Table 1
Inventory of lithostratigraphic formations and members with reference to previous work. Fm., Formation; Mbr., Member.
| Antecedents | Lithology | Main Sedimentary deposits | Fossils | Age |
|---|---|---|---|---|
| Mendibelza Fm. (Lamare, 1946, 1948; Gubler et al., 1947; Magné, 1948; Frey, 1968; Boirie, 1981; Boirie and Souquet, 1982; Fixari, 1984; Souquet et al., 1985; Johnson and Hall, 1989) |
Chaotic breccias, unorganized and stratified conglomerates, medium to coarse-grained sandstones with planar laminations and current ripples, massive or laminated sandstone, silty sandstones, dark pelites and olistoliths. The elements are mostly composed of Paleozoic to Triassic meta-sediments. | Deep basin gravity-flow deposits and turbidites | Douvilleiceras mammillatum, Puzosia sp., Kossmatella cf. demolyi, Beudanticeras, Inoceramus concentricus, Phylloceras velledae, Kossmatella cf. muehlenbecki, Hamites sp., Anisoceras cf. armatum, |
Early/Late Albian |
| Saint-Palais Fm. (Casteras et al., 1970, 1971; Boissonnas et al., 1974; Le Pochat et al., 1976; Souquet et al., 1985) |
90% of laminated black marls with spicules with 10% of interbedded fine-grained Bouma turbidites with planar lamination and current ripples. The base of the turbidites beds can present a gravel lag with centimetric polygenic clasts of Paleozoic to Triassic meta-sediments. | Hemipelagic deposits and low density turbidites | Kosmatella sp. aff. chabandi, Puzozia cf. quenstedti, Desmoceras latidorsatum, Ptychoceras sp., Beudanticeras sp., Hoplites sp., Inoceramus cf. concentricus, Variamussium cf. squamulum, Thalmanninella, Globigerina waschitensis, Aghardiellopsis cretaca, |
Late Aptian/Early Cenomanian |
| Lanne Mbr. (Fixari, 1984) |
Laminated black marls eroded by chaotic breccias with Paleozoic clasts. Unorganized conglomerates with centimetric Paleozoic pebbles and sandstones with planar lamination at their base and current ripple on their top. | Deep basin gravity-flow deposits low density turbidites | No discriminant fauna | Early/Middle Albian |
| Bustince Fm. (Bouquet, 1986) |
Breccias with angular to sub-angular Triassic-Mesozoic clasts, ranging from 1 cm to 10 cm. Olistolithes and sedimentary klippes (up to 15 km2) of Jurassic to Albian cabonates. Laminated pelites and fine-grained siliciclastic beds. | Deep basin gravity-flow deposits and turbidites | No discriminant fauna | Early/Middle Albian |
| Flysch de Mixe Fm. (Boissonnas et al., 1974; Le Pochat et al., 1976; Souquet et al., 1985; Razin, 1989; Claude, 1990) |
Laminated pelites, sandy turbidites and conglomerates. The coarse sandy turbidites consist of 1 cm up to 20 cm thick beds. Their base is composed of a lag with Paleozoic-Triassic elements. The conglomerates are characterized by a decimetric to rarely metric thickness. | Hemipelagic deposit, low and high density turbidites | Thalmanninella brotzeni, Globigerina waschitensis, Rotalipora appenninica, |
Late Albian/Early Cenomanian |
| Urdach Mbr. (Roux, 1983; Fixari, 1984, Souquet et al., 1985; Debroas et al., 2010) |
Chaotic breccias with clast size ranging from 3 cm up to 50 cm. Clasts are composed of lherzolites, gneiss, granites, schists and quartzites. This member is also composed of metric olistolithsof the same composition than the breccias. | Deep basin gravity-flow deposits | No discriminant fauna | Latest Albian/Early Cenomanian |
| Erretzu Mbr. (Fixari, 1984) |
Imbricated conglomerates with Paleozoic pebbles and laminated sandstones with a lag of the same composition than the conglomerates. The beds are erosive on laminated dark marls. | Deep basin channelized flow and turbidites | No discriminant fauna | Latest Albian/Early Cenomanian |
