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Pickhandle Formation

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Journal Article
Journal: Geosphere
Published: 01 June 2008
Geosphere (2008) 4 (3): 459–479.
... most of the Calico Mountains, volcaniclastic sediments and dacitic rocks of the Pickhandle Formation accumulated rapidly between ca. 19.4 and 19 Ma. Overlying fine-grained lacustrine beds (here referred to as the Calico Member of the Barstow Formation) are bracketed between ca. 19 and 16.9 Ma...
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Journal Article
Journal: GSA Bulletin
Published: 01 April 1990
GSA Bulletin (1990) 102 (4): 459–477.
... is composed of a sequence of fluviatile and lacustrine sediments, and water-laid air-fall tuff beds; it is about 1,000 m thick, interfingers with the lower Miocene Pickhandle Formation, and is unconformably overlain by Pliocene basalt and Quaternary alluvium. The sediments have been folded into a syncline...
Journal Article
Journal: Economic Geology
Published: 01 December 1995
Economic Geology (1995) 90 (8): 2182–2196.
... (Palmetto complex) and its thin parautochthonous cover of Permo- Triassic marine clastic rocks (Diablo and Candelaria Formations) are structurally overlain, along the Pickhandle- Golconda thrust system, by ophiolitic tectonic melange forming the base of the Golconda allochthon. The total assemblage is cut...
Image
Figure 8. (A) Poles to measured bedding attitudes in the <b>Pickhandle</b> Formati...
in > Geosphere
Published: 01 June 2008
Figure 8. (A) Poles to measured bedding attitudes in the Pickhandle Formation. Beds generally dip 15–30°S to SE and are not folded. (B) Poles to bedding attitudes in the folded Calico Member north of the Calico fault. Figure only shows attitudes plotted in Plate 1 and does not include bedding
Journal Article
Journal: PALAIOS
Published: 01 June 2017
PALAIOS (2017) 32 (6): 396–412.
... belonging to the uppermost Pickhandle Formation. Sandstone beds are 25–35 cm thick, fine- to coarse-grained, and trough cross-stratified. Beds have incised bases and fine upwards from pebble lags to siltstone drapes with a few interbedded gravel lenses. On the south limb of the syncline, mushroom-shaped...
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Journal Article
Journal: PALAIOS
Published: 01 April 2001
PALAIOS (2001) 16 (2): 175–184.
... County, occurring in the Mud Hills (type section), Gravel Hills, Yermo Mountains, Alvord Mountains, and Black Canyon. The Barstow Formation interfingers with the underlying, pyroclastically dominated Pickhandle Formation, and is unconformably overlain by Pliocene basalts and Quaternary alluvium...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2005
GSA Bulletin (2005) 117 (3-4): 276–287.
... mostly of conglomerates, sandstones, and claystones with intercalated volcanic ashes and localized carbonates ( Dibblee, 1968 ; Woodburne et al., 1990 ). The Barstow Formation overlies and occasionally interfingers Tertiary breccias of the Pickhandle Formation ( Woodburne et al., 1990 ), called instead...
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Journal Article
Journal: PALAIOS
Published: 30 April 2020
PALAIOS (2020) 35 (4): 175–190.
... extension had ended in the central Mojave region and unconformably overlies the older Pickhandle and Mud Hills formations in the Mud Hills and Calico Mountains ( Fig. 1 ; Ingersoll et al. 1996 ; Glazner et al. 2002 ). The Barstow Formation is divided into three lithostratigraphic members in the Mud...
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Image
Figure 6. Fault data from the southern Calico Mountains. (A) Poles to all m...
in > Geosphere
Published: 01 June 2008
Figure 6. Fault data from the southern Calico Mountains. (A) Poles to all measured fault planes. Boxes—fault planes in the Pickhandle Formation. Triangles—fault planes along the Calico fault system. Solid circles—all other fault planes (mostly in dacite rocks of the Yermo volcanic center). (B
Image
Figure 13. Schematic reconstruction illustrating sequential stratigraphic a...
in > Geosphere
Published: 01 June 2008
and volcaniclastic sediments of the Pickhandle Formation accumulated rapidly in a basin formed by normal slip along a north-northeast–dipping proto-Calico fault. Extensional faulting within the Pickhandle Formation is minor. Beginning ca. 19 Ma, slip along the proto-Calico fault decreases or stops, and fine-grained
Image
Figure 12. Along strike variation in fold interlimb angle. Only interlimb a...
in > Geosphere
Published: 01 June 2008
orientations, there should be a progressive tightening of folds to the west (closer to the Calico fault). However, the tightest folds are located in a northeast-southwest– to east-west–trending belt between the dacite rocks and the Pickhandle Formation (Tp).
Journal Article
Published: 07 February 2005
Canadian Journal of Earth Sciences (2005) 42 (1): 49–66.
...Jason D. McClaughry; David R. Gaylord Abstract The middle Eocene White Lake and Skaha formations in the White Lake Basin, British Columbia record the sedimentary and volcanic infilling of a supradetachment basin that developed during the latter stages of Shuswap metamorphic core complex exhumation...
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Series: Guidebook
Published: 01 January 1996
DOI: 10.32375/1996-GB73.12
EISBN: 9781732014848
... is exemplified by the Pickhandle Formation, exposed in the Calico Hills, Mitchel Range, Mud Hills, Gravel Hills, Elephant Mountain, and the Lead Mountain area ( Fig. 4a ). Lithofacies are dominated by thick successions (>1000 m) of primary and epiclastic intermediate volcanic rock, pyroclastic deposits...
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Journal Article
Published: 01 August 1989
Journal of the Geological Society (1989) 146 (4): 721–724.
... the results of experiments to determine the behaviour of Pb-rich feldspars during dissolution, which demonstrate that clastic feldspars within sediments are a significant potential source for Pb. The role of diagenetic processes in ore formation was examined further by M. C. Akhurst (University of Newcastle...
Journal Article
Journal: Geosphere
Published: 01 December 2008
Geosphere (2008) 4 (6): 976–991.
...Charles E. Chapin Abstract Continental sedimentation reflects a complex interplay of tectonics and climate. A 2000-km transect from coastal California to the western Great Plains documents a major increase in sedimentation (ca. 16–6 Ma) coeval with deposition of the hemipelagic Monterey Formation...
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Journal Article
Journal: GSA Bulletin
Published: 01 November 2011
GSA Bulletin (2011) 123 (11-12): 2115–2141.
... caused back-tilting of the sedimentary strata, formation of half grabens with their own axial drainage systems, and development of angular unconformities. With the onset of this crustal-scale block faulting, the detachment fault ceased to operate, and the Quaternary Gediz graben started to develop...
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Series: GSA Field Guide
Published: 01 January 2008
DOI: 10.1130/2008.fld011(03)
EISBN: 9780813756110
... index contours shown as dark lines with elevations labeled. Early Miocene Pickhandle Formation here consists of consolidated conglomerate with poorly exposed bedding except for occasional, 2-25-m-thick lenses of monolithologic megabreccia. Mid- to late Miocene Barstow Formation consists of well-bedded...
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Journal Article
Published: 01 December 2000
Bulletin of the Seismological Society of America (2000) 90 (6B): S187–S208.
.... The most detailed available geologic maps are generally at 1:24,000 scale. Commonly, detailed geologic maps show aspects of bedrock geology, including subunits of major formations that are recognized by their distinctive lithology or mode of origin. These features, particularly lithology or grain size, may...
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