Abstracts Presented at Professional Conferences

Nourse, J. A., and Premo, W. R., 2005, Proterozoic basement in the Pinacate region of northwest Sonora, Mexico: Possible connections to northeastern Australia?, Geological Society of America Abstracts with Programs, v. 37, n. 4, p. 57.      

Espinoza, M, Nourse, J. A., Premo, W. R., and Iriondo, A.,  2005, Stratigraphy, structure, and U-Pb geochronology of gneisses in Sierra Hornaday and Cerro El Aguila, northwest Sonora, Mexico: Fingerprints at the truncated margin of Laurentia, Geological Society of America Abstracts with Programs, v. 37, n. 4, p. 57.        

Jacobson, C. E., Barth, A. P., Grove, M., Nourse, Jonathan A., 2004, Detrital zircon geochronology indicates that Upper Cretaceous to Eocene sedimentary and metasedimentary rocks of southern California, Salinia, and the Sur-Obispo terrane are not far traveled, Geological Society of America Abstracts with Programs, v. 36, n. 5, p. ?.    

Nourse, Jonathan A., Premo, W. R., and Iriondo, Alexander 2003, Gneisses of the NW Sonora-SW Arizona border region: Two distinct Paleoproterozoic complexes at the southwest edge of Laurentia, Geological Society of America Abstracts with Programs, v. 35, n. 4, p. 67.    

Premo, W. R., Nourse, Jonathan A., and Iriondo, Alexander 2003, U-Pb zircon geochronology of Paleoproterozoic basement in northwestern Sonora, Mexico: Evidence for affinity to SW United States provinces, Geological Society of America Abstracts with Programs, v. 35, n. 4, p. 67.           

Oskin, M., Nourse, Jonathan A.,  and Iriondo, Alexander 2003, Geologic reconnaissance and geochronology of proto-Gulf of California extension, western Sonora, Geological Society of America Abstracts with Programs, v. 35, n. 4, p. 28.

Nourse, Jonathan A., 2002, Emplacement geometry, localized extension, and tectonic dismemberment of the Late Oligocene Telegraph Peak pluton, San Gabriel Mountains, California, Geological Society of America Abstracts with Programs, v. 34, n. 5, p. A-80.  

Nourse, Jonathan A., 2001, Mid-Miocene reconstruction of the east-central San Gabriel Mountains basement stratigraphy, Geological Society of America Abstracts with Programs, v. 33, n. 2, p. A-74.    

Silver, Leon T. and Nourse, Jonathan A., 2001, Comparison of timing of low-angle faulting in the Rand Mountains and southern Sierra Nevada relative to the classic Vincent thrust of the eastern San Gabriel Mountains, Geological Society of America Abstracts with Programs, v. 33, n. 2, p. A-74.

Nourse, Jonathan A., 2000, Reconnaissance geology of tilted Neogene strata in the Sonora-Arizona border region northwest of El Pinacate, Invited poster presentation for the MARGINS conference on rifting of continental lithosphere, Puerto Vallarta, Jalisco, Mexico, October 27-29.

Nourse, Jonathan A., Iriondo, A., Premo, W.R., Kunk, M.J., and Stahl, E.R., 2000, New constraints on the southwest margin of Laurentia from the Pinacate-Cabeza Prieta basement complex, Sonora and Arizona, Geological Society of America Abstracts with Programs, v. 32, n. 7, p. A318.

Nourse, Jonathan A., Stahl, E., Acosta, R., and Anderson, T. H., 2000, Reconnaissance geology and structure of Proterozoic and Mesozoic crystalline rocks northwest of El Pinacate, abstract in Calmus, T. and Perez-Sagura, E. (editors), Cuarta Reunion Sobre la Geologia del Noroeste de Mexico y Areas Adyacentes, p. 72-73.

