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Auteur Larry A. Beyer |
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1690 - Mid-Tertiary Isopach and Lithofacies Maps for the Los Angeles Region, California (Bulletin de U.S. Geological Survey professional paper, 1690 [01/01/2004]) / Thane H. Mc Culloh
[n° ou bulletin]
Titre : 1690 - Mid-Tertiary Isopach and Lithofacies Maps for the Los Angeles Region, California : Templates for Palinspastic Reconstruction to 17.4 Ma Type de document : texte imprimé Auteurs : Thane H. Mc Culloh, Auteur ; Larry A. Beyer, Auteur Année de publication : 2004 Importance : 1 vol. (32 p.) Présentation : ill., cartes, couv. ill. Format : 28 cm Langues : Américain (ame) Résumé : Opening of the Neogene Los Angeles Basin began abruptly about 17.4 Ma. Extensional rifting, with local basaltic volcanism, began the process and accompanied its early stages. Crustal detachment, followed by clockwise tectonic rotation and translation of large crustal blocks has been shown by previous paleomagnetic declination measurements in the western Transverse Ranges Province northwest of the basin and by large strike-slip and dip-slip separations on several major faults transecting it. Successful palinspastic reconstruction of the region to its arrangement before 17.4 Ma depends on understanding and integration of many stratigraphic and structural components. Before 17.4 Ma, fluviatile, alluvial and floodplain deposits, interstratified in the younger part with shallow marine to deeper shelf transgressive equivalents, accumulated to thicknesses as great as several kilometers. This report maps the surface and subsurface extents, thickness variations, and facies patterns of these strata, the Sespe plus Vaqueros and Trancas Formations or equivalents. Separate southeast and northwest sectors are revealed, each with distinctive internal thickness and facies patterns, which must have been related before rifting and transrotation. Terrestrial vertebrate and marine molluscan and foraminiferal fossils, plus magnetostratigraphic profiles of other workers and a few dates of igneous rocks, provide timing for key depositional and structural events. Our preliminary reconstruction of the region brings the internal patterns of the northwest and southeast sectors toward congruity but leaves unsatisfied discrepancies that suggest important information is missing. The reconstruction focuses attention on critical elements, specific uncertainties, and deficiencies of prior reconstructions. It also provides a new foundation for further work [n° ou bulletin]Exemplaires(1)
Code-barres Origine Cote Support Section Disponibilité FFS035827 2.2 USGS PP Périodiques Géographique Exclu du prêt 1649 - Mountain Meadows Dacite (Bulletin de U.S. Geological Survey professional paper, 1649 [01/01/2001]) / Thane H. Mc Culloh
[n° ou bulletin]
Titre : 1649 - Mountain Meadows Dacite : Oligocene intrusive complex that welds together the Los Angeles Basin, northwestern Peninsular Ranges, and central Transverse Ranges, California Type de document : texte imprimé Auteurs : Thane H. Mc Culloh, Auteur ; Larry A. Beyer, Auteur ; Ronald W. Morin, Auteur Année de publication : 2001 Importance : 1 vol. (34 p.) Présentation : ill., cartes, couv. ill. Format : 28 cm Langues : Américain (ame) Catégories : Régions
Californie[n° ou bulletin]Exemplaires(1)
Code-barres Origine Cote Support Section Disponibilité FFS035799 2.2 USGS PP Périodiques Géographique Exclu du prêt