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Foraminifera of the Monterey Shale and Puente Formation, Santa Ana Mountains and San Juan Capistrano Area, California

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Foraminifera of the Monterey Shale and Puente Formation, Santa Ana Mountains and San Juan Capistrano Area, California Foraminifera of the Monterey Shale and Puente Formation, Santa Ana Mountains and San Juan Capistrano Area, California GEOLOGICAL SURVEY PROFESSIONAL PAPER 294-M Foraminifera of the Monterey Shale and Puente Formation, Santa Ana Mountains and San Juan Capistrano Area, California By PATSY BECKSTEAD SMITH SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY GEOLOGICAL SURVEY PROFESSIONAL PAPER 294-M UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1?60 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington 25, D.C. - Price 40 cents (paper cover) CONTENTS Page Page AbstracL-------------~---------------------------- 463 Faunas-Continued Introduction ______________________________________ _ 463 Geographic divisions-Continued Acknowledgments ______________________________ _ 464 Area west of Oso Creek _____________________ _ 473 Previous work _________________________________ _ 464 Faunal summary _______________________________ _ 476 Preparation of samples _____________________________ _ 464 Correlation of formations and stages _________________ _ 478 General geology ____________________________________·_ 464 Conclusions _______________________________________ _ 478 Stratigraphy ___________________________________ _ 464 Systematic catalog _________________________________ _ 480 Structure _____________________________________ _ 466 Family Lagenidae ______________________________ _ 480 Faunas ___________________________________________ _ 466 Family N onionidae _____________________________ _ 481 Miocene Foraminiferal stages of Kleinpell (1938) __ _ 466 Family Buliminidae ____________________________ _ 481 Miocene stages of the Santa Ana Mountains and Family Rotaliidae ______________________________ _ 485 San Juan Capistrano area _________________ _ 466 Family Cassidulinidae __________________________ _ 487 Relizian(?) stage _______________________ _ 466 Family Chilostomellidae ________________________ _ 488 Luisian stage __________________________ _ 466 Family Globigerinidae __________________________ _ 488 Mohnian stage _________________________ _ 467 Family Anomalinidae ___________________________ _ 488 Geographic divisions ___________________________ _ 468 Foraminifera localities, Santa Ana Mountains and San Northern and central Santa Ana Mountains ___ _ 468 Juan Capistrano area _____________________________ _ 488 Southwestern Santa Ana Mountains __________ _ 470· References ________________________________________ _ 491 Area east of Oso Creek _____________________ _ 470 Index ____________________________________________ _ 492 ILLUSTRATIONS PLATES 57-59. Foraminifera of the Monterey shale and Puente formation ____________________________________ Following index Page FIGURE 155. Index map and map showing distribution of the Puente formation in the Santa Ana Mountains ___________ _ 465 156. Map of the Monterey shale and Puente formation in the San Juan Capistrano area and structure section across the Capistrano syncline __________________________________________________________________ _ 471 157. Columnar sections of middle and upper Miocene rocks _______________________________________________ _ 479 TABLES TABLE 1. Test wells and core holes sampled and measured__________________________________________________________ 463 2. Stages and foraminiferal zones of the Miocene of California ___________ "7 _____________________________ - _- _--- 467 3. Distribution of Foraminifera from the northern Santa Ana Mountains ________________________________ - __ - _ _ 469 4. Distribution of Foraminifera from the southwestern Santa Ana Mountains___________________________________ 470 5. Distribution of Foraminifera from the area east of Oso Creek______________________________________________ 472 6. Distribution of Foraminifera from Shell Oil Co.'s Mission contrafiush No. 38--------------------------------- 473 7. Distribution of Foraminifera from Shell Oil Co.'s Moulton core hole No. 14__________________________________ 474 8. Distribution of Foraminifera from the area west of Oso Creek ___________________________________________ -__ 4 7 5 9. Distribution of Foraminifera from Shell Oil Co.'s Moulton contrafiush No. 32________________________________ 476 10. Geologic ranges of more important Foraminifera__________________________________________________________ 477 Ill SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY FORAMINIFERA OF THE MONTEREY SHALE AND PUENTE FORMATION, SANTA ANA MOUNTAINS AND SAN JUAN CAPISTRANO AREA, CALIFORNIA By PATSY BECKSTEAD SMITH ABSTRACT In the Santa Ana Mountains and San Juan Capistrano area, are