Additional observations on the evolution ofGryphaea
作者:
G. M. Philip,
期刊:
Geological Journal
(WILEY Available online 1967)
卷期:
Volume 5,
issue 2
页码: 329-338
ISSN:0072-1050
年代: 1967
DOI:10.1002/gj.3350050208
出版商: John Wiley&Sons Ltd
数据来源: WILEY
摘要:
AbstractThe view thatGryphaeabecame uncoiled as it evolved, recently presented by T. P. Burnaby (1965), is shown to be based on the incorrect use of a size dependent parameter. His result is largely the outcome of the larger mean size of the higher subzone specimens in Hallam's collections. When this size dependence is allowed for, then the results of Burnaby's method are similar to those given by Philip (1962). An additional treatment of Hallam's data is given and it is shown that the slopes of the reduced major axes fitted to Hallam's samples by Philip (1962) are an adequate index of the tightness of coiling (estimated by s/r) of the larger specimens in the samples. Limitations of Burnaby's method are briefly discussed.
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