Journal article

Analisis de biofacies y cambios relativos del nivel del mar en el Miembro Pilmatue de la Formacion Agrio, Cretacico Inferior de cuenca Neuquina, Argentina

Ameghiniana, vol. 44, issue 1 (2007) pp. 73-89

  • 7


    Mendeley users who have this article in their library.
  • N/A


    Citations of this article.
Sign in to save reference


A biofacies analysis based on benthic macrofossils was carried out. The study unit is the Pilmatue? Member of the Agrio Formation in three sections in the Neuque?n Province. Six biofacies controlled by relative sea level changes, sedimentation rate, substrate consistency, oxygenation and salinity were recognised. The "Cucullaea-Mimachlamys-Steinmanella biofacies" is highly diverse and recorded in a shoreface environment characterized by a well-oxygenated soft sandy and patchy bioclastic substrate, reduced siliciclastic input, normal marine salinity, and warm-temperate waters. The "coral colonies biofacies" is associated with the former biofacies, but in a more shallow setting and probably temperatures above 16_-18_ C The "Cucullaea and Steinmanella biofacies" occurred in an open shelf environment characterized by low water energy, reduced siliciclastic input, firm muddy substrate, and normal marine conditions. The "Modiolus biofacies" also occurs on the shelf, but under low oxygenation. The "gregarious serpulids" and "gregarious oysters" biofacies correspond to an inner shelf setting characterized by an alternation of high and low water energy, low siliciclastic input, firm muddy substrate, well-oxygenated bottom, and mixo-euharine conditions. The "Cucullaea-Mimachlamys-Panopea" and "Cucullaea and Steinmanella" biofacies are related to changes of relative sea level in the scale of parasequences, while the "coral colonies", "Modiolus", "gregarious oysters", and "gregarious serpulids" respond to changes in the scale of sequences. _Asociacio?n Paleontolo?gica Argentina.

Author-supplied keywords

  • Argentina
  • Benthic macrofossils
  • Paleoecology
  • Paleoenvironments
  • Valanginian- hauterivian

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

There are no full text links


  • D G Lazo

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free