DOCSLIB.ORG

Prepliocene Extension Around the Gulf of California and the Transfer of Baja California to the Pacific Plate

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Prepliocene Extension Around the Gulf of California and the Transfer of Baja California to the Pacific Plate CORE Metadata, citation and similar papers at core.ac.uk Provided by Caltech Authors TECTONICS,VOL. 8, NO. 1, PAGES99-115, FEBRUARY1989 PRE-PLIOCENE EXTENSION AROUND THE GULF OF CALIFORNIA AND THE TRANSFER OF BAJA CALIFORNIA TO THE PACIFIC PLATE J. M. Stockand K. V. Hodges Departmentof Earth, Atmospheric,and PlanetarySciences, MassachusettsInstitute of Technology,Cambridge Abstract. Late Miocene (12-5 Ma) extensionaround the Originally, the protogulfconcept was usedto explain an area edgesof the Gulf of Californiahas been alternatively attributed of anomalouslyold oceanic crust adjacentto the Mexican to "Basin and Range" extension, back arc extension, or margin at the mouth of the Gulf of California [Moore and developmentof the Pacific-NorthAmerica plate boundary. Buffington, 1968]. More recently, this concept has been This extensionwas ENE directedand similar in structuralstyle expandedto include late Miocene extensionalfaulting and to extensionin the Basin and Range province. Timing marine sedimentsfrom areas surroundingthe northern and constraints permit nearly synchronous onset of this centralparts of the Gulf of California [e.g., Karig and Jensky, deformationin a belt extendingSSE from northernmostBaja 1972; Moore, 1973; Gastil et al., 1979]. These late Miocene Californiato the mouthof the gulf. Where this extensional extensionalstructures and sedimentsare exposedaround the faulting continuedthrough Pliocene time to the present, gulf in the "Gulf ExtensionalProvince" [Gastil et al., 1975] synchronouswith motion on the modern transformplate on the east side of Baja California and the west coast of boundaryin the Gulf of California,no changein directionof mainland Mexico (Figure 1). The amountand direction of extension can be resolved. Revised constraints on Pacific- extensionof the pre-5.5 Ma protogulf, and its relation to North Americaplate motionsupport the developmentof this Pacific-North America motion, is not well known. late Miocene extensionas a componentof Pacific-North Several causes have been proposed for late Miocene Americadisplacement that couldnot be accommodatedby circumgulfextension. Karig andJensky [1972] suggestedthat strike-slipdisplacement along the existing plate boundary west it was back arc extension,but more preciseconstraints on the of the Baja Californiapeninsula. This scenarioimplies that timing of cessationof subductionwest of Baja California transferof BajaCalifornia from the North America plate to the [Mammerickxand Klitgord, 1982; Lonsdale,1989b] showthat Pacific plate was a gradualprocess, beginning about 12-10 it was not contemporaneouswith active subduction. The Ma, when motion of the Pacific plate relative to North geographiccontinuity, and similarityin extensiondirection, of Americawas partitioned into separateregimes of strike-slip the Gulf Extensional Province and the southern Basin and anddip-slip displacement on opposite sides of BajaCalifornia. Range extensionalprovince (in Arizona and Sonora)invited suggestionsthat this entire Miocene extensionalbelt resulted INTRODUCTION from the sameprocess of "Basinand Range extension" [Gastil, 1968;Dokka andMerriam, 1982;Curray and Moore, 1984]. In Openingof the Gulf of Californiais often attributedto two both of thesescenarios, late Miocene circumgulfextension is sequential extensional events: middle to late Miocene assumedto have beenoblique to Plioceneextension associated "protogulf"extension [Moore and Buffington, 1968; Karig and with the developmentof the Pacific-North America plate Jensky,1972; Moore, 1973]and the Pliocene