conodonts of khoshyeilagh formation, the most complete section of devonian rocks in the alborz mountains, northern iran, has been studied, and subspecies of the genera icriodus, bipennatus, polygnathus, pelekysgnathus, ancyrodella, palmatolepis, bispathodus, scaphignathus, clydagnathus, gnathodus, scaliognathus and dollymae have been obtained from the studied section. the faunas indicate an eif...

A new conodont species, Icriodus marieae, is described from pelagic limestone beds of the Carnic Alps (Austria). Specimens are obtained from the upper part of the Valentin Formation (Central Carnic Alps) and range from the latest Eifelian to middle Givetian. Significantly differing from other icriodontid conodonts is that the icriodontan element of the new species develops only three denticles ...

Exceptionally well-preserved organic remains of thecamoebians (testate amoebae) were preserved in marine sediments that straddle the greatest extinction event in the Phanerozoic: the Permian-Triassic Boundary. Outcrops from the Late Permian Zewan Formation and the Early Triassic Khunamuh Formation are represented by a complete sedimentary sequence at the Guryul Ravine Section in Kashmir, India,...

of the open ocean as the source of the material as in the case of the Sargasso-sea faunas. Such is the Genessee shale which like the Genundewa limestone contains in the abundant Styliolinas a typical planktonic element, the Genundewa limestone representing a Devonian pteropod-ooze. The widely extending Chatanooga shale is characterized by the conodonts, now recognized as the teeth of cyclostome...

Extinctions within major pelagic groups (e.g., radiolarians and conodonts) occurred in a stepwise fashion during the last 15 Myr of the Triassic. Although a marked decline in the diversity of pelagic faunas began at the end of the middle Norian, the cause of the middle Norian extinction is uncertain. Here we show a possible link between the end-middle Norian radiolarian extinction and a bolide ...