FILICOPSIDA is a predominant group of the Early Cretaceous floras of Northeast China, whichapproximates 100 species and accounts for more than one third of the
SINCE Alvarez first used iridium anomaly to explain the Cretaceous-Tertiary impact eventand mass extinction, more than 70 sites of iridium-nickel anomalies hav
THE oceanic lithosphere is composed of oceanic crust and upper mantle. It is widely accepted that the Troodos ophiolitic section represents the oceanic crust s