. Bulletins of American paleontology. 240 Bulletin 236. PLANKTONIC INDEXES °f'-*'ONTUN- UPPER MOHNIAN T LOWER LIMIT V SINISTRAL ZONE GLOBIGERINA PACHYDERMA Text-figure 14.—Planktonic correlation of bathyal upper Tertiary sequences within the Capistrano embayment, Orange County, California, after Ingle (1962, 1963a). Alignment of sections on presumably isochronous surfaces illustrates that the traditional Miocene-Pliocene boundary between Delmontian and Repettian stages is time-transgressive in this embayment. "Lower Pliocene" Repettian benthic faunas appeared earlier in the Capistran
. Bulletins of American paleontology. 240 Bulletin 236. PLANKTONIC INDEXES °f'-*'ONTUN- UPPER MOHNIAN T LOWER LIMIT V SINISTRAL ZONE GLOBIGERINA PACHYDERMA Text-figure 14.—Planktonic correlation of bathyal upper Tertiary sequences within the Capistrano embayment, Orange County, California, after Ingle (1962, 1963a). Alignment of sections on presumably isochronous surfaces illustrates that the traditional Miocene-Pliocene boundary between Delmontian and Repettian stages is time-transgressive in this embayment. "Lower Pliocene" Repettian benthic faunas appeared earlier in the Capistrano area than at Newport Mesa. The thickness of upper Mohnian Stage sediments introduced instantaneously by turbidity currents at Capistrano is shown by "; day (Bandy, Ingle, and Resig, 1964c, 1965b). Moreover, Natland (1950, p. -4) in a study of Pliocene faunas from the Gulf of California area was prompted to write, "Many of the abundant Gulf Pliocene forms are also abundant in the upper Miocene of California. Such species as Bolivina parva, Bulhnina ci. nvigerinajormis, and Virgulhia calijorn'iensh are not found younger than Upper Miocene in southern California . . the abun- dant species BuUmina cf. uvigennajormh, which in southern California is an excellent marker for the lower Mohnian, is abundant in most Gulf Pliocene ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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