For this purpose, the Upper Sinemurian, Pliensbachian and Lower Toarcian (Lower Jurassic) deposits of the Asturian Basin in northern Spain, including more than 100 m thick succession containing organic-rich and black shale deposits, have been studied.
1), which shows a succession of Upper Sinemurian, Pliensbachian and Lower Toarcian (Lower Jurassic) deposits, offers an excellent opportunity to asses this statement, as several climatic oscillations have been identified (Gomez et al, 2016) and the record of the TOC content of the succession reveals the presence of several intervals of organic-rich and black shale deposits.
Latrille C, Elsass F, van Oort F, Denaix L (2001) Physical speciation of trace metals in Fe-Mn concretions from a rendzic lithosol developed on Sinemurian
(Liassic [alfa]-[beta]), Lower Jurassic.
It was quarried from selected carbonate beds within the Lower Jurassic, Sinemurian
Stage, Coma Formation (Cassinis, 1968).
This formation is one of two comprising the Laberge group of rocks, which are a northwest-trending linear belt of Early Sinemurian
to Late Pliensbachian muddy turbidites, graywackes and conglomerates (Johannson, 1993).
In the adjacent Betic basins, the Mediterranean affinity is evidenced since the late Sinemurian
up to the early Toarcian (Baeza-Carratola and Garcia Joral, 2012; Baeza-Carratola, 2013).
A total of 30 m were logged (interrupted only by one small inaccessible sector), belonging to the Oxynotum-Raricostatum Zone, Late Sinemurian (Duarte et al.
The Maximum Flooding Interval (MFI) of the upper Sinemurian T-R facies cycle occurs around the 30 m of the Polvoeira section, where the high GR values (180 to 190 cps) coincide with high Th and K content, indicating maximum condensation (minimum sand input) (Fig.
1972) suggest a Sinemurian
to Pliensbachian age for these limestones.
sequence is followed by a thin limestone succession (90 m thick) with subordinate ferruginous marls (Fig.
One sample from the Upper Sinemurian
of Aguilar de Campoo was nearly barren with benthic foraminifers (64).