Previously considered an actinopterygian or an osteichthyan incertae sedis, the Devonian (Givetian-Frasnian) Holopterygius nudus is reinterpreted as a coelacanth. This genus is among the oldest coelacanths known from articulated remains, but its eel-like morphology marks a considerable departure from the conventional coelacanth body plan. A cladistic analysis places Holopterygius as the sister ...

Research subject. Ostracods and Givetian-Frasnian boundary deposits of the Timan-North Urals Region. Materials methods. The work was based on results studying ostracods from stratotype sections Southern Timan, which are considered referential for regional global correlations. analysis distribution intervals most significant taxa previous studies, both published archival materials Timan-Urals we...

Tabulates, an extinct Palaeozoic group of corals, developed diverse colony morphologies during the Silurian to Devonian peak reef development. Coralliths, or circumrotatory colonies, are passively motile coral colonies constantly overturned by wave action currents. Such overturning allows tissue growth on all sides colony. They among most rarely reported forms. Recent corallith-forming scleract...

Four TOC-rich shale intervals spanning the Frasnian–Famennian (F–F) boundary were recovered in a drillcore (West Valley NX-1) from western New York (USA) and radiometrically dated using Re–Os. Two of the black shale intervals (WVC785 from ∼2.9 m below, and WVC754 from ∼6.4 m above the F–F boundary, respectively) yielded statistically overlapping ages with uncertainties of b1.1%. An interpolated...

Midto Upper Devonian strata of the lower Witteberg Group in the Cape Fold Belt of South Africa comprise three principal facies deposited in the shoreface and contiguous inner shelfalong a storm-dominated coastal zone. Weakly burrowed mudrock with variable minor proportions of wave-rippled sandstone (linsen, flasers, hummocky cross stratification [HCSJ) (facies 1) accumulated in the inner shelf ...