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Cascade Quartzite

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Journal Article
Journal: GSA Bulletin
Published: 01 June 1964
GSA Bulletin (1964) 75 (6): 549-562.
...ROBERT S YEATS Abstract At Mt. Baring, Gunn Peak, and Merchant Peak in the Cascade Range 40 miles east of Seattle, two klippen of hornblende-rich migmatitic rocks overlie a sequence of weakly metamorphosed argillites, quartzites, greenstones, and Permian marbles. The klippen are composed...
Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(33)
EISBN: 9780813756158
... of basalt plateau at altitude 2440– 2460 ft. This flat surface was flood swept, but higher hills ahead to S and mountains behind on left to NE were not. Road climbs onto a pre-basalt high—from basalt up onto old quartzite. The Miocene basalt flows buried a moderate-relief erosional landscape. No overlying...
FIGURES | View All (5)
Journal Article
Published: 01 December 2016
Rocky Mountain Geology (2016) 51 (2): 23-68.
..., at localities F (Cascade Creek) and Q (Canyon Creek), the Tamarron Member is overlain by the Spud Hill Member, but the Tamarron Member is overlain by the McCracken Member at locality O (Deadwood Creek Gulch). Figure 13A. Schematic of the stratigraphy at the top of the Ignacio Quartzite at various...
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Series: GSA Special Papers
Published: 01 July 2008
DOI: 10.1130/2008.442(01)
... recognized cyclomedusoid fossils in the Antelope Mountain Quartzite confirm that it is latest Neoproterozoic (Ediacaran) in age. Biogeographic affinities of the cyclomedusoid fossils suggest that the Yreka subterrane and its close associate, the Trinity subterrane, formed after the breakup of Rodinia...
FIGURES | View All (12)
Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0038(09)
EISBN: 9780813756387
... Abstract A ruling hypothesis for the central Cascade Range in Washington is that the Eocene arkosic formations, which are kilometers thick, were deposited in local grabens, such as the Chumstick Formation in the putative Chiwaukum graben. However, the formations are regional in extent...
FIGURES | View All (11)
Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(02)
EISBN: 9780813756158
... Structural Low. Although we emphasize mid-to-late Eocene stratigraphy and structure, we show that Neogene regional folds govern the map pattern of the Chiwaukum Structural Low and the surrounding crystalline basement. Thus, the central Cascade region has undergone alternating episodes of crustal shortening...
Series: GSA Field Guide
Published: 01 January 2007
DOI: 10.1130/2007.fld009(09)
EISBN: 9780813756097
... Table 5. MAJOR NORTHWESTERLY STRIKING FOLDS ON THE EASTERN FLANK OF THE CASCADE RANGE As a result of new 1:24,000 mapping, we test two popular beliefs about the regional geology of the eastern flank of the central Cascade Range. The first...
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Journal Article
Journal: Geosphere
Published: 01 June 2016
Geosphere (2016) 12 (3): 900-924.
... unit is dominated by amphibolite, siliceous schist, and quartzite (metachert), and contains widespread biotite schist and ultramafic rock, and minor marble and calc-silicate rock. It may correlate with low-grade Mississippian–Jurassic rocks northeast of the Cascades core (e.g., Monger, 1986 ; Miller...
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Journal Article
Published: 13 February 2018
Bulletin of the Seismological Society of America (2018) 108 (2): 761-780.
FIGURES | View All (12)