The Jurassic – Cretaceous transition in the West Cameros Basin (Tera Group, Burgos, Spain): Sedimentological and palynostratigraphical insights

Jurassic Palynology from “The Dinosaur Coast” of Asturias (Lastres Fm., Northwestern Spain): Palynostratigraphical and Palaeoecological Insights

“…In the Iberian Peninsula, it is also known from the Kimmeridgian deposits of Portugal [ 73 ]. The first occurrence of Cicatricosisporites pseudotripartitus is in the Kimmeridgian of Egypt [ 66 ] while, in the Iberian Peninsula, it is only found in Cretaceous deposits, more specifically in the Berriasian of the Cameros Basin in Northern Spain [ 33 ]. However, although the distal face of the specimen from the Lastres Formation (see Figure 7 L) is compatible with C .…”

“…The first appearance of Aequitriradites spinulosus was in the Upper Jurassic, and in Europe, the oldest record was found in the Tithonian of Romania [ 76 ]. However, in the Iberian Peninsula this taxon was only recorded in Cretaceous deposits, having its first occurrence in this region in the lowermost Berriasian of the Galve sub-Basin in the Teruel province [ 32 ] and the Early Berriasian of the Cameros Basin in Burgos province [ 33 ]. It was also frequently found along the Early Cretaceous in the Valanginian-Barremian of Burgos province [ 77 ], the Lower Valanginian of the NW Iberian offshore [ 78 ], the Barremian from Maestrazgo Basin [ 79 ] and Peñacerrada in Alava province [ 80 ], and also in the Hauterivian, Barremian and Aptian from Portugal [ 81 , 82 ].…”

“…The oldest record of Impardecispora apiverrucata apparently occurs in the Bathonian of Iran (see plate 1, Figure 8 in [ 83 ]), nevertheless the quality of the illustration provided by these authors does not allow to check the correct identification of this palynomorph. Anyway, the first appearance in the Iberian Peninsula is from the Tithonian-Berriasian deposits of Porto Pinheiro and Vale Painho in Portugal [ 29 , 84 ] and in the Berriasian of the Cameros Basin in Spain [ 33 ]. In Europe, the presence of this morphospecie in pre-Tithonian deposits is rare, and its presence in the Lastres Fm.…”

“…In Spain, there are only a few palynological studies from Upper Jurassic deposits, including the palynology from the Bathonian-Oxfordian stratigraphic levels in the Iberian Range [ 20 , 29 , 30 ] and the Lower Kimmeridgian deposits from Jaen and Teruel provinces [ 31 ]. Recently, some palynological studies were focused on the J/K boundary in the Galve area from Teruel [ 32 ], and the Cameros Basin in Burgos [ 33 ]. More specifically, in the studied area, few palaeobotanical studies were performed: a preliminary palynological study of the Vega Fm.…”

A new vertebrate assemblage from the Matute Formation of the Cameros Basin (Ágreda, Spain): implications for the diversity during the Jurassic/Cretaceous boundary

“…Authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de during the Jurassic-Cretaceous transition of the Iberian Basin Rift System (IBRS). In this regard, the southern basins of the IBRS (Maestrazgo and South Iberian basins) have yielded many of the important vertebrate Spanish localities (with multiple sites) from the Jurassic-Cretaceous transition (e.g., Ruiz-Omeñaca et al, 2004;Royo-Torres et al, 2009;Suñer & Martín, 2009;Cobos et al, 2020), but these localities are mainly known for their dinosaur remains, whereas other groups of vertebrates are comparatively scarce or not studied in detail. It is also noteworthy that the Kimmeridgian-Berriasian deposits of the IBRS have yielded a low vertebrate diversity (see supplementary material in Aurell et al, 2016;Campos-Soto et al, 2017 when compared with other Hauterivian-Barremian localities, especially those where microvertebrate remains are abundant (Ruiz-Omeñaca et al, 2004;Canudo et al, 2010).…”