. Bulletins of American paleontology. 72 Bulletin 371. Texl-tigiire 45.—NLuonii Mudstonc Member, west cil the roiid from Siin Felipe to Between Arroyo MlUoihi and Arroyo El Canclo, the mustard-colored beds contain large, double-valved oysters with distinctive radial furrows; the sediments are overlain by a 2-m ash bed and terrace deposits. Photo, J. T. Smith. 1987. and latest Middle Mit)cone (Gastil ci a!.. 7). 1999; table Dclicicis Siuulstonc Mcinhcr. Pliocene.—The stra- totype tor tiie Delicias Sandstone Member is a com- posite ot sections exposed along the southern and east-
. Bulletins of American paleontology. 72 Bulletin 371. Texl-tigiire 45.—NLuonii Mudstonc Member, west cil the roiid from Siin Felipe to Between Arroyo MlUoihi and Arroyo El Canclo, the mustard-colored beds contain large, double-valved oysters with distinctive radial furrows; the sediments are overlain by a 2-m ash bed and terrace deposits. Photo, J. T. Smith. 1987. and latest Middle Mit)cone (Gastil ci a!.. 7). 1999; table Dclicicis Siuulstonc Mcinhcr. Pliocene.—The stra- totype tor tiie Delicias Sandstone Member is a com- posite ot sections exposed along the southern and east- ern front of the Siena San Fermin in the Puertecitos quadrangle. It is Pliocene in age. the lower part crop- ping out in a hill north of Arroyo el Canelo and the upper part forming marine terraces at Campo Cristina, 500 m south of the San Felipe-Puertecitos road be- tween km 57 and the gulf. Fossiliferous muddy sand- stones alternate with sandstone-siltstone beds, re- worked ash-lapilii, and bentonitic layers: coarser ma- rine deposits cap the section in Valle Curbina. where it is unconformably overlain by alluvial conglomerate. The member is not correlative with the earlier named Early to Middle Eocene Delicias Formation of the Ti- juana basin (Flynn. 1970). Marti'n-Barajas el nl. ( 1997) regard the lower section of the Delicias Sandstone Member as time-transgres- sive; the upper part of the unit intertingers v\ith several distinct pyroclastic deposits. Tuffs assoviaiecl uiih the upper Pueriecitos For- iiuuion. infonnul names (if Stock el al. (/'>y6). Eciiiy to Late Pliocene.—Extrusive volcanic units. includinL; the tuff of Valle Curbina. informal name, are interbed- ded with or overlie the Puertecitos Formation. They include pyroclastic deposits shown on the maps by Stock et al. (1996) and in our column for the Puerte- citos embayment as "Ptb" (dark gray lithic tuff). "Ptg"" (white, crystal-rich pumiceous tuff) and "Ptf (reworked air-fal
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