Introduction: Numerous studies at the Riotinto mining district have focused on astrobiology, sulfates and extremophilic microbial communities in the highly acidic aqueous environments [1-3]. In contrast, this project investigates past acidic alteration of nearby volcanic rocks. The present study covers a variety of alteration pathways that may influence volcanic protoliths, with the specific ty...

In the original description of the Devonian tetrapod Ventastega curonica Ahlberg et al., 1994, Oleg Lebedev mentioned his finding of an uncatalogued, presumed postorbital bone from the Late Devonian of Latvia in the collection of fossil fishes in the Museum f r Naturkunde in Berlin (Ahlberg et al. 1994). The bone bears a dermal sculpture of radially arranged ridges and furrows and is crossed by...

Abstract The Borkewehr section near Balve at the southeastern end of Remscheid-Altena Anticline is currently best and most complete Devonian/Carboniferous Boundary (DCB) succession Rhenish Massif, Germany. Based on a multidisciplinary approach, focusing refined conodont ammonoid biostratigraphy, microfacies analyses, sequence stratigraphy, carbon isotopes (C org C carb ), trace element geochemi...

F. G o n z á l e z e t a l . G e o l o g i c a A c t a , 1 3 ( 4 ) , 3 4 5 3 6 1 ( 2 0 1 5 ) D O I : 1 0 . 1 3 4 4 / G e o l o g i c a A c t a 2 0 1 5 . 1 3 . 4 . 7 Upper Frasnian palynomorphs from the Catalan Coastal Chain 346 defined as Les Vilelles unit in the Priorat Massif (Sáez, 1982), is confusing. On the basis of the palynological content of two closely collected shale samples, Colodrón...

Abstract Thirty Devonian-Carboniferous Boundary sections of the Rhenish Slate Mountains and adjacent subsurface areas are reviewed with respect to litho-, event, conodont, ammonoid, sequence, chemostratigraphy. In interval from base uppermost Famennian (Wocklum Beds, Wocklumian) middle Tournaisian (base Lower Alum Shale), 11 conodont 16 ammonoid (sub)zones distinguished. The terminology Hangenb...

Abstract The Hagen-Balve Reef is one of the largest Devonian carbonate complexes in Rhenish Massif exposed many former or active, economically significant quarries, especially Hönne Valley region at its eastern end. timing and patterns reef drowning, final extinction, middle Frasnian to Famennian post-reefal facies history, including details global Kellwasser Crisis, were studied based on two b...