Nourse, Jonathan A., 2000, Stahl, E., Curtis, D., Pratt, M., and Acosta, R.,  Stratigraphic position and deformational history of the Caborca-Altar stretched pebble conglomerate belt, abstract in Calmus, T. and Perez-Sagura, E. (editors), Cuarta Reunion Sobre la Geologia del Noroeste de Mexico y Areas Adyacentes, p. 73-74.

Nourse, Jonathan A. and Vathanasin, V., 1999, Geobotanical reasons for contrasting water budgets in two ocean-facing drainage basins, San Gabriel Mountains, CA, GSA Abstracts with Programs, v. 31, no. 7, p. A-413.

Demboski, J., Anderson, T. H., Stahl, E., and Nourse, Jonathan A., 1999, Field constraints on the trace of the Mojave-Sonora megashear in southwestern Arizona, GSA Abstracts with programs, v. 31, no. 7, p. A-115.

Nourse, Jonathan A., 1999, Early-mid Miocene brittle structures and dikes in the San Gabriel Mountains prepare the ground for San Gabriel fault displacement, GSA Abstracts with Programs, v. 31, no. 2, p. A-155.

Nourse, Jonathan A., Acosta, Ruben G., Stahl, Erin R., and Chuang, Mathew K., 1998, Basement geology of the 7.5 minute Mt. Baldy and Glendora quadrangles, San Gabriel Mountains, California, GSA Abstracts with Programs, v. 30, no. 5, p. 56.

Nourse, Jonathan A. and Litzenburg, Daniel M., 1998, Structural evidence for east-vergent shear in the upper plate of the Vincent thrust, San Gabriel Mountains, California, GSA Abstracts with programs, v. 30, no. 5, p. 57.

Acosta, Ruben G., Heise, Ryan C., and Nourse, Jonathan A., Syntectonic sedimentation within the San Jacinto fault zone as recorded by the eastern Borrego Badlands, California, GSA Abstracts with programs, v. 30, no. 5, p. 2.

Demboski, John A., Jr., Anderson, Thomas H., Nourse, Jonathan A., and Silver, Leon T., 1998, Caborca, San Gabriel, and Joshua Tree: Terranes at the southwestern margin of North America, GSA Abstracts with programs, v. 30, no. 7, p. A-355.

Nourse, Jonathan A., Stahl, Erin, R. Curtis, David J., and Pratt, Melissa L., 1996, Laramide contraction of a Late Jurassic transtensional basin at Sierra el Batamote, northwestern Sonora, GSA Abstracts with programs, v. 28, no. 7, p. A-114.

Nourse, Jonathan A., Pratt, Melissa L., and Reilly, John P., 1996, Dynamic interactions between surface discharge and groundwater flow in upper San Antonio watershed, San Gabriel Mountains, California, GSA Abstracts with programs, v. 28, no. 7, p. A-478.

Nourse, Jonathan A., 1996, Direction and timing of extension in metamorphic core complexes of Sonora, poster presentation at the Penrose conference on rifting of the Gulf of California, Loreto, Baja California Sur, April 18-22.

Nourse, Jonathan A., 1995, Pre-Miocene reconstruction of the upper plate of the Vincent thrust, San Gabriel Mountains, California, poster presentation at the Penrose conference on Mesozoic continental margin tectonics of southern and central California, Tehachapi, California, October 6-11.

Nourse, Jonathan A., 1995, Tectonic significance of foliated polymict conglomerate at Sierra el Batamote, northwestern Sonora, Mexico, presented at Caltech, Pasadena, California for the Leon T. Silver 70th birthday symposium, April 8-10.

Anderson, T.H., Mckee, J.W., Mckee, M.B., and Nourse, J.A., 1995, Coarse clastic deposits of Late Jurassic age in southwestern North America--a record of pullapart basins, GSA Abstracts with programs, v. 27, no. 6, p. A-75.

Nourse, Jonathan A., Reilly, John P., and Pratt, Melissa L., 1994, Pullapart basins along the San Antonio and San Gabriel fault zones, southern California, deduced from surface discharge variations, GSA Abstracts with programs, v. 26, no. 7, p. A-416.