| Saint-Étienne-de-Baïgorry Fm. (Merle, 1974; Le Pochat et al., 1978) |
Polygenic breccias with Paleozoic to Albian clasts. Clast a size is ranging from 5 cm up to 1.5 m. Some siliciclastic-limestones are interbedded with the breccias. Albian limestone clasts range from 4 cm to 1 m. | Deep basin gravity-flow deposits | Hensonina lenticularis, Agardhiellopsis cretacea, Favusella waschitensis Paraphyllum primaevum, Hensonina lenticularis, Paraphyllum primaevum, Orbitolines, Charentia sp., |
Latest Albian/Early Cenomanian |
| Errozaté Fm. (Merle, 1974; Le Pochat et al., 1978; Durand-Wackenheim et al., 1981) |
Clast-supported breccias with clasts of Paleozoic basement, Upper Triassic ophites and Upper Albian to Santonian Calcaires des Canyons Fm. limestones. The element sizes vary from 1 cm up to 3 m. | Deep basin gravity-flow deposits | Hensonia lenticularis, Charentia sp., Charentia cuvillieri, Favusella waschitensis, Orbitolina conica, Orbitolina cuvillieri, Trocholina gr. T Arabica, Praeglobotruncana delrioensis, Rotalipora cushmani, Praealveolina cushmani, Praealveolina cretacea, Orbitolina conica, Orbitolina paeneconica, Orbitolina concava, |
Latest Albian/Santonian |
| Flysch à silex Fm. (Boissonnas et al., 1974; Le Pochat et al., 1976; Richard, 1986) |
Alternating grey marls (metric to decametric thick units), calcareous Bouma sequences and rare breccias. The conglomeratic lag of the turbidites is composed of Paleozoic to Triassic clasts. The calcarenites beds are tabular, and their basal surface is sharp and plane. | Deep basin distal calcareous turbidites | Thalmanninella Rotalipora cushmani Globotruncana stephani Gumbelina Stomiosphera spherical |
Middle/Late Cenomanian |
| Bonloc Fm. (Boissonnas et al., 1974; Claude, 1990; Saspiturry, 2019) |
Polygenic breccias with angular clasts of granulites, gneiss with garnet, quartzite, pegmatites, Paleozoic meta-sediments. and few clasts of Triassic sandstones and Albian limestones. The matrix is almost absent. The clast size ranges from 5 cm up to 1.5 m. These breccias are interbedded with calcareous turbidites of the Flysch à Silex Fm. | Deep basin gravity-flow deposits | No discriminant fauna | Latest Albian/Late Cenomanian |
| Hiruraitzeta-Fm. (Saspiturry, 2019) |
Breccias interbedded within Tc to Te Bouma calcareous turbidites of the Flysch à Silex Fm. Clasts include Triassic ophites, Devonian-Carboniferous meta-sandstones. Their size is ranging from 1 cm to 8 cm. They are mainly organized in 5 cm to 15 cm thick beds. olistoliths of Triassic ophites. | Deep basin gravity-flow deposits and calcareous turbidites | No discriminant fauna | Latest Albian/Late Cenomanian |
| Calcaires des Canyons Fm. (Souquet, 1967; Merle, 1974; Le Pochat et al., 1978; Alhamawi, 1992; Andrieu et al., 2021) |
Siltstones, sandstones and micro-conglomerates compose the lower part of the formation (Middle to Late Cenomanian). Clasts nature only corresponds to Devonian sediments. This unit grades vertically to Late Cenomanian to Turonian carbonates, consisting in bioclastic grainstones alterning with foraminifers’ rich mudstone to packstone and rudists floatstone. | Shallow marine limestones | Trocholina arabica Trocholina gr. T. Arabica Praealveolina cretacea Praealveolina simplex Orbitolina conica Ovalveolina ovum Pseudocyclammina rugosa Chrysalidina gradata Charentia cuvillieri Nezzata simplex |
Early Cenomanian to Santonian |
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