Alguns Macroforaminífers del Biarritzià català

Authors

  • Esmaragda Caus i Gràcia

Abstract

The Biarritzian of the west side of the Segre Valley is formed by Alveolina limestones. These facies are different from the east side ones (shales) because the Segre Fault (GARRIDO, 1972) conditioned the geometry of the sedimentary basin and stablished, in the west side, a shallow, clean water platform which favoured the development of Large Foraminifera.
Three profiles are obtained, St. Llorenç de Montgai (447 m), St. Tomàs (163 m) and Ivars de Noguera (95 m). These profiles are lying on the red-beds of the Pontils Formation. When present, the overluing formation is the post-orogenic conglomerates. The Alveolina limestone is equivalent to the Rocacorba Formation.
The Foraminifera founded in this sediments belong mainly to the porcellaneous Foraminifera (Alveolinidae, Soritidae, Milioidae), except for some agglutinated and hyalin Foraminifera.

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Published

2005-05-26

Issue

Vol. 40 : 1976 (Secció de Geologia, 1)

Section

Articles

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