Abstract
The palynological content of Cachipunco Formation is described in this contribution. This formation lies in the Santa Barbara Range, Jujuy Province, and outcrops at two localities: Angosto Los Pereyras and Cumbre los Pereyras. The more complete succession is the one from Angosto Los Pereyras, where the formation comprises 273 m of dark siltstones interstratified with thin sandstones and without visible base or top. The microfloristic associations are characterized by the presence of: Ammonidium ludloviense (Lister) Dorning, Barbestiastra barbata (Downie) Sarjeant & Stancliffe, Domasia quadrispinosa Hill, Leiofusa exilata Dorning, L. parvitatis Loeblich, Multiplicisphaeridium arbusculum Dorning, M. eoplancktonicum (Eisenack) Lister, Neoveryhachium carminae Cramer, Proteolobus cylindricus Al-Ruwaili, Tylotopalla maraca Diez & Cramer, T. robustispinosa (Downie) Eisenack et al., Veryhachium trisphaeridium Downie, and Ambitisporites avitus Hoffmeister. According to the stratigraphic distribution of the theses species, the age of the Cachipunco Formation can be constrained to a Wenlockian-Ludlovian range. A new species is proposed Multiplicisphaeridium baldisii sp. nov.
Highlights
During the Silurian, in the Central Andean Basin (Fig. 1.1), that extends from Peru to North-western Argentina (Benedetto et al, 1992), a thick and fossiliferous, siliciclastic succession was deposited, which appears nowadays deformed and dismembered due to the Andean tectonics
In North-western Argentina, the most important outcrops of this succession are those from the Subandean Range, especially the ones from the Zapla and Santa Barbara ranges, in Jujuy and Salta provinces
Forty palynological samples were collected from the Cachipunco Formation, 30 of which were found to be productive
Summary
During the Silurian, in the Central Andean Basin (Fig. 1.1), that extends from Peru to North-western Argentina (Benedetto et al, 1992), a thick and fossiliferous, siliciclastic succession was deposited, which appears nowadays deformed and dismembered due to the Andean tectonics. In North-western Argentina, the most important outcrops of this succession are those from the Subandean Range, especially the ones from the Zapla and Santa Barbara ranges, in Jujuy and Salta provinces. In the Zapla range (Fig. 1.2), the main litostratigraphic units are Zapla Formation (Schlagintweit, 1943) and Lipeón Formation (Turner, 1960) while at Santa Barbara range, the correlative litostratigraphic units are Revista del Museo Argentino de Ciencias Naturales, n. Lipeón Formation comprises a monotonous succession, between 600 and 1,600 metres in thickness, of siltstones and fossiliferous sandstones. Benedetto et al (1992) gave this formation a Llandoverian-Pridolian age, but Rubinstein & Toro (2006) assigned it to the Llandovery-Ludlow based on the palynomorphs and graptolites content
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