Weigand, Peter W., Nourse, Jonathan A., and Hazelton, Garrett B., 1994, Geochemical comparison of Miocene intrusive rocks in the eastern San Gabriel Mountains and the middle Miocene Glendora Volcanics, GSA Abstracts with programs, v. 26, no. 7, p. A-293.

Nourse, Jonathan A., Hazelton, Garrett B., and Jones, Rogan K., 1994, Evidence for two phases of late Cenozoic sinistral slip on the San Antonio Canyon fault, eastern San Gabriel Mountains, California, GSA Abstracts with programs, v. 26, no. 2, p. 77-78.

Hazelton, Garrett B., and Nourse, Jonathan A., 1994, Miocene extension direction from dikes in the eastern San Gabriel Mountains, GSA Abstracts with programs, v. 26, no.2,p. 58.

Worthington, Matthew, and Nourse, Jonathan A., 1994, Hydrogeology of lower Aliso canyon, Chino Hills State Park, California , GSA Abstracts with programs, v. 26, no. 2, p. 105.

Hazelton, Garrett B. and Nourse, Jonathan A., 1993, Did the San Gabriel Mountains once floor the Los Angeles basin?: Evidence from a mid Cenozoic magmatic event, GSA Abstracts with programs, v. 25, no. 5, p. 50.

Nourse, Jonathan A., 1991, Upper plate tectonostratigraphy of the Vincent thrust, eastern and central San Gabriel mountains, California, GSA Abstracts with programs, v. 23.

Silver, Leon T. and Nourse, Jonathan A., 1991,Timing of the Rand thrust and its implication for Late Cretaceous tectonics in southern California, GSA Abstracts with programs, v. 23.

Nourse, Jonathan A., 1990, A thermal-gravitational driving mechanism for middle Tertiary extension in northern Sonora, Mexico, GSA Abstracts with programs, v. 22, no.3, p. 73.

Nourse, Jonathan A., 1990, Tectonostratigraphic and strain patterns in the Magdalena metamorpohic core complex, northern Sonora, Mexico , GSA Abstracts with programs, v. 22, no. 3, p. 73.

Nourse, Jonathan A., 1989, Quantification of two distinct ductile strain events in the lower plate of a metamorphic core complex, GSA Abstracts with programs, v. 21, no. 5, p. 124.

Nourse, Jonathan A., 1988, Tectonostratigraphic evolution of the Magdalena metamorphic core complex, north-central Sonora, Mexico, GSA Abstracts with programs, v. 20, no. 7, p. A59.

Nourse, Jonathan A., 1988, Tectonic evolution of a highly deformed Mesozoic-Cenozoic crustal section, north central Sonora, Mexico; abstract in 2nd Symposium on the Geology and Mineral Deposits of Sonora: Instituto de Geologia-UNAM Estacion Regional del Noroeste, Hermosillo, Sonora, 6-8 November.

Nourse, Jonathan A., 1987, Strain partitioning in the lower plate of the Sierra Magdalena metamorphic core complex, north central Sonora, Mexico, GSA Abstracts with programs,  v.19, no. 7, p. 791.

Nourse, Jonathan A. and Silver, Leon T., 1986, Structural and kinematic evolution of sheared rocks in the Rand "thrust" complex, northwest Mojave desert, California, GSA Abstracts with programs, v. 18, no. 2, p. 165.

Silver, Leon T. and Nourse, Jonathan A., 1986, The Rand Mountains thrust complex in comparison with the Vincent Thrust-Pelona Schist relationship, southern California, GSA Abstracts with programs, v. 18, no. 2. p. 185.

Nourse, Jonathan A., 1986, Reconnaissance structural analysis of sheared granitoids and associated supracrustal rocks near Magdalena de Kino, Sonora; abstract in Nueves Aportaciones a la Geologia de Sonora: Instituto de Geologia-UNAM Estacion Regional del Noroeste, Hermosillo, Sonora, 2-5 October.