Some of the oldest traces for planktonic lifestyle have been reported in ca. 3.4 billion years old silicified sediments from Strelley Pool Formation Western Australia. Observation flange appendages suggests that Archean life motility was passive and driven by drifting microorganisms their surrounding environment. Until now, active are 2.1 old. Whether or not already existed during eon remains a...

The Lower Cretaceous Carbonate deposits of the Dariyan Formation of the HighZagros Belt are mainly composed of thick to medium bedded limestone. These depositscontain abundant and diversified benthic foraminifera which have been recovered fromcarbonate rocks. A rich assemblage of microfossils with characteristic: Palorbitolinalenticularis (Blumenbach), Mesorbitolina subconcava (Leymerie), Mesor...

Abstract Fossil-informed molecular phylogenies have emerged as the most powerful tool for correlating biotic evolution and Earth history. The accuracy of these trees, however, depends on completeness fossil sampling. For organismal clades, available record is insufficiently sampled. This especially true groups with a multi-element skeleton, such echinoderms vertebrates, where sampling efforts f...