1-20 OF 22 RESULTS FOR

Mechums River Formation

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 September 1974
Journal of Sedimentary Research (1974) 44 (3): 862–875.
...Frederic L. Schwab Abstract The Mechum River Formation is a thick succession of metamorphosed conglomerate, sandstone, siltstone, and shale exposed within a narrow, elongate structural infold (the Batesville syncline) along the axis of the Blue Ridge anticlinorium in central Virginia. The thickness...
Journal Article
Journal: Geology
Published: 01 July 1998
Geology (1998) 26 (7): 623–626.
...Christopher M. Bailey; Shanan E. Peters Abstract The late Neoproterozoic (ca. 700–730 Ma) Mechum River Formation is exposed as a structural inlier within Grenvillian basement in the Blue Ridge province of central Virginia, United States. The southern portion of the Mechum River belt preserves...
Journal Article
Journal: Geology
Published: 01 January 1996
Geology (1996) 24 (1): 59–62.
...Richard P. Tollo; Frederick E. Hutson Abstract Discovery of compositionally distinctive rhyolites produced from a peralkaline volcanic center within the late Neoproterozoic Robertson River batholith and which are intercalated with terrestrial deposits of the previously undated Mechum River...
Series: GSA Special Papers
Published: 01 January 1984
DOI: 10.1130/SPE194-p161
... Granitic rocks of the Robertson River Pluton intrude Precambrian Y gneisses in the core of the Catoctin-Blue Ridge Anticlinorium in northern Virginia. Cobbles and boulders of lithologically similar granite are present in the overlying Mechum River and Fauquier (Lynchburg) formations. Dikes...
Series: Geological Society, London, Memoirs, Geological Society, London, Memoirs
Published: 01 January 2011
DOI: 10.1144/M36.7
EISBN: 9781862394117
.... In the present compilation, however, we distinguish the Grandfather Mountain and Konnarock formations from the Mechum River succession, based on slightly different ages as reviewed above. For the former units, we apply a new palaeomagnetic pole from the Kwagunt Formation in the Grand Canyon ( Weil et al. 2004...
FIGURES
Series: GSA Field Guide
Published: 01 January 2017
DOI: 10.1130/2017.0047(01)
EISBN: 9780813756479
... and metavolcanic rocks of the Mechum River Formation and Lynchburg Group (along the lower hills in front of the Catoctin ridges on the horizon) and Mesoproterozoic basement (beneath the Ragged Mountains to the southeast and in the valley below) comprise the lowlands. The 1- to 3-km-wide Rockfish Valley high-strain...
FIGURES | View All (36)
Journal Article
Journal: GSA Bulletin
Published: 01 January 2014
GSA Bulletin (2014) 126 (1-2): 201–218.
.... Braided rivers are most commonly cited as the depositional environment, although Simpson and Ericksson (1989) interpreted pebble- to cobble- conglomerates as interbedded alluvial fan deposits. Basalt flows are associated with the fluvial deposits in the Unicoi Formation ( King and Ferguson, 1960...
FIGURES | View All (16)
Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(06)
EISBN: 9780813756400
...-isostatic adjustments, active tectonics in an intraplate setting, river incision, periglacial processes, and soil-saprolite formation. This field trip explores a geologic and geomorphic transect of the mid-Atlantic margin, starting in the Blue Ridge of Virginia and proceeding to the east across...
FIGURES | View All (44)
Journal Article
Published: 01 March 2014
Russ. Geol. Geophys. (2014) 55 (3): 299–322.
... history of the region. The first stage is marked by the formation of the ~ 970 Ma low-pressure zoned And–Sil rocks (P = 3.9-5.1 kbar, T = 510–640 °C) of the Teya aureole and a high metamorphic field gradient with dT/dH = 25–35 °C/km typical of many orogenic belts. At the second stage, these rocks...
FIGURES | View All (9)
Published: 06 October 2006
DOI: 10.1130/2006.fld008(07)
EISBN: 9780813756080
... ). An assemblage of clastic metasedimentary rocks uncon-formably overlies both Mesoproterozoic basement units and Neoproterozoic granitoids. From east to west, these include the Lynchburg Group/Fauquier Formation, Mechum River Formation, and Swift Run Formation (Figs. 2 and 3 ). These units are dominated...
