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Topic: Peninsular Ranges

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	EPA: Federal Register: Endangered and Threatened Wildlife and Plants; Endangered Status for the Peninsular Ranges ...
		The majority of the range of the Peninsular bighorn sheep is classified as Colorado Desert, a subarea of the Sonoran Desert.
		Peninsular bighorn sheep are susceptible to fragmentation due to the distribution of habitat (narrow band at low elevation), use of habitat (e.g., occupying low elevations), and population structure.
		Disease is a major factor responsible for the precipitous decline of Peninsular bighorn sheep in the northern Santa Rosa Mountains and appears to significantly contribute to population declines elsewhere throughout its range.
	www.epa.gov /fedrgstr/EPA-SPECIES/1998/March/Day-18/e6998.htm (15694 words)

	Refraction and other data: TRANSECT C3 -- PENINSULAR RANGES (Site not responding. Last check: 2007-11-07)
		Seismic constraints for the deep structure of the Peninsular Ranges are sparse.
		Their map indicates that the west half of the Peninsular Ranges has a higher average upper-crustal velocity and a lower average mantle velocity in comparison with the east half.
		As beneath the borderland, the mafic rocks beneath the Peninsular Ranges may have reached their current thickness by thrust imbrication, tectonic underplating, or magmatic underplating.
	www.johnmartin.com /earthquakes/eqsafs/safs_834.htm (501 words)

	Title
		Thus, it is reasonable to investigate the influence of the compositional boundary on Peninsular Ranges crustal thickness in response to Tertiary tectonic events such as Miocene extension and extension associated with the opening of the Gulf of California and the Salton trough.
		In the eastern portion of the Peninsular Ranges the time differential between the direct P and the largest converted phase steadily and dramatically decrease from 4.2 s at the compositional boundary to 3.1 s near the edge of the Salton trough (Fig.
		We hypothesize that the steep Moho slope under the eastern Peninsular Ranges batholith is due to the crustal thinning and rifting associated with the opening of the Gulf of California and the Salton trough.
	www.seismo.unr.edu /ftp/pub/ichinose/PENINSULAR/peninsular.html (3913 words)

	Peninsular Ranges (Site not responding. Last check: 2007-11-07)
		The Peninsular Ranges are a group of mountain ranges which stretch 1500 km (900 miles) from southern California in the United States to the southern tip of Mexico's Baja California peninsula; they are part of the North AmericaNorth American Coast Ranges that run along the Pacific OceanPacific coast from Alaska to Mexico.
		On the coast side of the ranges, the California chaparral and woodlands ecoregion covers the northern portion of the range, in southern California and northern Baja California.
		Anza-Borrego Desert State Park, on the eastern side of the Peninsular Ranges in San Diego County, is famous for its springtime profusion of Sonoran Desert wildflowers.
	www.infothis.com /find/Peninsular_Ranges (410 words)

	Recent SCEC Published Research
		This range of Moho depths within the Peninsula Ranges, as well as the sharp ~east-west gradient in depth in the eastern part of the range, are in agreement with the earlier observations from north of the international border.
		We suggest that Moho shallowing under the eastern Peninsular Ranges reflects extensional deformation of the lower crust in response to adjacent rifting of the Gulf Extensional Province that commenced in the late Cenozoic.
		Support of the eastern Peninsular Ranges topography may be achieved through a combination of flexural support and lateral density variations in the crust and/or upper mantle.
	www.scec.org /news/01news/center011218.html (2882 words)

	SDNHM: Geology of San Diego County
		San Diego County can be divided between three distinct geomorphic regions: the Coastal Plain region as exposed west of the Peninsular Ranges, the Peninsular Range region, and the Salton Trough region as exposed east of the Peninsular Ranges.
		This geomorphic division reflects a basic geologic difference between the three regions, with Mesozoic metavolcanic, metasedimentary, and plutonic rocks predominating in the Peninsular Ranges, and primarily Cenozoic sedimentary rocks predominating to the west and east of the central mountain range.
		The Peninsular Ranges Region is underlain primarily by plutonic (i.e., granitic) rocks that formed from the cooling of molten magmas deep within the earth's crust.
	www.sdnhm.org /research/paleontology/sdgeol.html (956 words)