development of boundary,and it is thoughtto have weakenedthe crust and the Pacific-NorthAmerica plate boundary, from about5.5 Ma hencefacilitated the propagationof the Pacific-NorthAmerica to the present[Larson et al., 1968;Curray and Moore, 1984]. plate boundary into the gulf. By contrast, Gastil and Krummenacher[1977] viewedpost-10 Ma extensionin Sonora as a continuous interval of "rhombochasmic extension", implicitly related to the developmentof the Pacific-North Copyright 1989 America plate boundary. Spencerand Normark [1979] and by the AmericanGeophysical Union. Hausback [1984] proposedthat late Miocene circumgulf extension accommodatedthe componentof Pacific-North Papernumber 88TC03753. Americadisplacement perpendicular to the preexistingstrike- 0278-7407/89/88TC-03753510.00 slip faults west of Baja California, after counterclockwise 100 Stockand Hodges: Pre-Pliocene Extension Around the Gulf of California / ! I O0 200 m, i ß 0 I00 200 km RIVERA PLATE I PACIFIC PLATE Fig. 1. Map of the Baja Californiapeninsula and adjacentmainland North America,showing the coastline,the southernBasin and Range province, and the Gulf ExtensionalProvince. The Tosco-Abreojosfault zone is located accordingto Spencerand Normark [ 1979];other borderland faults are generalized from Krause [ 1965]. Gulf plate boundaryfaults and limits of thecircumgulf extensional province (dark ticked lines) are generalized from references in the text. Bathymetriccontours (500 m, 2000 m) and basemap are from the North AmericanMap Committee [1965]. ENS is Ensenada. Stockand Hedges: Pre-Pliocene Extension Around the Gulf of California 101 rotationof the direction ofPacific-North America plate motion. Possibleexplanations forthe widespread Tertiaryextension in westernNorth America have been summarizedby Stewart [1978] and Christiansenand McKee [1978]. Some of these,as \$ YUM well as more recentexplanations, invoke mechanismsrelated '\ to the geometryand kinematicsof the Pacific-NorthAmerica • ß PHX plate boundary:extension within a broadzone of right-lateral shear [Atwater, 1970], extension above a "slab window" •lJ [Dickinsonand Snyder,1979], extensiondue to the geometric "'-.ME instability of triple junctions [Ingersoll, 1982], or extension ENS/'• , due to flexure above the Mendocino fracture zone [Glazner and X ß TUC Bartley, 1984]. Othersinvoke lithosphericor asthenospheric '\ causes unrelated to the development of the Pacific-North America plate boundary'extension due to relaxationof crust ß MD •-. thickened under compression [Molnar and Chen, 1983; c $ Wernicke et al., 1987] or extensiondue to steepeningof a formerly shallowly dipping subductedslab [Davis, 1980]. 400 k rn ----.,,-y , '" ' ' .,. Probably, Tertiary extensionin western North America had ß ,, Y f multiple causes. Observation of extension in areas ß .,.•?')' ? ) surroundingthe Gulf of California, where both "Basin and G '• Range"extension and Pliocene extension related to thePacific- ,, y y NorthAmerica plate boundary have occurred, may provide y someconstraints onpossible causallinks between extension _ and the developmentof the Pacific-NorthAmerica plate boundaryelsewhere. Thispaper examines (1) the differences instyle and direction betweenlate Miocene circumgulfextensional structures and " later structuresof the Pacific-NorthAmerica boundary zone in regionswhere Miocene to Recentdeformation has occurred, (2) the timing of late Miocene circumgulfextension and cessation of subduction,and (3) the direction and amount of Pacific- North America plate motion in Miocene time. Extensionand tectonic disruption in this area were much simpler than in -4 areasto the north, so the earlier shapeof the plate margincan = 4 bereconstructed andincorporated inthe analysis. 