Stratigraphical correlation of the Late Jurassic Lourinhã Formation in the Consolação Sub-basin (Lusitanian Basin), Portugal

Abstract

The c. 700 m thick succession of continental–brackish‐marine deposits forming the Lourinhã Formation, cropping out along the coast of western Portugal between Baleal and Santa Cruz, has been correlated using laterally persistent shelly marker beds. Three shelly units record the episodic establishment of relatively short‐lived, brackish‐marine embayments, transgressing from the southwest, onto a low‐lying coastal plain. The succession displays systematic changes in facies types and stacking patterns reflecting differences in fluvial style, bedload character and palaeontological content. Based on these observations, four new members for the Lourinhã Formation are proposed: the Sáo Bernardino, Porto de Barças, Areia Branca and Ferrel members. New biostratigraphical data indicate that the Lourinhã Formation is Late Kimmeridgian to earliest Early Tithonian in age. This age has also been obtained from the underlying mixed carbonate and clastic deposits of the Abadia Formation at Consolação. As a result, these latter sediments are now re‐assigned to the Alcobaça Formation, a lithostratigraphical term currently in use in other areas of the Lusitanian Basin. Improved regional mapping of the Lourinhã Formation has established a new sub‐basin within the western parts of the Lusitanian Basin. This sub‐basin, now named the Consolação Sub‐basin, is bounded to the east by the Lourinhã–Caldas de Rainha (L–C) fault zone and to the west by the Berlengas Horst. Copyright © 2013 John Wiley & Sons, Ltd.

The age of the Tojeira Formation (Late Jurassic, Early Kimmeridgian), of Montejunto, west-central Portugal

“…5) illustrate the range base of D. pannea within the Late Oxfordian of Qatar, though the authors do not denote the source clearly. Likewise, elsewhere in Portugal, Taylor et al (2014) find D. pannea throughout the Lourinhã Formation (A. eudoxus-Hybonoticeras hybonotum Tethyan zones) and reference its base within the A. hypselocyclum Zone, Early Kimmeridgian (see Taylor et al 2014, Fig. 6).…”

Upper Jurassic sauropod record in the Lusitanian Basin (Portugal): Geographical and lithostratigraphical distribution

“…The Central Sector of the Lusitanian Basin has been divided into three Upper Jurassic sub-basins, the Turcifal, Arruda, and Bombarral (Figure 2.1), based on isopachs and facies distribution (Pena dos Reis et al, 1996Reis et al, , 2000. The stratigraphy of the Upper Jurassic sequence of the Lusitanian Basin is complex, due the profuse lateral heterogeneity and the proposal of several and different stratigraphic approaches (e.g., Hill, 1988;Leinfelder, 1993;Manuppella et al, 1999;Kullberg et al, 2006;Schneider et al, 2009;Martinius and Gowland, 2011;Taylor et al, 2014). Figure 3 presents the stratigraphic correlations between the nomenclature proposed for the areas considered in this manuscript: i) Turcifal Sub-basin (stratigraphy based on Pereda- Suberbiola et al, 2005;Kullberg et al, 2006;Schneider et al, 2009); ii) Arruda Sub-basin (stratigraphy based on Kullberg et al, 2006); iii) Consolação Sub-basin areas: Torres Vedras-Lourinhã-Peniche (stratigraphy based on Manuppella et al, 1999), Foz do Arelho-Nazaré coastal sector (stratigraphy based on Kullberg et al, 2006;Azerêdo et al, 2010); iv) Bombarral-Alcobaça Sub-basin (stratigraphy based on Kullberg et al, 2006;Azerêdo et al, 2010); v) Batalha-Leiria region (stratigraphy based on Manuppella et al, 2000;Kullberg et al 2006;Escaso et al, 2007a), and vi) Pombal region (stratigraphy based on Kullberg et al, 2006;.…”

“…This formation seems to be coincident with the upper part of the Alcobaça, Praia da AmoreiraPorto Novo, Sobral, Freixial, and Bombarral Formations referenced by other authors, including the Portuguese Geological Surveys (e.g., Manuppella et al, 1999). The use of this unit outside the area corresponding to the Consolação Sub-basin of Taylor et al (2014) is not completely established in literature (e.g., Hill, 1988;Kullberg et al, 2006;Schneider et al, 2009;Ribeiro and Mateus, 2012;Kullberg et al, 2013;Mateus et al, 2013). Yagüe et al (2006) therefore incorporate the entire Alcobaça Formation and the previously defined Lourinhã Formation into a new lithostratigraphic unit, the Lourinhã Group.…”

“…spdl, posterior spinodiapophyseal lamina; poz, postzygapophyses; prsl, prespinal lamina; prdl, prezygodiapophyseal lamina; prz, prezygapophyses; spof, spinopostzygapophyseal fossa; spol, spinopostzygapophyseal lamina; sprf, spinoprezygapophyseal fossa; sprl, spinoprezygapophyseal lamina; tap, triangular aliform process; tb, tuberosity; tia, tibial articular sur-FIGURE 2. Lusitanian Basin (divided into three sectors following Ribeiro et al, 1996) with the location of the Upper Jurassic sub-basins following two different interpretations: (1) location of Bombarral, Turcifal and Arruda Sub-basins (Guery, 1984;Kullberg, 2000;Kullberg et al, 2006) (modified from Kullberg, 2000); (2) location of Bombarral-Alcobaça, Consolação, Arruda and Turcufal Sub-basin (modified from Taylor et al, 2014 …”

“…The right column shows the known stratigraphic distribution of the main sauropod clades along the Kimmeridgian-Tithonian sedimentary sequence in the Lusitanian Basin. The black bar indicates the known stratigraphic distribution of the established sauropod taxa (1, Zby atlanticus; 2, Dinheirosaurus lourinhanensis; 3, Lourinhasaurus alenquerensis; 4, Lusotitan atalaiensis); CSb, Consolação Sub-Basin (following Taylor et al, 2014).…”