	The Coachella Valley Multiple Species Habitat Conservation Plan (Site not responding. Last check: 2007-11-07)
		The Peninsular bighorn sheep is restricted to the east facing, lower elevation slopes (below 1400 meters) of the Peninsular Ranges in the Sonoran desert life zone.
		Range wide estimates of abundance for the U.S. population, from the San Jacinto Mountains to the Mexican border, began in the 1970's.
		The Peninsular bighorn sheep is endangered because of the loss and fragmentation of habitat, disease, and predation.
	www.cvmshcp.org /sp_01.htm (684 words)

	GEOCHEMISTRY OF THE SOUTHERN CALIFORNIA BATHOLITH: NEW DATA FOR THE NORTHERN PENINSULAR RANGES AND TRANSVERSE RANGES (Site not responding. Last check: 2007-11-07)
		Plutonic rocks within the Transverse Ranges are composed principally of quartz diorite, granodiorite and quartz monzonite with rarer gabbroic plutons in the Peninsular Ranges.
		This information is consistent with the premise that the western parts of the Peninsular Ranges plutons have a major component of subducted oceanic crust and do not involve significant continental crust anatexis.
		The Transverse Ranges remain enigmatic as they do not continue the geochemical trends of the Peninsular Ranges, northward.
	gsa.confex.com /gsa/2001ESP/finalprogram/abstract_2167.htm (409 words)

	Peninsular Ranges Reading List (Site not responding. Last check: 2007-11-07)
		Forearc-basin sedimentary response to rapid Late Cretaceous batholith emplacement in the Peninsular Ranges of southern and Baja California: Geology, v.
		Structural patterns of the Pacific floor offshore of peninsular California, in Dauphin, J.P., and Simoeit, B.R.T., eds., Gulf and Peninsular province of the Californias: American Association of Petroleum Geologists, Memoir 47, p.
		Metamorphic and tectonic evolution of the northern Peninsular Ranges batholith, southern California, in Ernst, W.G., ed., Metamorphism and crustal evolutionn of the western United States, Rubey Volume VII, Chapter 32, p.
	seis.natsci.csulb.edu /grannell/PeninsularRead.html (1366 words)

	Peninsular Ranges Batholith Rock Set (Site not responding. Last check: 2007-11-07)
		Laboratory exercises that utilize rock suites particular to specific modern geologic environments are an important approach in geoscience education that helps to overcome the fragmentary spatial/temporal perspective typically afforded by the geologic record.
		The goal of this student-based project is to establish a reference suite of rocks and teaching materials for the Peninsular Ranges batholith, a classic circum-Pacific continental margin batholith segment, which will be made available to other geology departments by purchase or trade.
		The PRB suite is based on a transect across the northern part of the batholith in the San Diego region where the structure, petrology, and geophysical characteristics of the batholith are particularly well-documented.
	www-rohan.sdsu.edu /~rocksets (257 words)

	CALIFORNIA (Site not responding. Last check: 2007-11-07)
		From east to west, westside California stretches from the crests of the Cascades, Sierra Nevada, Transverse Ranges, and Peninsular Ranges to the Pacific Ocean.
		The Cascades are not a continuous range in California but are variously elevated volcanic flows and cones punctuated by two impressive volcanic peaks, Mt. Shasta (4,305 meters) and Mt. Lassen (3,187 meters), which is still active.
		The Transverse and Peninsular ranges of southern California are not as high or as continuous as the northern California mountains, but there is still a clear dividing line between the coastal Mediterranean climate and the more rigorous interior continental climate.
	www.usarec.army.mil /6thBde/6jbn/Welcome/states/CALIFORNIA.htm (426 words)

	Publications
		(in prep.), Differential cooling histories across basement structures in the central Peninsular Ranges batholith: implications for exhumation in arcs experiencing synchronous deformation and intrusion.
		Wetmore, P.H., Schmidt, K.L., and Paterson, S.R. (2002), Tectonic implications for the along-strike variation in the character of the western zone of the Peninsular Ranges batholith, southern and Baja California: Geology, v.
		Integrated geological, geochemical and geochronological studies across a crustal-scale "suture" in the Peninsular Ranges batholith, Baja California, México.
	www.lcsc.edu /klschmidt/Publications.htm (1138 words)