4 We suggest that late Miocene extension in the Gulf ExtensionalProvince wassimilar instyle tothat in the Basin m--• component of Pacific-North America plate boundary MAZ 4 anddisplacement.Rangeprovince This impliesbutmay that, have in latebeen Miocene kinematically time, plate a boundarydisplacement occurred both on the borderlandfaults - • 0 100 200 KM west of Baja Californiaand on extensionalfaults east of Baja California,isolating Baja Californiaas a rigid block within the Pacific-NorthAmerica plate boundary zone. 4 (• Geologictie point: -! distinctiveconglomerate LATE MIOCENE EXTENSION IN TI-• GULF TEP I {Gastil et al., 1981) EXTENSIONAL PROVINCE The Gulf Extensional Province [Gastil et al., 1975] encompassesthe easternedge of the Baja Californiapeninsula and the part of mainland Mexico bordering the Gulf of California, includingparts of the statesof Baja California, Fig. 2. Reconstructed width of the Gulf Extensional Baja California Sur, Sonora,Sinaloa, Nayarit, Jalisco,and Province,after closureof the gulf transformfaults by 300 km Durango(Figures 1 and 2). We draw the westernlimit of the (usingthe 5.5 Ma reconstructiondiscussed in the text). Base Gulf Extensional Province at the western limit of known map as in Figure 1. MD, MZ are Sonoran"metamorphic core continuousor pervasive Miocene or Pliocene normal faults complexes"[Anderson et al., 1980]. Other abbreviations:BC along the west side of the gulf, inferred from geologic is Bahia Concepci6n;ENS is Ensenada;LA is Los Angeles; summariesreferenced in the text. In the centralpart of the LOR is Loreto; LP is La Paz; MAZ is Mazatlfin; MEX is Baja California peninsula there is no evidence of Miocene Mexicali; P is Puertecitos;PHX is Phoenix;SB is San Borja; extension; Miocene extensional structureson the west side of SF is San Felipe; SJC is San Jos6del Cabo Trough; SR is thepeninsula and in thecontinental borderland therefore belong Santa Rosalfa; SRB is Santa Rosa Basin; TEP is Tepic, in to a separategeologic province. The westernlimit of the Gulf Nayarit; TIB is Isla Tibur6n; TIJ is Tijuana; TUC is Tucson; ExtensionalProvince (GEP) in the stateof Baja California VCH is Valle Chico; YUM is Yuma; 3V is Tres Vfrgenes; coincidesapproximately with the Main Gulf Escarpment,a 3M
Load more

Recommended publications
  • Cambridge University Press 978-1-108-44568-9 — Active Faults of the World Robert Yeats Index More Information
    Cambridge University Press 978-1-108-44568-9 — Active Faults of the World Robert Yeats Index More Information Index Abancay Deflection, 201, 204–206, 223 Allmendinger, R. W., 206 Abant, Turkey, earthquake of 1957 Ms 7.0, 286 allochthonous terranes, 26 Abdrakhmatov, K. Y., 381, 383 Alpine fault, New Zealand, 482, 486, 489–490, 493 Abercrombie, R. E., 461, 464 Alps, 245, 249 Abers, G. A., 475–477 Alquist-Priolo Act, California, 75 Abidin, H. Z., 464 Altay Range, 384–387 Abiz, Iran, fault, 318 Alteriis, G., 251 Acambay graben, Mexico, 182 Altiplano Plateau, 190, 191, 200, 204, 205, 222 Acambay, Mexico, earthquake of 1912 Ms 6.7, 181 Altunel, E., 305, 322 Accra, Ghana, earthquake of 1939 M 6.4, 235 Altyn Tagh fault, 336, 355, 358, 360, 362, 364–366, accreted terrane, 3 378 Acocella, V., 234 Alvarado, P., 210, 214 active fault front, 408 Álvarez-Marrón, J. M., 219 Adamek, S., 170 Amaziahu, Dead Sea, fault, 297 Adams, J., 52, 66, 71–73, 87, 494 Ambraseys, N. N., 226, 229–231, 234, 259, 264, 275, Adria, 249, 250 277, 286, 288–290, 292, 296, 300, 301, 311, 321, Afar Triangle and triple junction, 226, 227, 231–233, 328, 334, 339, 341, 352, 353 237 Ammon, C. J., 464 Afghan (Helmand) block, 318 Amuri, New Zealand, earthquake of 1888 Mw 7–7.3, 486 Agadir, Morocco, earthquake of 1960 Ms 5.9, 243 Amurian Plate, 389, 399 Age of Enlightenment, 239 Anatolia Plate, 263, 268, 292, 293 Agua Blanca fault, Baja California, 107 Ancash, Peru, earthquake of 1946 M 6.3 to 6.9, 201 Aguilera, J., vii, 79, 138, 189 Ancón fault, Venezuela, 166 Airy, G.
