Geological Society Special Publication, 002 The Fossil by W. B. HARLAND C. H. HOLLAND M. R. HOUSE N. F. HUGHES A. B.

By W. B. HARLAND C. H. HOLLAND M. R. HOUSE N. F. HUGHES A. B. REYNOLDS M. j. S. RUDWICK G. E. SATTERTHWAITE L. B. H. TARLO E. C. WILLEY Ed Geological Society of London

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2. 3. 4. 5. Introduction Periods of diversification Periods of extinction Interpretation and causes References. 41 42 49 52 53 SUMMARY The problem of interpreting faunal fluctuations is reviewed and it is stressed that numerical abundance cannot be assessed, and morphological diversity only by comparing taxa or the subjective views of specialists. Comparisons at generic and higher taxon levels are made for the more common Palaeozoic fossil groups for appearance of new and extinction of old stocks.

Precambrian fossils from South Australia. Int. geol. Congr. 21, (12), 59-64. ~1962. Pre-Cambrian fossils. Biol. Rev. 37, 467-94. ~1963. Zur Kenntnis der Nama-fossilien stidwest-Afrikas. Annln naturh. Mus. Wien 66, 113-20. ~1965. Pre-Cambrian life--problems and perspectives. Proc. geol. Soc. Lond. no. 1626, 165-9. ~1966. Precambrian palaeontology. Earth-Sci. , Amsterdam 1, 29-50. GOLDRING,R. 1965. Sediments into rock. New Scient. 26, 863-5. I-IARLAND, W. B. & RtrDWlCI~, M. J. S. 1964. The great Infra-Cambrian ice age.

359) show that the main diversification at family level occurred between the Valentian and Gedinnian. This is broadly mirrored at generic level (Fig. 1). A. with the chaetetids, syringophyllids and auloporids, and almost all other families appearing before the close of the system, by which time they were world-wide in distribution.

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