K/T Poster project

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This collage of images shows various outputs produced using CHRONOS’s data and tools. The ‘How to?’ of each component is described in the online tutorials.

The results show a species richness (or diversity) curve (in red) for planktic foraminifera the last 125 Ma at one million year intervals constructed using CHRONOS’s data search application (QDF) and Sepkoski’s approach to calculating taxon diversity. The values have not been corrected for the different sample sizes but a curve (blue) shows the total number of sections available in Neptune for each million-year interval. Although biased by the uneven distribution of sections through time, the curve shows a rapid increase in species abundance throughout the Cretaceous, the abrupt decline at the K/T boundary and the post-extinction recovery. We are currently working on the code to implement a subsampling method (rarefaction) similar to what is used by the Paleobiology Database.

The data available from the hosted Neptune database that currently contains paleobiological data from 310 DSDP and ODP holes. The samples in each Neptune hole were age-calibrated using the Age Depth Plotting tool (ADPApp – a Java application). The age/depth plot of Leg 74, Hole 525A is shown.

CHRONOS’s TIS (Timescale Information System) application was used to render the time scale, plot the Sr/Sr data for the late Cretaceous from leg 192, hole 1183A and the age range occurrence of six key K/T boundary taxa from leg 74, hole 525A. Images of one of the taxa as extracted from the Mesozoic planktic foraminifera taxonomic dictionary queried through the TIS, is also shown.
Three diagrams show an example of a graphic CONOP 9 output using species of the Mesozoic genus Globotruncana recorded in 126 sections extracted simultaneously from three federated databases, Neptune, ODP Janus database, and PaleoStrat.
CHRONOS http://www.chronos.org