for study of systematic and palaeoecology of mid-cretaceous oysters, the basab section, with 380 m thickness, west of kuhbanan, northwest of kerman, was measured and sampled. the section comprises a high diverse fauna (macro and microfossils), such as echinoids, bivalves, oysters, brachiopods, gastropods, corals, ammonites, foraminifers and ostracods. the fossils indicate late aptian- early cen...

The feeding larvae of many echinoids develop long postoral arms relative to body length when food is sparse but relatively short abundant, a response thought adaptively adjust capability. However, in an important recent study, Dendraster excentricus exhibited this food-conditioned plasticity only reared at high density typical laboratory cultures; lower more representative larval densities natu...

Rhodolith limestones occur in the upper part of Miocene infill Ronda Basin southern Spain. This basin was an embayment at margin Atlantic-linked Guadalquivir Basin, foreland Betic Cordillera. Messinian rhodolith crop out mesa Roman settlement Acinipo. They mostly consist trough cross-bedded rudstones, which change basinward to large-scale planar turn pass laterally and flat-bedded bryozoan ruds...

The present work focuses on palaeogeographic reconstruction of shallow-water carbonate deposition in the Outer Western Carpathian Tethys. Platform deposits are preserved only as a component turbidites and olistostromes, reconstructions these platforms based clastic material redistributed into slopes deep basins occurring among nappes. Similar were also Tethys margins. These performed using glob...

The echinoid fauna of Basab area (Aptian), northwest of Kerman, is fairly rich and diverse, represented by Pygaulidae, Acropeltidae, Emiratiidae, Toxasteridae, Holectypidae, Stomechinidae and Saleniidae. Four regular echinoid species, among which three are new, assigned to genus Tetragramma Agassiz, are described and illustrated in the present paper. The new species are Tetragramma basabensis, ...

Skeletal Mg/Ca in echinoderms is thought to be related ambient seawater Mg2+/Ca2+ ratio, which prompts the use of well-preserved fossil as paleoseawater proxies. Nonetheless, experimental studies testing effect ratio on echinoderm skeleton are limited one class, i.e., sea urchins (echinoids). Here, we investigated decreased skeletal composition (Mg/Ca ratio) a star Asterias rubens and brittle O...