Resumen de The distribution of the Foraminifers in the Yabucoa Bay, southeastern Puerto Rico, and its paleoecological significance
Thirty sediment samples were taken in Yabucoa Bay, southeastern Puerto Rico, to study distribution of the foraminifers. Four foraminiferal facies were determined: marine-fluvial facies, bay facies, glauconitized and goethitized facies and reef facies. Glauconite is considered to be formed under the slight influence of river waters and fine sediments. Large amounts of river sediments do not permit glauconitization. No foraminifer of the fluvial-marine or bay facies was found glauconitized. Most of the living foraminifers in the glauconitized and goethitized facies do not live in the sediments but on the algae. Use of glauconite in paleoecology permits the comparison of present and fossil environments. The highest percentages of living foraminifers and the largest number of living foraminifers per gram occur in the bay and reef facies. Amphistegina gibbosa is the most abundant reef foraminifer. Archaias angulatus is receding in the bay or constitutes in part a relict fauna. Heterostegina antillarum entered in the bay recently.
