The Devonian marks a critical stage in the early evolution of vertebrates: It opens with an unprecedented diversity of fishes and closes with the earliest evidence of limbed tetrapods. However, the latter part of the Devonian has also been characterized as a period of global biotic crisis marked by two large extinction pulses: a "Big Five" mass extinction event at the Frasnian-Famennian stage b...

The shutdown of carbonate productivity and its replacement by black shale deposition is often observed in the geological record yet factors driving such a change are debated. latest Famennian western Laurentia (present day North America) provides good example limestone – transition that roughly contemporaneous with global Hangenberg Crisis series environmental biotic changes associated widespre...

thirteen species of rugose corals, belonging to nine genera are described from the givetian and lower frasnian rocks of thekhoshyeilagh formation in the eastern alborz mountains (northeastern iran). glossophyllum ceratites (goldfuss), glossophyllum sp.,keriophyllum cf. maillieuxi (tsien), pseudozaphrentis sp., temnophyllum imperfectum coen-aubert, temnophyllum occidentale hilland jell, temnophy...

ABSTRACT Throughout the history of life on Earth, sedimentary environments have placed controls trajectory evolutionary innovations. To survive and thrive in newly colonized environments, organisms needed to develop novel behaviors: often evidenced rock record as architectural innovation diversification trace fossil morphology. This study focuses ichnological a response challenges presented by ...

Abstract The Devonian/Carboniferous Boundary (DCB) interval is associated with mass extinction, isotope excursions and a short glacial episode. This study investigates how boundary extinction environmental change expressed in the high-palaeolatitudinal record of Bolivian Altiplano (western Gondwana). A latest Devonian early Carboniferous section has been investigated using sedimentology, palyno...

In this paper, we show exceptional three-dimensionally preserved fossilized muscle tissues in 380-384 Myr old placoderm fish (Late Devonian), offering new morphological evidence supporting the hypothesis that placoderms are the sister group to all other gnathostomes. We describe the oldest soft tissue discovered in gnathostomes, which includes striated muscle fibres, circulatory and nerve tissu...

The sedimentology and palaeogeography of some Devonian sedimentary rocks in southwest Ireland