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Early Telychian changes in graptoloid diversity and sea level

✍ Scribed by David K. Loydell

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
980 KB
Volume
29
Category
Article
ISSN
0072-1050

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✦ Synopsis

I t is suggested that a decrease in graptoloid diversity in the utilis Subzone (early Telychian) resulted from a eustatic fall in sea level induced by the spread of ice sheets from the highlands of central Gondwanaland. Major extinctions occurred within the retiolites and the genera Glyptograptus, Petalolithus, Stirnulograptus and Rastrites. The selectivity of the extinction may reflect the degree of environmental tolerance of the various graptoloid taxa, with those exhibiting water mass specificity most seriously affected. Lithological changes, here correlated with the glacial interval, are recognized from the Yangtze Platform of China and from Europe.

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