RT Journal Article
T1 The Jurassic – Cretaceous transition in the West Cameros Basin (Tera Group, Burgos, Spain): sedimentological and palynostratigraphical insights
A1 Rodríguez Barreiro, Iván
A1 Santos López, Artai Antón
A1 Arribas, Mª. Eugenia
A1 Mas, Ramón
A1 Arribas, José
A1 Villanueva Amadoz, Uxue
A1 Torcida Fernández-Baldor, Fidel
A1 Diez Ferrer, Jose Bienvenido
K1 2416.01 Paleontología Animal
K1 2416.04 Paleontología de las Plantas
K1 2416 Paleontología
AB The Jurassic–Cretaceous boundary transition is widely distributed within the West Cameros Basin. This horizon is constituted by the Tera Group, consisting of two depositional sequences (DS1 and DS2) comprising four geological formations spanning the Tithonian to the Berriasian. Here, a combined sedimentological and palynostratigraphic study was made covering the Tera Group. The sedimentological results for the DS 1 differentiate three facies associations (FA 1-1, 1-2 and 1-3) corresponding to floodplains and braided channels of a distributive fluvial system shifting to shallow lacustrine facies in a semi-arid climate. For the DS 2, three FA were also differentiated (FA 2-1, 2-2, and 2-3), corresponding to tidal-influenced meandering channels and floodplains in a distal fluvial to a delta-plain system that shifts to shallow lacustrine facies. The palynological results were only productive in samples from the Jaramillo Formation. The palynological record shows an assemblage dominated by spores including Concavissimisporites, Leptolepidites and Taurocusporites, as well as Classopollis pollen. According to the stratigraphic ranges of some selected taxa, the suggested chronostratigraphic assignment is lower Berriasian for the Jaramillo Fm. A comparison of the microfloras from the Tithonian–Berriasian recorded in the Iberian Peninsula was carried out. The following observations can be concluded: 1) the change in the plant communities, already observed since the Late Jurassic onwards, became more pronounced between the Tithonian–Berriasian boundary and the late Berriasian; and 2) a noteworthy occurrence of some biostratigraphically important taxa, specifically for the Tithonian–Berriasian interval.
PB Cretaceous Research
SN 01956671
YR 2022
FD 2022-11
LK http://hdl.handle.net/11093/4117
UL http://hdl.handle.net/11093/4117
LA eng
NO Cretaceous Research, 139, 105300 (2022)
NO Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG
NO Ministerio de Economía y Competitividad | Ref. CGL2014-52670-P
DS Investigo
RD 13-dic-2024