    [Show full text]
  • Tectonic Influences on the Spatial and Temporal Evolution of the Walker Lane: an Incipient Transform Fault Along the Evolving Pacific – North American Plate Boundary
    Arizona Geological Society Digest 22 2008 Tectonic influences on the spatial and temporal evolution of the Walker Lane: An incipient transform fault along the evolving Pacific – North American plate boundary James E. Faulds and Christopher D. Henry Nevada Bureau of Mines and Geology, University of Nevada, Reno, Nevada, 89557, USA ABSTRACT Since ~30 Ma, western North America has been evolving from an Andean type mar- gin to a dextral transform boundary. Transform growth has been marked by retreat of magmatic arcs, gravitational collapse of orogenic highlands, and periodic inland steps of the San Andreas fault system. In the western Great Basin, a system of dextral faults, known as the Walker Lane (WL) in the north and eastern California shear zone (ECSZ) in the south, currently accommodates ~20% of the Pacific – North America dextral motion. In contrast to the continuous 1100-km-long San Andreas system, discontinuous dextral faults with relatively short lengths (<10-250 km) characterize the WL-ECSZ. Cumulative dextral displacement across the WL-ECSZ generally decreases northward from ≥60 km in southern and east-central California, to ~25 km in northwest Nevada, to negligible in northeast California. GPS geodetic strain rates average ~10 mm/yr across the WL-ECSZ in the western Great Basin but are much less in the eastern WL near Las Vegas (<2 mm/ yr) and along the northwest terminus in northeast California (~2.5 mm/yr). The spatial and temporal evolution of the WL-ECSZ is closely linked to major plate boundary events along the San Andreas fault system. For example, the early Miocene elimination of microplates along the southern California coast, southward steps in the Rivera triple junction at 19-16 Ma and 13 Ma, and an increase in relative plate motions ~12 Ma collectively induced the first major episode of deformation in the WL-ECSZ, which began ~13 Ma along the N60°W-trending Las Vegas Valley shear zone.
    [Show full text]
  • Borehole-Explosion and Air-Gun Data Acquired in the 2011 Salton Seismic Imaging Project (SSIP), Southern California: Description of the Survey
    Borehole-Explosion and Air-Gun Data Acquired in the 2011 Salton Seismic Imaging Project (SSIP), Southern California: Description of the Survey Open-File Report 2013–1172 U.S. Department of the Interior U.S. Geological Survey COVER: High-explosives magazine, used for the Salton Seismic Imaging Program, parked in secured, unused private rodeo ground in Imperial Valley, California. Photo by Gary Fuis. Borehole-Explosion and Air-Gun Data Acquired in the 2011 Salton Seismic Imaging Project (SSIP), Southern California: Description of the Survey By Elizabeth J. Rose, Gary S. Fuis, Joann M. Stock, John A. Hole, Annie M. Kell, Graham Kent, Neal W. Driscoll, Sam Crum, Mark Goldman, Angela M. Reusch, Liang Han, Robert R. Sickler, Rufus D. Catchings, Michael J. Rymer, Coyn J. Criley, Daniel S. Scheirer, Steven M. Skinner, Coye J. Slayday-Criley, Janice M. Murphy, Edward G. Jensen, Robert McClearn, Alex J. Ferguson, Lesley A. Butcher, Max A. Gardner, Iain Emmons, Caleb L. Loughran, Joseph R. Svitek, Patrick C. Bastien, Joseph A. Cotton, David S. Croker, Alistair J. Harding, Jeffrey M. Babcock, Steven H. Harder, and Carla M. Rosa Open-File Report 2013–1172 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior SALLY JEWELL, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2013 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit http://www.usgs.gov or call
    [Show full text]
  • The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico
    atmosphere Article The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico Enrique Morales-Acuña 1 , Carlos R. Torres 2,* , Francisco Delgadillo-Hinojosa 3 , Jean R. Linero-Cueto 4, Eduardo Santamaría-del-Ángel 5 and Rubén Castro 6 1 Postgrado en Oceanografía Costera, Facultad de Ciencias Marinas, Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California Carretera Tijuana-Ensenada, Zona Playitas, Ensenada 3917, Baja California, Mexico; [email protected] 2 Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Centro Nacional de Datos Oceanográficos, Carretera Tijuana-Ensenada, Zona Playitas, Ensenada 3917, Baja California, Mexico 3 Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California Carretera Tijuana-Ensenada, Zona Playitas, Ensenada 3917, Baja California, Mexico; [email protected] 4 Facultad de Ingeniería, Universidad del Magdalena, Carrera 32 No. 22-08, Santa Marta, Magdalena 470004, Colombia; [email protected] 5 Facultad de Ciencias Marinas, Universidad Autónoma de Baja California Carretera Tijuana-Ensenada, Zona Playitas, Ensenada 3917, Baja California, Mexico; [email protected] (E.S.-d.-Á.); [email protected] (R.C.) * Correspondence: [email protected] Received: 26 August 2019; Accepted: 17 September 2019; Published: 26 September 2019 Abstract: Despite their impacts on ecosystems, climate, and human health, atmospheric emissions of mineral dust from deserts have been scarcely studied. This work estimated dust emission flux (E) between 1979 and 2014 from two desert regions in the Baja California Peninsula (BCP) using a modified dust parameterization scheme. Subsequently, we evaluated the processes controlling the variability of E at intra- and interannual scales. During the period 1979–2014 peak E were generally recorded in summer (San Felipe) and spring (Vizcaino), and the lowest emissions occurred in autumn (San Felipe) and winter (Vizcaíno).