FIGURES | View All (8)
Series: GSA Field Guide
Published: 01 January 2017
DOI: 10.1130/2017.0047(02)
EISBN: 9780813756479
... to Cyrogenian) cover rocks unconformably overlie the basement complex on both the western and eastern limbs of the Blue Ridge anticlinorium (Figs. 1 , 2 , and 3 ), and also crop out in a narrow belt in the central part of the anticlinorium (Mechum River belt). The Catoctin Formation is a marker unit...
FIGURES | View All (10)
Journal Article
Journal: Geology
Published: 01 October 2000
Geology (2000) 28 (10): 951–954.
.... References Aitken , J.D. , 1991 , Two Late Proterozoic glaciations, Mackenzie Mountains, northwestern Canada : Geology , v. v. 19 pp. 445 ߝ 448 . Bailey , C.M. , and Peters , S.E. , 1998 , Glacially influenced sedimentation in late Neoproterozoic Mechum River Formation, Blue...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1979
AAPG Bulletin (1979) 63 (12): 2164–2182.
... Minturn Formation, central Colorado 68 61 38 1 55 38 7 -- -- -- 60 22 18 Boggs, 1966 25. Precambrian Mechum River Formation, Virginia Blue Ridge 34 71 26 3 48 26 26 ~90 7 7 65 10 25 Schwab, 1974 II. MAGMATIC ARC PROVENANCES  C. Undissected Arc Provenance 26...
FIGURES | View All (5)
Journal Article
Published: 01 December 2003
Journal of the Geological Society (2003) 160 (6): 925–934.
... geochronology of the Robertson River Igneous Suite, Blue Ridge province, Virginia: evidence for multistage magmatism associated with an early episode of Laurentian rifting . American Journal of Science , 296 , 1045 – 1090 . Tollo , R.P. & Hutson , F.E. 1996 . 700 Ma age for the Mechum...
FIGURES | View All (7)
Journal Article
Published: 01 January 2009
Journal of the Geological Society (2009) 166 (1): 129–135.
... and sedimentation range from c . 700 Ma in the central Appalachians (e.g. Robertson RiverMechum River Formations; Tollo & Hutson 2007 ) to c . 600 Ma in mainland Scotland (Tayvallich Volcanic series; Dempster et al . 2002 ) and now, given the C-isotopic correlations, somewhat younger in the Shetland...
FIGURES
Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(02)
EISBN: 9780813756400
... (Lynchburg, Fauquier and Mechum River Formations) overlies the basement complex ( Wehr, 1985 ; Bailey et al., 2007b ) (Figs. 1 and 4A). This sequence includes both marine and non-marine arkoses, conglomerates, and wackes formed during an episode of continental rifting that created significant...
FIGURES | View All (14)
Series: GSA Field Guide
Published: 01 January 2010
DOI: 10.1130/2010.0016(05)
EISBN: 9780813756165
... to orthopyroxene-bearing granites. Figure 1. Generalized stratigraphic section of rock formations in the western Blue Ridge anticlinorium, Virginia. Based in part on figure 6 from Gathright (1976) . Zp—Neoproterozoic garnet-graphite paragneiss. The felsic 730–700 Ma Robertson River plutonic...
Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP326.2
EISBN: 9781862395749
... shown as within Mechum River Fm (diamictite). Pre-glacial, only one glacial event in Appalachians; assumed correlative with older Windermere (Rapitan=Sturtian). Error assumed Tollo & Hutson (1996) , p. 61, quoting a GSA abstract 705.00 5.00 U–Pb 38.90 −78.10 Robertson River igneous suite...
FIGURES | View All (15)
Journal Article
Published: 01 January 2002
American Mineralogist (2002) 87 (1): 115–131.
... extensional exhumation ( Hurlow et al. 1991 ). Following Mesozoic metamorphism and crustal shortening, strata within the Raft River, Albion, and Grouse Creek Mountains were attenuated by intralayer plastic flow and by excisement along low-angle faults and shear zones (see below) during regional extension...
FIGURES | View All (8)
Journal Article
Published: 01 August 2016
Russ. Geol. Geophys. (2016) 57 (8): 1204–1220.
... ( Berman, 1991 ; Berman and Aranovich, 1996 ) and THERMOCALC 3.2 ( Holland and Powell, 1998 ; Powell and Holland, 1994 ) for similar rock samples collected from localities at the Yenisei and Tis Rivers ( Likhanov et al., 2013 d, 2015 a). Table 1. Representative mineral analyses (wt...
FIGURES | View All (5)