growth increments in teeth of diictodon (therapsida)

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ID: 224651
1991
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Abstract
Growth increments circa 0.02 mm in width have been observed in sectioned tusks of Diictodon from the Late Permian lower Beaufort succession of the South African Karoo, dated between about 260 and 245 million years ago. Mean growth increments show a decline from relatively high values in the Tropidostoma/Endothiodon Assemblage Zone, to lower values in the Aulacephalodon/Cistecephaluszone, declining still further in the Dicynodon lacerficeps/Whaitsia zone at the end of the Permian. These changes coincide with gradual changes in carbon isotope ratios measured from Diictodon tooth apatite. It is suggested that the decline in growth increments is related to environmental changes associated with a decline in primary production which contributed to the decline in abundance and ultimate extinction of Diictodon.
Reference Key
thackeray1991koedoe:growth Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;J. Francis Thackeray
Journal current pharmaceutical design
Year 1991
DOI
10.4102/koedoe.v34i1.408
URL
https://koedoe.co.za/index.php/koedoe/article/view/408
Keywords
general geographical distribution including nature conservation palaeoclimate

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