    [Show full text]
  • Geochemistry and Origin of Middle Miocene Volcanic Rocks from Santa Cruz and Anacapa Islands, Southern California Borderland Peter W
    Geochemistry and Origin of Middle Miocene Volcanic Rocks from Santa Cruz and Anacapa Islands, Southern California Borderland Peter W. Weigand Department of Geological Sciences California State University Northridge, CA 91330 Cenozoic volcanism that began in the eastern Abstract - Major-oxide and trace-element Mojave Desert about 30 m.y. ago and swept compositions of middle Miocene volcanic rocks irregularly west and north. This extensive from north Santa Cruz and Anacapa Islands are extrusive activity was related closely to complex very similar. In contrast, they are geochemically tectonic activity that included subduction of the distinct from the volcanic clasts from the Blanca Farallon plate whose subduction angle was Formation, of similar age but located south of steepening, and interaction of the Pacific and the Santa Cruz Island fault, which implies North American plates along a lengthening significant strike-slip movement on this fault. transform boundary; this activity additionally The island lavas are also compositionally involved rotation and possible northward distinct from the Conejo Volcanics located translation of crustal blocks. onshore in the Santa Monica Mountains. The The origin of the volcanic rocks in this area island lavas are part of a larger group of about has been variously ascribed to subduction of the 12 similar-aged volcanic suites from the Farallon plate (Weigand 1982; Crowe et al. California Borderland and onshore southern 1976; Higgins 1976), subduction of the Pacific- California that all belong to the calc-alkaline
    [Show full text]
  • 668 Tijuana Comprehensive Road Rehabilitation Project ENG
    Project Close-Out Report Project Name: Comprehensive Road Rehabilitation Project for Tijuana, Baja California Certified: July 24, 2009 Implemented: October 2008 to November 2010 Close Out Report Prepared: March, 2017 Project ID: 668 NADB PROJECT CLOSE-OUT REPORT Contents I. Project Description .....................................................................................................................................3 Project Objective ................................................................................................................................. 3 1.1 General Information.......................................................................................................................3 1.2 Project Development .....................................................................................................................4 1.3 Project Implementation .................................................................................................................4 1.4 Disbursements ...............................................................................................................................5 II. Evaluation of design and implementation .................................................................................................5 2.1 Project Certification Summary .......................................................................................................5 2.2 Project Results................................................................................................................................6
    [Show full text]
  • The Stability and Evolution of Triple Junctions
    THE STABILITY AND EVOLUTION OF TRIPLE JUNCTIONS Theodore G. Apotria B.S., The University of Connecticut, 1982 A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Master of Science at The University of Connecticut 1985 APPROVAL PAGE Master of Science Thesis THE STABILITY AND EVOLUTION OP TRIPLE JUNCTIONS Presented by- Theodore G. Apotria, B.S. Major Adviser Associate Adviser | Peter Dehlrnger Associate Adviser 7 Peter Geiser Associate Adviser Thomas Moran The University of Connecticut 1985 ii DEDICATION This thesis is dedicated to my parents, George and Cleo Apotria, and to my "brother and best friend, John. Their support was essential in completing this work. iii ACKNOWLEDGEMENTS There are several individuals whose assistance and support contributed to this thesis, and to whom I am indebted: I am especially thankful to Dr. Norman Gray, who, as my major adviser, contributed many hours of stimulating discussion and attention. As the thesis topic evolved, his assistance in the theoretical development, computer programming, and critical commentary on the manuscript, all proved invaluable. Dr. Peter Dehlinger, Dr. Peter Geiser, and Dr. Thomas Moran, contributed their time reviewing the text and provided useful perspectives. Dr. Randolph Steinen contributed useful comments on the preliminary research proposal. I am also grateful to the Dept, of Geology and Geophysics for providing financial support in the form of a Teaching Assistantship, and an Amoco sponsored Master's Fellowship in Geophysics. I also thank Dr. Anthony Philpotts for providing a Research Assistantship from K.S.F. grant if EAR8017059* - iv ABSTRACT Triple junction stability, as introduced by McKenzie and Morgan (1969)> assumes constant relative velocities and can only be defined instantaneously.
