Foraminifera source details
Frizzell, D.L., 1943. Upper Cretaceous foraminifera from northwestern Peru. Journal of Paleontology, 17: 331-353.
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Frizzell, D.L., 1943. Upper Cretaceous foraminifera from northwestern Peru. Journal of Paleontology, 17: 331-353
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The Mal Paso shale, known only in subsurface in the Department of Piura, Peru, reaches a maximum thickness of over 6500 feet. The upper half of the formation carries a distinctive predominantly arenaceous foraminiferal fauna, which is correlated with parts of the Tamesi formation of Mexico, the Tarouba formation of Trinidad, the Santa Anita formation of Venezuela, and the Mito Juan and "Orocue" formations of Colombia. Below the Mal Paso shale are conglomerates, underlain possibly unconformably by shales of the Copa Sombrero formation. In the vicinity of Negritos, no sedimentary break separates the Mal Paso from overlying basal Tertiary shales. A total of 52 species and varieties of Foraminifera are described from the Mal Paso shale, 15 of which are new.
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Cyclammina garcilassoi Frizzell, 1943 † accepted as Reticulophragmium garcilassoi (Frizzell, 1943) † (original description)
Dentalina oviedoi Frizzell, 1943 † (original description)
Discorbis hascari Frizzell, 1943 † (original description)
Eponides huaynai Frizzell, 1943 † (original description)
Eponides zaratei Frizzell, 1943 † (original description)
Haplophragmoides atahuallpai Frizzell, 1943 † (original description)
Haplophragmoides zaratei Frizzell, 1943 † (original description)
Lagena malpasoensis Frizzell, 1943 † (original description)
Marginulina coya Frizzell, 1943 † (original description)
Pseudoglandulina marginuliniformis Frizzell, 1943 † accepted as Glandulina marginuliniformis (Frizzell, 1943) † (original description)
Robulus capac Frizzell, 1943 † (original description)
Siphogenerinoides plummeri var. coya Frizzell, 1943 † (original description)
Spiroplectammina grzybowskii Frizzell, 1943 † accepted as Spiroplectammina spectabilis (Grzybowski, 1898), emend. Kaminski, 1984 † (original description)
Trochammina lejesemai Frizzell, 1943 † (original description)
Trochammina ondegardoi Frizzell, 1943 † (original description)
Dentalina oviedoi Frizzell, 1943 † (original description)
Discorbis hascari Frizzell, 1943 † (original description)
Eponides huaynai Frizzell, 1943 † (original description)
Eponides zaratei Frizzell, 1943 † (original description)
Haplophragmoides atahuallpai Frizzell, 1943 † (original description)
Haplophragmoides zaratei Frizzell, 1943 † (original description)
Lagena malpasoensis Frizzell, 1943 † (original description)
Marginulina coya Frizzell, 1943 † (original description)
Pseudoglandulina marginuliniformis Frizzell, 1943 † accepted as Glandulina marginuliniformis (Frizzell, 1943) † (original description)
Robulus capac Frizzell, 1943 † (original description)
Siphogenerinoides plummeri var. coya Frizzell, 1943 † (original description)
Spiroplectammina grzybowskii Frizzell, 1943 † accepted as Spiroplectammina spectabilis (Grzybowski, 1898), emend. Kaminski, 1984 † (original description)
Trochammina lejesemai Frizzell, 1943 † (original description)
Trochammina ondegardoi Frizzell, 1943 † (original description)