Abstract

PATARROYO, Pedro. HIGH ENERGY LEVEL AMMONITES OF THE PAJA FORMATION EARLY BARREMIAN IN THE VILLA DE LEYVA (BOYACÁ) AND VÉLEZ (SANTANDER) AREAS - COLOMBIA. bol.geol. [online]. 2009, vol.31, n.2, pp.15-21. ISSN 0120-0283.

In different areas near Vélez (Santander) as La Paz, Chipatá, Bolívar and Guavatá it was identified a stratum with variable thickness, biostratonomy and characteristic fossil association. This bed had already been recognized in the Villa de Leyva (Boyacá) area, and located to the lower Barremian into the lowest multicolor mudstones level strata of the Paja Formation. The chaotic accumulation of molluscs fragments, complete ammonites, trunks and foraminifera is its principal characteristic, which makes its easy recognition in the field. To Villa de Leyva was possible to identify into the bed Crioceratites sp., Acrioceras julivertii Etayo-Serna, Pseudohaploceras incertum (Riedel), Nicklesia pulchella (D’Orbigny), Acanthoptychoceras trumpyi Kakabadze & Thieuloy, Phylloceras sp., Buergliceras buerglii Etayo-Serna, Valdedorsella sp. y Karsteniceras beyrichi (Karsten). To Vélez area Pedioceras sp., Nicklesia pulchella (D’Orbigny), Acanthoptychoceras trumpyi Kakabadze & Thieuloy, Buergliceras buerglii (Etayo-Serna) y Pseudohaploceras incertum (Riedel). The ammonite association indicates the Nicklesia pulchella biozone of the Colombian early Barremian. The recognition of this level with a high-energy accumulation to the areas of Villa de Leyva and Vélez can be indicating a regional distribution of a sedimentary event with these characteristics to the lower part of the Barremian from Colombia, which could be setting a sequence boundary to the basis of a high-energy transgressive system.

Keywords : Early Barremian; Paja Formation; Villa de Leyva (Boyacá); Vélez (Santander),.

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