    [Show full text]
  • Designing and Establishing Conservation Areas in the Baja California-Southern California Border Region
    DRAFT • NOT FOR QUOTATION Designing and Establishing Conservation Areas in the Baja California-Southern California Border Region Michael D. White, Jerre Ann Stallcup, Katherine Comer, Miguel Angel Vargas, Jose Maria Beltran- Abaunza, Fernando Ochoa, and Scott Morrison ABSTRACT The border region of Baja California in Mexico and California in the United States is a biologically diverse and unique landscape that forms a portion of one of the world’s global biodiversity hotspots. While the natural resources of this border region are continuous and interconnected, land conservation practices on either side of the international boundary that bisects this area are quite different. These binational differences place certain natural resources, ecological processes, and wildlife movement patterns at risk of falling through the cracks of conservation efforts implemented in each country. Thus, effective conservation in this region requires binational cooperation with respect to conservation planning and implementation. This paper describes the differences in land conservation patterns and land conservation mechanisms between Baja California and Alta California (Southern California). The Las Californias Binational Conservation Initiative is discussed as a case study for binational cooperation in conservation planning. Diseñando y Estableciendo Áreas de Conservación en la Región Fronteriza Baja California-Sur de California Michael D. White, Jerre Ann Stallcup, Katherine Comer, Miguel Angel Vargas, Jose Maria Beltran- Abaunza, Fernando Ochoa, y Scott Morrison RESUMEN La región fronteriza de Baja California en México y California en los Estados Unidos es un paisaje único y biológicamente diverso que forma una porción de una de las zonas clave (hotspots) de biodiversidad global en el mundo. Mientras que los recursos naturales de esta región fronteriza son continuos e interconectados, las prácticas de conservación del suelo en ambos lados de la frontera internacional que divide en dos esta área son realmente diferentes.
    [Show full text]
  • Baja California, Mexico, and a Vegetation Map of Colonet Mesa Alan B
    Aliso: A Journal of Systematic and Evolutionary Botany Volume 29 | Issue 1 Article 4 2011 Plants of the Colonet Region, Baja California, Mexico, and a Vegetation Map of Colonet Mesa Alan B. Harper Terra Peninsular, Coronado, California Sula Vanderplank Rancho Santa Ana Botanic Garden, Claremont, California Mark Dodero Recon Environmental Inc., San Diego, California Sergio Mata Terra Peninsular, Coronado, California Jorge Ochoa Long Beach City College, Long Beach, California Follow this and additional works at: http://scholarship.claremont.edu/aliso Part of the Biodiversity Commons, Botany Commons, and the Ecology and Evolutionary Biology Commons Recommended Citation Harper, Alan B.; Vanderplank, Sula; Dodero, Mark; Mata, Sergio; and Ochoa, Jorge (2011) "Plants of the Colonet Region, Baja California, Mexico, and a Vegetation Map of Colonet Mesa," Aliso: A Journal of Systematic and Evolutionary Botany: Vol. 29: Iss. 1, Article 4. Available at: http://scholarship.claremont.edu/aliso/vol29/iss1/4 Aliso, 29(1), pp. 25–42 ’ 2011, Rancho Santa Ana Botanic Garden PLANTS OF THE COLONET REGION, BAJA CALIFORNIA, MEXICO, AND A VEGETATION MAPOF COLONET MESA ALAN B. HARPER,1 SULA VANDERPLANK,2 MARK DODERO,3 SERGIO MATA,1 AND JORGE OCHOA4 1Terra Peninsular, A.C., PMB 189003, Suite 88, Coronado, California 92178, USA ([email protected]); 2Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, California 91711, USA; 3Recon Environmental Inc., 1927 Fifth Avenue, San Diego, California 92101, USA; 4Long Beach City College, 1305 East Pacific Coast Highway, Long Beach, California 90806, USA ABSTRACT The Colonet region is located at the southern end of the California Floristic Province, in an area known to have the highest plant diversity in Baja California.
