Bioestratigrafía y sedimentología de los sedimentos detríticos del sector Macandamine, Sección 4

Abstract

Abstract: Marine sediments represent an important, high-resolution geological record of great use in paleoceanographic and paleoclimatic studies, as they record short-period climatic variability. Standardized methodologies were applied to the geological survey, characterizing the rock outcrops and the stratigraphic column with the oldest layers arranged at the bottom and the youngest at the top. These samples were analyzed in the Geology Laboratory at UTPL. The biostratigraphic results identified biozones composed of groups of cups corresponding to the Mollusca macrofauna (gastropods and bivalves) and Protista microfauna (foraminifera), with a temporal occurrence extending from the Turonian to the Maastrichtian. Sedimentology revealed that the strata are composed of feldspathic sandstone with a high content of feldspars and lithic fragments, indicating short transport or rapid burial of sedimentary deposition. This interpretation is reinforced by the low textural maturity of the grains, which suggests an origin close to the depositional area. The planktonic foraminifera and their distribution indicate that the depositional environment corresponds to intermediate-deep waters, on a medium-carbonate marine platform.