oyerlain Ull(:Onformably by the Puente formation (Mohn­ Orange County, Calif., thick sections of Miocene sedimentary ian stage). rocks are exposed. '!'hey are assigned to the Monterey shale. On the east flank of the Capistrano syncline, south of the of middle and late Miocene age and the Puente formation of El Toro Air Station, the ·Topanga formation is overlain by the late Miocene age. The area described is divided into four Monterey shale, which ranges in age from late Luisian at the base to l\fohnian at the top. geographic units: the northern and central Santa Ana Moun­ To the west of Oso Creek, the Topanga formation is overlain tains, the southwestern Santa Ana Mountains, the area east by the Monterey shale which ranges in age from early Luisian of Oso Creek (east flank of the Capistrano syncline), and the at the base to late Luisian and Mohnian at the top. area west of Oso Creek (west flank of the Capistrano syncline). Changes in thicknesses of rocl\:s assigned to the Luisian ·and The faunal assembl·ages of each area are compared with those Mohniah stages are due to unconformities and local depositional of the California Miocene stages proposed by Kleinpell ( 1938). variations. No evidence was found to indicate that foraminif­ In the Santa Ana Mountains, the Topanga formation (Re­ eral faunas assigned to the Mohnian stage grade laterally into lizian (?) stage) and the El l\1odeno volcanics (Luisian stage) faunas of the Luisian stage. INTRODUCTION The U.S. Geological Survey carried on oil and gas ney, J. E. Schoellhamer, R. F. Yerkes, J. G. Vedder, investigations in and near the Santa Ana Mountains, a.nd the author, all of the U.S. Geological Survey. The Orange County, Calif. (index map, fig. 155), from localities sampled are shown on the accompanying 1949 to 1955, and during this time, many hundred foram­ maps (figs. 155 and 156) and are · described on iniferal samples from this area were collected and p. 488-490. The maps also show areas of outcrop of examined. This report is a result of a study of Foram­ upper middle and upper Miocene rocks and the loca­ inifera of the :Monterey shale and Puente formation. tions of test wells and core holes that were used in con­ The stratigraphic and geographic distribution of the structing the structure section and that were sampled Foraminifera is discussed. for Foraminifera. These wells and core holes are listed Foraminiferal sa.mples were collected by D. M. IGn- in table 1. TABLE I.-Test wells and core holes sampled and measured Well No. (on Elevation Total depth ·maps) Operator and name of well Location (feet) (feet) 1 Shell Oil Co., lVIoulton contraflush No. 3L_ vV est of Aliso Creek, Capistrano area (fig. 156) ______ 330 728 2 Shell Oil Co., Moulton core hole No. 14 ____ Between Aliso and Oso Creeks (figs. 156, 157; table 190 2, 723 7). 3 Shell Oil Co., Moi1lton contraftush No. 35 __ Oso Creek, Capistrano area (fig. 156) _______________ 311 895 4 Shell Oil Co., :Mission contraftush No. 36 __ Between Oso Creek and Arroyo Trabuco (fig. 156) ___ 446 799 5 Shell Oil Co., Mission contraftush No. 37 __ Between Oso Creek and Arroyo Trabuco (fig. 156) ___ 684 698 6 Shell Oil Co., Mission contraftush No. 38 ___ Arroyo Trabuco (figs. 156, 157; table 7) _____________ 462 766 7 McKee Oil Co., Kokx Community No. 8-1 Southwest of Burruel Ridge (fig. 155) ______________ 280 4, 005 8 Rubicon Oil Co., Wilcox No. L ___________ South of Santa Ana River (figs. 155 and 157) ________ 450 6, 324 9 G. D. Murdoch, Howell No.!_ ___________ South of Santa Ana River (fig. 155) _______________ 308 4, 370 10 Shell Oil Co., Moulton contraftush No. 32 __ West of Aliso Creek (fig. 156 and table 9) ___________ 165 623 463 464 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY ACKNOWLEDGMENTS mounted systematically on slides. The remaining por­ tion of the washed sample was examined for species Valuable information provided by G. H. Doane and not found in the final split, and specimens of any rare M. vV. Hurley of the Shell Oil Co., ~I. L. Na.tland and species found were mounted separately. W. T. Rothwell of the Richfield Oil Corp., and W. H. Tables showing distribution (Nos. 3-9) were pre­ Holman of the Standard Oil Co. of California is grate­ pared from these slides, with samples listed as nearly fully acknowledged. R. M. l{leinpell of the University possible in stratigraphic sequence. The percentage of of California at Berkeley ga.ve helpful advice and as­ each species present is represented by a symbol. Total sisted on taxonomic problems. The .Jones microsplit­ population was calculated on the basis of the number of ter used in prepa.ring samples was borrowed from the splits and is given on the table of distribution for each California Institute of Technology. sample. Some forms were found which, because of poor pres­ PREVIOUS WORK ervation. or a slight difference from the typical form,
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