Abstract The Schrattenkalk Formation represents a complete succession of Lower Cretaceous shallow-water carbonate platform series cropping out in the Alpstein massif north-eastern Switzerland. is traditionally divided into two sedimentary units, “Lower” and “Upper” Schrattenkalk, separated by more marly Rawil Member. habitually dated to late Barremian, while Member are early Aptian. New field o...

In 2013, Andra (French National Radioactive Waste Management Agency) drilled boreholes to the south-east of Paris Basin, characterise Aptian and Albian clayey formations, including ‘Argiles à Plicatules’ Formation dated as early Aptian. One these intersected this formation with an excellent recovery allowing detailed biostratigraphy (ammonites), sedimentology, clay mineralogy, isotope geochemis...

Two new conifer morphospecies represented by a secondary xylem are reported for the Lower Cretaceous Baqueró Group (Santa Cruz Province, Argentina). Agathoxylon sp. is characterized by poorly defined growth rings, predominantly uniseriate pitting in the radial wall of the tracheids, cross fields with 1-6 pits and uniseriate rays. These features are shared with the leafy branches described for t...

An original and detailed study focusing the petrography of evaporites from the Late Aptian deposits exposed in the eastern and southern São Luís-Grajaú Basin is presented herein, with the attempt of distinguishing between primary and secondary evaporites, and reconstructing their post-depositional evolution. Seven evaporites phases were recognized: 1. chevron gypsum; 2. nodular to lensoidal gyp...