1,721,139 research outputs found
The Silurian of Sardinia: introduction to the field trip
No full textThe general features of the Silurian of Sardinia are briefly outlined, with special respect to the two main facies suites exposed in the southeastern and southwestern parts of theisland, respectively. An integrated biostratigraphical scheme with graptolite, conodont and chitinozoan zonations applied in the island is presented
Biostratigrafia a conodonti del margine settentrionale del Gondwana (Ordoviciano sup.-Ashgill)
No full text
Microbiofacies and constituent analysis of Upper Silurian-Lowermost Devonian limestones from Southwestern Sardinia
No full textMain microbiofacies of the Silurian of Sardinia are described and illustrated
Ooidal ironstones and laminated ferruginous deposits from the Silurian of the Carnic Alps, Austria
No full textDistinct ooidal horizons and diverse laminated ferruginous structures are reported from the Silurian of the Carinthian Carnic Alps. The former were recovered in forms of centimetric horizons at the base of a single section (Rauchkofel Boden). The Carnic Alps reports are the only record in the Silurian from the European sector of the Northern Gondwana margin. Ooids consist mostly of chamosite, goethite and mixtures thereof with subordinate amounts of apatite. Laminated ferruginous deposits are present in themajority of the investigated sections and are represented either by rare “stromatolite-like” structures or by abundant banded iron-rich fossil coatings, mostly around trilobites and cephalopods. Both types are composed of calcareous laminae alternating with layers rich in iron silicates or oxides (chamosite, goethite, and magnetite). All these deposits can tentatively be regarded as microbial. Magnetite coatings revealed peculiar filaments of possible organic nature, closely resembling fungal hyphae
Upper Ordovician conodonts from the Prague Basin (Bohemia)
No full textLate Ordovician conodonts from the Prague Basin are described and illustrated for the first time
- …
