Distribution of foraminifers in the Cabo Rojo platform and their paleoecological significance

• George A. Seiglie ^{[1] [2]}
  1. [1] University of Puerto Rico at Mayagüez

     University of Puerto Rico at Mayagüez

     Puerto Rico

     
  2. [2] Marine Biology Program, Puerto Rico Nuclear Center, Mayagüez, Puerto Rico
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 3, Nº. 1, 1971, págs. 5-33
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Eighty seven sediment samples were taken the Cabo Rojo platform, southwestern Puerto Rico, to study the sediments, mineralogy and foraminifers. This part deals with the foraminifers and their distribution. Glauconitized foraminifers were found in four different facies: beach glauconite facies, back-reef glauconite facies, middle reef basin glauconite facies and middle to outer shelf glauconite facies. The glauconitized foraminifers are characteristic of the middle and rear part of the reef. Foraminifers with the protoplasm carbonized or pyritized occur only in muddy sediments. None of the muddy bottom foraminifers were glauconitized and no reef foraminifer was carbonized or pyritized. Glauconite is formed in a different environment than pyrite. Five foraminiferal facies were determined: beach facies, reef flat facies, middle reef basin facies and reef talus and middle to outer shelf facies. The reef flat facies is subdivided in northern and southern subfacies. Archaias angulatus constitute, in part, a relict fauna. A large percentage of the foraminifers of the outer border of the reef flat are recrystallized.