Stratigraphic distribution of Mesozoic Radiolaria from the Tethys

These data include the year 2000 version of the Jurassic/Cretaceous Radiolaira database compiled by Taniel Danielian (Universite Pierre et Marie Curie - Paris 6) and Ken Johnson (Scripps Institution of Oceanography). The data are extracted from an Tethyan radiolarian atlas and biozonation scheme (Baumgartner et al., 1995) compiled by the Jurassic-Cretaceous Working Group of the International Association of Radiolarian Palaeontologists (INTERRAD). For more information, see the publications office of the Universite de Lausanné. Analysis of these data are presented in Danielian and Johnson (in press).

The data are provided as three tables in CSV text format. The tables can be linked together to form a relational database. In each table, column names are included as the first row. Missing values are indicated by an "NA".

Sample information is stored in radsamples.csv. This table includes five columns:

  1. SampleNo - an unique index code
  2. SammpleName - the name of the sample
  3. Start - an estimated lower age limit of the sample interpolated from the timescales of Gradstein et al. (1995) for the Jurassic and Palfy et al. (2000) for the Cretaceous. Note that this is a negative number to assist in plotting (so that older samples have lower ages)
  4. End - the estimated upper age boundary interpolated for the sample
  5. Section - stratigraphic section from which the sample was obtained.
  6. Start.Odin - the lower age limit assigned to the sample using the time scale of Odin (1994)
  7. End.Odin - an upper age limit for each sample using the time scale of Odin (1994)
A list of species included in the samples can be found in radtaxa.csv. This table includes seven columns. The first column specifies a unique index number for each species, and the remaining columns include the name and systematics each species following the taxonomic framework of Dumitrica (1995).

Species occurrences within each sample are presented in radoccs.csv. This simple table includes two columns representing a concatenated list of species found in all samples. The first column includes a the taxon id code and the second column includes a sample id code. This table can be used to link the lists of taxa and samples.

This work was supported by the Royal Society of Edinburgh, and the United Kingdom Natural Environment Research Council. For more information, please contact Taniel Danelian or Ken Johnson

References:

  1. Baumgartner, P. O., L. O'Dogherty, S. Gorican, E. Urguhart, A. Pillevuit, and P. De Wever (eds.) 1995. , Middle Jurassic to lower Cretaceous Radiolaria of Tethys: Occurrences, Systamtics, Biochronology. Mémoires de Géologie (Lausanne), 23.
  2. Danielian, T. and K.G. Johnson. 2001. Patterns of biotic change in Middle Jurassic to Early Cretaceous Tethyan Radiolaria. Marine Micropaleontology 43: 239-260.
  3. Dumitrica, P. 1995. Systamic framework of Jurassic and Cretaceous Radiolaria. Pp. 19-35, in P.O. Baumgartner, L. O'Dogherty, S. Gorican, E. Urguhart, A. Pillevuit, and P. De Wever (eds.), Middle Jurassic to lower Cretaceous Radiolaria of Tethys: Occurrences, Systamtics, Biochronology. Mémoires de Géologie (Lausanne), 23.
  4. Gradstein, F.M., F.P., Agterberg, J.G. Ogg, J. Hardenbol, P. van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale, Pp. 95-126 in W.A. Berggren, D.V. Kent, M.-P. Aubry, and J. Hardenbol (eds.), Geochronology, time Sclaes and Global Stratigraphic Correlation. Society for Economic Mineralogy and Petrology Special Publication 54.
  5. Pálfy, J. P.L. Smith, J.K. Mortensen. 2000. A U-Pb and 40Ar/39Ar time scale for the Jurassic. Canadian Journal of Earth Sciences, 37: 923-944.
  6. Odin, G. S. 1994. Geological time scale. CR Acad. Sci. Paris 318(II): 59-71.

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Last modified 27 November 2001