	EPA: Federal Register: Endangered and Threatened Wildlife and Plants, Notice of Reopening of Comment Period on Proposed ...
		On May 8, 1992, the Service published a rule proposing endangered status for the Peninsular Ranges population of the desert bighorn sheep (57 FR 19837).
		Population dynamics of Peninsular bighorn sheep in the Santa Rosa Mountains, California.
		A morphometric reevaluation of the Peninsular bighorn subspecies.
	www.epa.gov /fedrgstr/EPA-SPECIES/1997/April/Day-07/e8779.htm (827 words)

	Research-PRb
		We argue that the proposed Guerrero Superterrane is composed of at least three distinct segments (Santiago Peak, Alisitos, and Guerrero) with a major Early Cretaceous oblique slip structure juxtaposing the Santiago Peak and Alisitos segments and infer that a similar structure must juxtapose the Alisitos with the Guerrero.
		The basement of the Santiago Peak Volcanics is composed of continentally derived turbidite sequences.
		These data sets indicate that the western part of the Peninsular Ranges is composed of at least two terranes that experienced distinct origins and tectonic evolutions (Wetmore and Paterson, 2003; Wetmore et al., 2004).
	www.geo.arizona.edu /~pwetmore/Page_2.html (957 words)

	Wetmore's Publications
		Wetmore, P.H., Schmidt, K.L., and Paterson, S.R., The tectonic implications for the along-strike variability in the character of Peninsular Ranges batholith of southern and Baja California : Geology, v.
		Wetmore, P.H., 2003, Investigation into the tectonic significance of along strike variations of the Peninsular Ranges batholith, southern and Baja California [unpublished PhD dissertation]: University of Southern California, Los Angeles, California, 199p.
		Wetmore, P.H., Paterson, S.R., Schmidt, K.L., and Herzig, C., 2002, Tectonic implications for along-strike variations in the character of the Mesozoic Peninsular Ranges batholith of southern and Baja California : Memorias de VI Reunión Internacional sobre Geología de la Penísula de Baja California : p.
	www.geo.arizona.edu /~pwetmore/Publications.htm (1065 words)

	1995 Fall AGU - Ichinose et al. (Site not responding. Last check: 2007-11-07)
		We investigate the crustal thickness and Moho topography underlying the Peninsular Ranges near the U.S.-Mexico border with an east-west array of 9 broadband stations spanning the Peninsular Ranges batholith to record P-to-S converted phases generated at the Moho by teleseismic body waves.
		The largest variations in differential travel times occur across the compositional boundary that separates the Peninsular Ranges Batholith into east and west zones by geochemical, petrological and geophysical properties.
		We propose that the compositional boundary separates 25 to 35 km thick crust in the eastern batholith from 35 to 41 km thick crust in the western batholith.
	www.seismo.unr.edu /ftp/pub/papers/95agu/95aguabs-ichinose.html (295 words)

	3-D Digital Elevation Models: Eastern Peninsular Ranges, California (Site not responding. Last check: 2007-11-07)
		Extension in the eastern Peninsular Ranges and Salton Trough
		In this image, the camera is located in Baja California, looking northwest towards the eastern Peninsular Ranges in Alta California.
		The Sierra de las Cucapahs, a region of late Cenozoic extensional faulting, is the isolated range in the foreground.
	pangea.stanford.edu /~davem/epr2.html (155 words)

	Summary of Citation
		Fossils in "Bedford Canyon" range from Triassic to Late Jurassic (Cliff Grey, personal communication).
		Part of unit is assigned a Middle Jurassic (Bajocian) age based on pelecypods collected near head of McBride Canyon, Santa Ana Mtns., CA.
		Publication: Schwarcz, H.P., 1969, Pre-Cretaceous sedimentation and metamorphism in the Winchester area, northern Peninsular Ranges, California: Geological Society of America Special Paper, 100, 63 p.
	ngmdb.usgs.gov /Geolex/Refsmry/sumry_4698.html (819 words)

	M183 (Site not responding. Last check: 2007-11-07)
		Peninsular bighorns occur in the Peninsular Ranges from the San Jacinto and Santa
		bighorns) occur in desert mountain ranges from White Mts.
		Winter range generally is smaller, but desert bighorns have smaller ranges in
	www.dfg.ca.gov /whdab/html/M183.html (658 words)

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