Sequence Stratigraphy of the Clansayesian (Uppermost Aptian) Formations in the Western Pyrenees (France)

  1. Henry W. Posamentier2,
  2. Colin P. Summerhayes3,
  3. Bilal U. Haq4 and
  4. George P. Allen5
  1. J. L. Lenoble and
  2. J. Canérot

Published Online: 15 APR 2009

DOI: 10.1002/9781444304015.ch15

Sequence Stratigraphy and Facies Associations

Sequence Stratigraphy and Facies Associations

How to Cite

Lenoble, J. L. and Canérot, J. (1993) Sequence Stratigraphy of the Clansayesian (Uppermost Aptian) Formations in the Western Pyrenees (France), in Sequence Stratigraphy and Facies Associations (eds H. W. Posamentier, C. P. Summerhayes, B. U. Haq and G. P. Allen), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304015.ch15

Editor Information

  1. 2

    Plano, Texas, USA

  2. 3

    Godalming, UK

  3. 4

    Washington, DC, USA

  4. 5

    St Remy les Chevreuses, France

Author Information

  1. URA (CNRS) no. 1405 (Stratigraphie séquentielle et Micropaléontologie) and Laboratoire de Géologie sédimentaire et Paléontologie, Université Paul Sabatier, 39, Allées Jules Guesde, 31062 Toulouse, France

Publication History

  1. Published Online: 15 APR 2009
  2. Published Print: 17 NOV 1993

ISBN Information

Print ISBN: 9780632035489

Online ISBN: 9781444304015



  • sequence stratigraphy of Clansayesian (uppermost Aptian) formations in western Pyrenees (France);
  • Lichancumendy - corresponding to Jurassic and Cretaceous section;
  • Chapeau de Gendarme section;
  • Arudy clansayesian sequence;
  • Lichancumendy and Arudy sections - characterized by Clansayesian sequence


A diversified siliciclastic and calcareous Clansayesian (uppermost Aptian) facies association is observed in the Basque and Bearn areas of the western Pyrenees. Through the application of sequence-stratigraphic concepts, three principal systems tracts can be identified:

1 Lowstand systems tracts: calcareous mudmounds interfingering with black spicule marls (0–100 m);

2 Trangressive systems tracts: conglomerates, sandstones, siltstones and shales (0–20 m);

3 Highstand systems tracts: marls, carbonate bars, reef complexes, overlain by shelf limestones (up to 150 m).

The lowstand systems tracts deposits are located on the lowest part of crustal blocks tilted towards the southwest or southeast that occur on the Iberian margin of the Pyrenees. The transgressive systems tracts deposits backstep landward and aggrade over the preceding systems tracts. Finally, the highstand systems tracts deposits prograde regularly basinward and are separated from the underlying transgressive systems tracts by a maximum flooding surface (condensed section). Subaerial erosional unconformities separate the sequence from the sedimentary units above and below.

This sequence can be correlated with the third-order ZB 4.2 sequence of the global sea-level cycle chart of Haq et al. (1987). In the study area, this interval corresponds to a period of strong extensional (transtensional) tectonics leading to the development of Albian flysch basins on the underlying Aptian carbonate platform. Nevertheless, in spite of this tectonic activity, the facies associations and distribution observed here support an interpretation suggesting the strong influence of eustatic changes on the sedimentary succession.