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

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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Ago and increased s 21 The Fossil Record, Part I in complexity and variety until the latest Pre-Cambrian times when metazoan faunas appeared. The criteria for the recognition of Pre-Cambrian fossils, or trace-fossils, are diverse; the rigorous position restated by Cloud (1965) is perhaps less in favour today " . . ". (A) BIOGENIC M A T E R I A L S IN A N C I E N T ROCKS The search in rocks and fossils of all ages for substances which were derived from, or contributed to, life processes has recently been proceeding at an accelerating rate.

Volcanoes and world climate. Scient. Am. April, 3-5. WHITTARD,W. F. 1953. The enigma of the earliest fossils. Proc. Bristol Nat. Soc. 25, 289-304. WILSON, A. E. 1957. Life in the Proterozoic. In GILL, J. E. ) The Proterozoic in Canada. Special Publication no. 2, Royal Society of Canada, pp. 18-27. Manuscript submitted June 1966. J. w . S. Department of Geology, The University, Bristol 8. 35 The significance of certain trace-fossil ranges ROLAND COLDRIN6 Tgnc~-fossils (ichnofossils; tracks, trails and burrows) are an important constituent of the fossil record, and although their stratigraphical value is limited, they provide a valuable clue to the environments colonized by different groups of organisms and an indication of the various activity patterns formed by benthonic animals.

Y. (F) TRACE-FOSSILS Pre-Cambrian trace-fossils, resulting from the activities of organisms, seem to be found in rocks deposited in the later part of Pre-Cambrian times and most frequently in strata which are stratigraphically not far below the base of the Cambrian System (however that may be defined). Further critical study of their palaeontological and stratigraphical significance is required but the impression certainly arises from a general view of the record that there was a striking increase in tracks, trails and other traces of fossils just before the Cambrian period, that these are of metazoan benthonic life, and that earlier Pre-Cambrian life was planktonic (Seilacher 1956).

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