Carreño, A. L. (1985). Biostratigraphy of the Late Miocene to Pliocene on the Pacific Island María Madre, Mexico. Micropaleontology. 31(2): 139-166.

334899

10.2307/1485482 [view]

Carreño, A. L.

1985

31(2): 139-166

Publication

This study of planktonic foraminifera, ostracodes and calcareous nannoplankton was undertaken to establish a paleoecological and biostratigraphic framework in the Arroyo-Hondo Section of the Pacific island María Madre, Nayarit, Mexico. A new planktonic foraminiferal species, Pulleniatina alticuspis, and three new ostracodes, Radimella mariae, R. labyrinthus, and Microxestoleberis willemi are described. The base of the section (Unit I) is barren of calcareous microfossils. On the basis of previous work on radiolarians and for its continuity in the next younger unit, it is considered latest Miocene in age. The following upper Unit II contains planktonic and benthic foraminifera that suggest a latest Miocene to Early Pliocene age. For the next younger units an Early Pliocene to Middle Pliocene age is indicated, based on the calcareous microfossil associations. In general terms, the nannoflora and microfauna suggest upper to middle bathyal depths in a subtropical environment, with intrusion of colder water masses, as evidenced by transitional forms, probably associated with the Californian current system. Finally, the affinities of some species of the Arroyo-Hondo Section with those of the Atlantic and Caribbean Province are discussed.

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