Evolución paleoecológica de las asociaciones de foraminíferos bentónicos durante el tránsito Cretácico-Terciario en La Ceiba, México
- Autores: Laia Alegret Badiola, Eustoquio Molina Martínez
- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 2, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 327-330
- Idioma: español
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Resumen
Benthic foraminifera from the Cretaceo us/Tert i ary (K/T) transition at La Ceiba (M exico) have been studied. In base of their similarity with recent benthic foraminifera and the relationship between morphological features and microhabitat preferences, as well as with the feeding habits, we inferred the paleoecology of the assemblages from sea-bottom floor. Three stages have been distinguished: mesotrophic conditions prevailed during stage I , followed by anincrease in the organic flux during stage 2, and then a sudden breakdown of the food supply in the stage 3. The pattern of paleoecological evolution, as well as a drastic fall in the primary productivity between stages 2 and 3, are consistent with the hypothesis of a bolide impact in the Yucatan at the K/T boundary