    [Show full text]
  • The Many Faces of Mexico by David J
    The Many Faces of Mexico by David J. Danelo David Danelo graduated from the U.S. Naval Academy and served seven years as an infantry officer in the Marine Corps. In 2004, then-Captain Danelo served near Fallujah with the First Marine Expeditionary Force as a convoy commander, intelligence officer and provisional executive officer for a rifle company. His first book, Blood Stripes: The Grunt’s View of the War in Iraq (Stackpole: 2006), was awarded the 2006 Silver Medal (Military History) by the Military Writers Society of America. His most recent book is The Border: Exploring the U.S.-Mexican Divide (2008). He is a Senior Fellow in FPRI’s Program on National Security. Abstract: This article will reexamine basic assumptions about the geopolitics and character of the United States-Mexico border, take a closer look at current events that have affected the drug war and, finally, discuss possible policy responses beyond those routinely voiced in the public domain. eptember 2010 was a special time in Mexico. Billboards from Chihuahua to Chiapas celebrated the ‘‘bicentenario,’’ or the bicentennial celebra- S tion of Mexico’s declaration of independence from Spain. The patriotic festivities culminated on September 15, when revelers crowded the plazas of Mexico’s cities, cheeks painted in the tricolor of green, white and red. Just before midnight, in accordance with Mexico’s annual custom, city leaders read Father Miguel Hidalgo’s 1810 proclamation against colonial tyranny, and the crowd affirmed its conclusion with thunderous cries of ‘‘Viva Me´xico!’’ The Grito de Dolores, as the commemorated event is called, felt like a cross between July 4th in Washington, D.C.
    [Show full text]
  • Mexico: State Law on Legitimation and Distinctions Between Children Born in and out of Wedlock
    Report for the Executive Office for Immigration Review LL Files Nos. 2017-014922 through 2017-014953 Mexico: State Law on Legitimation and Distinctions Between Children Born In and Out of Wedlock (Update) August 2017 The Law Library of Congress, Global Legal Research Center (202) 707-6462 (phone) • (866) 550-0442 (fax) • [email protected] • http://www.law.gov Contents Introduction .....................................................................................................................................1 Aguascalientes .................................................................................................................................2 Baja California .................................................................................................................................4 Baja California Sur ..........................................................................................................................6 Campeche .........................................................................................................................................8 Chiapas ...........................................................................................................................................10 Chihuahua ......................................................................................................................................12 Coahuila .........................................................................................................................................14 Colima ............................................................................................................................................15
    [Show full text]
  • California Brown Pelican Nesting on Isla Alcatraz, Sonora, Mexico Juan Pablo Galván, 3411 Rutgers St., Hyattsville, Maryland 20783; Jpgal- [email protected]
    NOTES CALIFORNIA BROWN PELICAN NESTING ON ISLA ALCATRAZ, SONORA, MEXICO JUAN PABLO GALVÁN, 3411 Rutgers St., Hyattsville, Maryland 20783; jpgal- [email protected] Numbers of the California Brown Pelican (Pelecanus occidentalis californicus) off southern California declined precipitously during the 1960s (Schreiber and Delong 1969, Gress and Anderson 1983). With the decline in dichlorodiphenyldichloroethane (DDT) in the marine food chain along with efforts to preserve key habitat, Brown Pelican populations in southern California have increased (Shields 2002). Although patterns of attendance at each colony vary greatly from year to year, breeding populations farther south along the west coast of Baja California and in the Gulf of California have remained fairly stable (Everett and Anderson 1991, D. W. Ander- son pers. comm.). In 2004 Brown Pelicans formed a small nesting colony on Isla Alcatraz, a small island located 1.4 km off the coastal town of Bahía de Kino Viejo in Sonora, México (28° 49' N, 111° 55' W). I monitored this colony throughout the 2006 breeding season to determine if it had expanded or declined in comparison to previous estimates of numbers of active nests. I also tried to determine the fledgling success of the colony by monitoring 40 focal nests from early in the season in Janu- ary to when nests were abandoned in May. Given its small size, short distance from a major human settlement, and high biodiversity, Isla Alcatraz should be considered an important site for research and conservation. Most previous research on Isla Alcatraz has been undertaken by Prescott College A.C. (PC), a biological field station in the nearby town of Kino Nuevo.
    [Show full text]