1992 ). Strong sediment supply led to more river influence in the L1, L2, and S1 sequences. Active local faulting and sea-level fall
Journal Article
Published: 01 June 2003
Scottish Journal of Geology (2003) 39 (1): 17–28.
... in the Moffat Shale Group (Birkhill Shale Formation) at the western end of the Ettrick Valley and at Dob’s Linn, and is also known from a mudstone interbed in turbidite sandstones to the north of the Megget Dam. Its associates include Torquigraptus magnificus (Přibyl & Münch), recorded for the first time...
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Outcrop example of the <b>Loyd</b> L2 sequence (see  Fig. 1 ) along the Rangely An...
Published: 04 December 2019
Fig. 6.— Outcrop example of the Loyd L2 sequence (see Fig. 1 ) along the Rangely Anticline. A) The Loyd L2 sequence and overlying Sego Sandstone Member of the Mancos Shale sequences at “the Bowl” outcrop belt including the location of Part B. B) Typical facies association stacking patterns
Journal Article
Journal: AAPG Bulletin
Published: 01 October 2005
AAPG Bulletin (2005) 89 (10): 1397–1427.
...-rich shale interbeds also exist in the Upper Ordovician sandstone-dominated unit. The gamma-ray cutoff line represents 150° API in wells with a shale baseline of 90–100° API, with the line recalibrated for wells with different shale baselines. The scale for total organic carbon data is at the base...
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Journal Article
Published: 01 January 2002
Geological Magazine (2002) 139 (1): 89–96.
... Silurian rocks exposed at Buttington, and its unconformable contact with Ordovician strata is exposed in two small roadside quarries (Fig. 1 ). The lower part of the Cefn Formation was considered to be lower Aeronian Stage by Ziegler, Cocks & McKerrow (1968, p. 766, fig. 2 ) and sandstones assigned...
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Journal Article
Published: 01 March 2007
Geological Magazine (2007) 144 (2): 225–234.
...; Brett, 1988 , p. 242), interbedded in its lower part with thin beds of laminated, fine-grained calcareous sandstone ( Lin & Brett, 1988 , p. 250) and two bentonites (geochemical analyses of these appear in an unpublished 2001 University of Wales, Aberystwyth Ph.D. thesis by J. Thorogood entitled...
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Journal Article
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 April 2003
GeoArabia (2003) 8 (2): 299–308.
...., in prep.). Blue frame marks Libyan area enlarged in Figure 3 . Figure 2: Total gamma-ray log of well E1-NC174. Latest Ordovician-early Silurian Tanezzuft Shale Formation with the basal radioactive, organic-rich ‘hot’ shale, overlying Ordovician sandstones of the Memouni at Formation (modified...
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Journal Article
Published: 28 November 2008
Geological Magazine (2009) 146 (2): 187–198.
... within the Central Iberian Zone of the Iberian Massif (see Robardet & Gutiérrez-Marco, 2002 , fig. 5.1, locality 22). Black, graptolitic Telychian–Homerian strata of the Guadarranquejo Formation overlie the pale quartzose sandstones of the Criadero Quartzite. Exposure is excellent (individual beds...
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Net-<b>sandstone</b>-thickness maps for fourth-order sequences  A)  L1 and  B)  L2...
Published: 01 July 2016
Fig. 10.— Net-sandstone-thickness maps for fourth-order sequences A) L1 and B) L2 of the Loyd Sandstone. Fault segments of the Douglas Creek Fault Zone, simplified from Bader (2009) , are shown as thin lines on the map.
Journal Article
Journal: AAPG Bulletin
Published: 15 October 2019
AAPG Bulletin (2019) 103 (10): 2447–2485.
... spectrometry, x-ray diffraction, x-ray fluorescence, electron probe microanalysis, quantitative evaluation of minerals by scanning electron microscopy, fluid inclusion analysis, and carbon and oxygen stable isotope analyses. The sandstones are compositionally immature with relatively high amounts of volcanic...
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Journal Article
Journal: AAPG Bulletin
Published: 01 June 2017
AAPG Bulletin (2017) 101 (6): 829–862.
...Jin Lai; Guiwen Wang; Yu Chai; Yi Xin; Qingkuan Wu; Xiaotao Zhang; Yanhui Sun ABSTRACT The deep high-temperature, high-pressure Lower Cretaceous Bashijiqike sandstone (buried to depths as great as 6.5–7.1 km [21,325–23,293 ft]) is an important natural gas reservoir in Keshen gas field, Kuqa...
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Journal Article
Published: 07 August 2018
Journal of Sedimentary Research (2018) 88 (8): 873–897.
... to be applied to prediction of depositional process regimes in other, less intensively studied basins. Six gross depositional environments have been mapped for each timeslice: (1) alluvial to coastal-plain sandstones; (2) coastal-plain coals, mudstones, and sandstones; (3) shoreline sandstones; (4) marine...
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Well-log section (top) showing gamma-ray logs and interpreted sequence boun...
Published: 01 July 2016
Fig. 7.— Well-log section (top) showing gamma-ray logs and interpreted sequence bounding flooding surfaces (bold lines) and other minor bounding surfaces (see Fig. 1 for location). This section parallels the depositional dip of the Loyd Sandstone. Also illustrated are interpreted depositional