Museum für Naturkunde - Leibniz Institute for Research on Evolution and Biodiversity
Discussion
Started 15 April 2021
Age Interpolation of marker microfossils in new GPTS
How can we interpolate the age of marker microfossils according to new time scale.
Eg. if the previous research papers or standard zonation charts has used older timescale then how can we use that particular microfossil in the new time scale.
When we are working with multiple microfossils then we try to follow a single timescale (the most recent one) so this is required.
Popular replies (1)
With an example: in Agnini et al 2014, the LAD of Discoaster lodoensis was calibrated at 48.37Ma on the 1995 GPTS. It is thus between the bottom of C21n (47.906Ma) and the top of C22n (49.037Ma). On the 2020 GPTS, those chron boundaries are at 47.760 and 48.878Ma respectively. The mapped age of the LAD of Discoaster lodoensis on the 2020 GPTS is thus (by linear interpolation): 47.760 + (48.37-47.906)*(48.878-47.760)/(49.037-47.906) = 48.21867Ma. Note that we normally have a page on the NSB website allowing this kind of conversion but it is currently buggy since we updated the website last month and i m currently busy correcting it to allow this type of conversions again).
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All replies (3)
Museum für Naturkunde - Leibniz Institute for Research on Evolution and Biodiversity
With an example: in Agnini et al 2014, the LAD of Discoaster lodoensis was calibrated at 48.37Ma on the 1995 GPTS. It is thus between the bottom of C21n (47.906Ma) and the top of C22n (49.037Ma). On the 2020 GPTS, those chron boundaries are at 47.760 and 48.878Ma respectively. The mapped age of the LAD of Discoaster lodoensis on the 2020 GPTS is thus (by linear interpolation): 47.760 + (48.37-47.906)*(48.878-47.760)/(49.037-47.906) = 48.21867Ma. Note that we normally have a page on the NSB website allowing this kind of conversion but it is currently buggy since we updated the website last month and i m currently busy correcting it to allow this type of conversions again).
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formerly with Oil and Natural Gas Corporation Limited
Well explained by Johan Renaudie above. In fact changes in the absolute ages at few boundaries are so little that for all practical / industrial purposes the do not make great difference. However, establishing marker fossil ranges would be affected possibly in the local sedimentary Basin.
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University of Malaya
@Sudhir Shukla Sir, Yes i think that is the problem as we are working in Andaman Basin when we want to correlate the ages of different types of microfossils and determine the age of a particular outcrop there comes the problem. @Johan Renaudie has made it so clear for me and it is always better to use the recent GPTS for a new research article.
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