Discussion on ‘Middle Jurassic multi‐scale transgressive–regressive cycles: An example from the Lusitanian Basin’, by Magalhães et al., Depositional Record , 2023, 9(1), 174–202

• Published in: The depositional record Vol. 9; no. 4; pp. 1153 - 1160
• Main Authors: Azerêdo, Ana C., Correia, Vânia F., Fraguas, Ángela
• Format: Journal Article
• Language: English
• Published: Hoboken John Wiley & Sons, Inc 01-11-2023; Wiley
• Subjects: Age; Jurassic; Stratigraphy; Portugal
• ISSN: 2055-4877; 2055-4877
• DOI: 10.1002/dep2.252

The authors used a sequence stratigraphic approach, defining multi-scale cycles and, based on nannofossils and dinoflagellate cysts (dinocysts) data, they re-assigned the section to the Middle Jurassic ‘Candeeiros Formation’; formerly the section had been established as part of the Upper Jurassic Alcobaça Formation (namely Fürsich et al., 2022; Leinfelder, 1986; Manuppella et al., 1999; Schneider et al., 2009; Werner, 1986). [...]the new fossil data are too briefly discussed and based on limited data, and the local/regional geology is barely discussed. [...]it marks the top of the studied succession. ( 2023) use to constrain the studied interval (the top corresponding to the Middle/Upper Jurassic disconformity) is not valid. [...]the Middle/Upper Jurassic basin wide disconformity (late Callovian to early Oxfordian) is a very well constrained and documented event in the LB (namely Azerêdo et al., 2002; Guéry et al., 1986; Kullberg & Rocha, 2014; Leinfelder & Wilson, 1998; Ruget-Perrot, 1961).