Palynology of the Eocene-Oligocene of Simojovel, Chiapas
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Abstract
The studied area is located between Huitiupan and El Bosque, from where 64 sambles of Eocene-Oligocene age were collected from the El Bosque, La Trinidad, Rancho Berlin and La Quinta Formations. Other samples were collected between Ococingo and San Cristóbal from the El Bosque Formation and along the Agua Azul-Ococingo transect from La Trinidad Formation. This research is part of the “Palinoestratigrafía del Estado de Chiapas” project and it complements the palinological data given by Langenheim and coworkers (1967), Biaggi and coworkers (1977) and Biaggi (1978).
The palinomorphs of bicestratigraphic significance are Striadisporites sp., Monoporisporites stoverii and some pollen grains as Arecipites sp. and Psilatricolporites crassus.
Based on the relative frequence in it, three acme zones are established: I.—Inapertisporites vulgaris; II.—Monoporisporites stoverii and III.—Pellicieroipollis sp. At the same time, five range zones are proposed: A.—Psilatricolporites crassus; B.—Cicatricosisporites sp.; C.— Polypodiisporites cf. P. alienus; D.—Momipites sp. and E—Diporisporites sp.
The fungospores are present since the early Eocene and they reached their greatest abundance during Oligocene. Among the dominant species are Inapertisporites vulgaris, Inapertisporites ovalis and Monoporisporites stoverii.
In this study, the microforaminifera and scolecodonts are present only from the early Eocene to the early Oligocene. This, together with the greater abundance of dinocists, could indicate that during this time the accumulation of a transgressive facies did take place and that later, a regressive facies was deposited during the Oligocene, From a paleoecologic point of view, during Eocene-Oligocene the mangrove vegetation la characterized by the dominance of Pelliceria sp. (form-genus Pellicieroipollis) over Rhizophora sp. (form-genus Zonocostites).
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