Just out @ Palaeontologia Electronica
RNames, a stratigraphical database designed for the statistical analysis of fossil occurrences – the Ordovician diversification as a case study
Björn Kröger and Kari Lintulaakso
Names (rnames.luomus.fi/) is an open access relational database linking stratigraphic units with each other that are considered to be time-equivalent or time overlapping. RNames is also a tool to correlate among stratigraphic units. The structure of the database allows for a wide range of queries and applications. Currently three algorithms are available, which calculate a set of correlation tables with Ordovician stratigraphic units time binned into high-resolution chronostratigraphic slices (Global Ordovician Stages, Stage Slices, Time Slices).
The ease of availability of differently binned stratigraphic units and the potential to create new schemes are the main advantages and goals of RNames. Different time-binned stratigraphic units can be matched with other databases and allow for simultaneous up-to-date analyses of stratigraphically constrained estimates in various schemes. We exemplify these new possibilities with our compiled Ordovician data and analyse fossil collections of the Paleobiology Database based on the three different binning schemes. The presented diversity curves are the first sub-stage level, global, marine diversity curves for the Ordovician. A comparison among the curves reveals that differences in time slicing have a major effect on the shape of the curve. Despite uncertainties in Early and Late Ordovician diversities, our calculations confirm earlier estimates that Ordovician diversification climaxed globally during the Darriwilian stage.
READ IT HERE:
Latest posts by Lurdes Fonseca (see all)
- Just out | Europatitan eastwoodi, a new sauropod from the lower Cretaceous of Iberia in the initial radiation of somphospondylans in Laurasia @ PeerJ - June 27, 2017
- Just out | Revision of “Balaena” belgica reveals a new right whale species, the possible ancestry of the northern right whale, Eubalaena glacialis, and the ages of divergence for the living right whale species @ PeerJ - June 27, 2017
- Just out | Further study of Late Devonian seed plant Cosmosperma polyloba: its reconstruction and evolutionary significance @ BMC Evolutionary Biology - June 27, 2017