New uppermost Cambrian U-Pb date from Avalonian Wales and age of the Cambrian-Ordovician boundary

Geological Magazine

Volumn 135, Issue 3, 1998, Pages 303-309

  Davidek, K ^a   Landing, E ^b   Bowring, S A ^a   Westrop, S R ^c   Rushton, A W A ^d,e   Fortey, R A ^d   Adrain, J M ^d  

^a MASSACHUSETTS INSTITUTE OF TECHNOLOGY   (United States)

^b New York State Geological Survey   (United States)

^c BROCK UNIVERSITY   (Canada)

^d DEPARTMENT OF LIFE SCIENCES   (United Kingdom)

^e BRITISH GEOLOGICAL SURVEY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 11744254123     PISSN: 00167568     EISSN: None     Source Type: Journal    
DOI: 10.1017/S0016756898008711     Document Type: Article

References (38)

1. ALLEN, P. M., JACKSON, A. A. & RUSHTON, A. W. A. 1981. The stratigraphy of the Mawddach Group in the Cambrian succession of north Wales. Proceedings of the Yorkshire Geological Society 43, 295-329.
2. BARNES, C. R. 1988. The proposed Cambrian-Ordovician global boundary stratotype and point (GSSP) in western Newfoundland, Canada. Geological Magazine 125, 381-414.
3. BOWRING, S. A., GROTZINGER, J. P., ISACHSEN, C. E., KNOLL, A. H., PELECHATY, S. M. & KOLOSOV, P. 1993. Calibrating rates of Early Cambrian evolution. Science 261, 1293-8
4. BRUTON, D. L., KOCH, L. & REPETSKI, J. E. 1988. The Naersnes section, Oslo region, Norway: trilobite, graptolite and conodont fossils reviewed. Geological Magnazine 125, 451-5.
5. CHEN J.-Y QIAN Y.-Y., ZHANG J.-M., LIN Y.-K., YIN L.-M., WANG Z.-H., WANG Z.-Z., YANG J.-D. & WANG Y.-X. 1988. The recommended Cambrian-Ordovician global boundary stratotype of the Xiaoyangqiao section (Dayangcha, Jilin Province), China. Geological Magazine 125, 414-44.
6. ETHINGTON, R. L. & CLARK, D. L. 1971. Lower Ordovician conodonts in North America. In Symposium on conodont biostratigraphy (eds W. C. Sweet and S. M. Bergstrom), pp. 63-82. Geological Society of America, Memoir no. 127.
7. FEARNSIDES, W. G. 1910. The Tremadoc slates and associated rocks of south-east Carnarvonshire. Quarterly Journal of the Geological Society of London 66, 142-88.
8. FORTEY, R. A., BASSETT, M. G., HARPER, D. A. T., HUGHES, R. A., INGHAM, J. K., MOLYNEUX, S. G., OWEN, A. W., OWENS, R. M., RUSHTON, A. W. A. & SHELDON, P. 1991. Progress and problems in the selection of stratotypes for the bases of Ordovician series in the type area U.K. In Advances in Ordovician Geology (eds C. R. Barnes and S. H. Williams), pp. 5-25. Geological Survey of Canada Paper 90-9.
9. GROTZINGER, J. P., BOWRING, S. A., SAYLOR, B. Z. & KAUFMAN, A. J. 1995. Biostratigraphic and geochronologic constraints on early animal evolution. Science 270, 598-604.
10. HARLAND, W. B., ARMSTRONG, R. L., COX, A. V., CRAIG, L. E., SMITH, A. G. & SMITH, D. G. 1990. A geologic time scale 1989. Cambridge University Press.
11. HENNINGSMOEN, G. 1957. The trilobite family Olenidae. Skrifter Utgitt av det Norske Videnskaps-Akademi i Oslo. Matematisk-naturvidenskapelig klasse for 1957, no. 1.
12. HOWELLS, M. F. & SMITH, M. 1997. The geology of the country around Snowdon. Memoir of the British Geological Survey, Sheet 119 (England and Wales), x + 104 pp.
13. ISACHSEN, C. E., BOWRING, S. A., LANDING, E. & SAMSON, S. D. 1994. New constraint on the division of Cambrian time. Geology 22, 496-8.
14. JAGO, J. B. 1996. Some comments on the Cambrian time-scale in relation to recent radiometric dating of Australian Cambrian rocks. In II Field Conference of the Cambrian Stage Subdivision Working Groups. International Subcommission on Cambrian Stratigraphy. Field Trip Guide and Abstracts (eds E. Liñán, J. A. Gámez Vintaned and R. Gozolo), pp. 105-6. Universidad de Zaragoza, Zaragoza, Spain.
15. KOKELAAR, B. P., FITCH, F. J. & HOOKER, P. J. 1982. A new K-Ar age from uppermost Tremadoc rocks of North Wales, Geological Magazine 119, 207-11.
16. KROGH, T. E. 1982. Improved accuracy of U-Pb zircon ages by creation of more concordant systems using an air abrasion technique. Geochimica et Cosmochimica Acta 145, 637-49.
17. LANDING, E. 1984. Highgate gorge: Upper Cambrian and Lower Ordovician continental slope deposition and biostratigraphy, northeastern Vermont. Journal of Paleontology 57, 1149-87.
18. LANDING, E. 1992. Lower Cambrian of southeastern Newfoundland-Epeirogeny and Lazarus faunas, lithofacies-biofacies linkages, and the myth of a global biostratigraphy. In Origin and Early Evolution of the Metazoa (eds J.H. Lipps and P.W. Signor), pp. 283-309. New York: Plenum Press.
19. LANDING, E. 1993. Cambrian-Ordovician boundary in the Taconic allochthon, eastern New York, and its interregional correlation. Journal of Paleontology 67, 1-9.
20. LANDING, E. 1994. Precambrian-Cambrian boundary stratotype retified and a new perspective of Cambrian time. Geology 22, 179-82.
21. LANDING, E. 1996. Avalon: insular continent by the latest Precambrian. In Avalonian and Related Peri-Gondwanan Terranes of the Circum-North Atlantic (eds R. D.Nance and M. D. Thompson), pp. 29-63. Geological Society of America, Special Paper no. 304.
22. LANDING, E., BOWRING, S. A., DAVIDEK, K., WESTROP, S. R., GEYER, G. & HELDMAIER, W. In press. New U-Pb zircon dates from Avalon and Gondwana and duration of the Early Cambrain. Canadian Journal of Earth Sciences.
23. LANDING, E., BOWRING, S. A., FORTEY, R. A. & DAVIDEK, K. 1997. U-Pb zircon date from Avalonian Cape Breton Island and geochronologic calibration of the Early Ordovician. Canadian Journal of Earth Sciences 34, 724-30.
24. LANDING, E., TAYLOR, M. E. & ERDTMANN, B.-D. 1978. Correlation of the Cambrian-Ordivician boundary between the Acado-Baltic and North American faunal provincs. Geology 6, 75-8.
25. LAPWORTH, C. 1879 On the tripartite classification of the Lower Palaeozoic rocks. Geological Magazine Decade 2, 6, 1-15.
26. LUDWIG, K. R. 1989. Pb.dat: a computer program for processing raw Pb-U-Th isotope data. U.S. Geological Open-File Report 88-557.
27. LUDWIG, K. R. 1990. Isoplot: a plotting and regression program for radiometric isotope data. U.S. Geological Survery Open-File Report 90-91.
28. MILLER, J., TAYLOR, M. E., STITT, J. H., ETHINGTON, R. L., HINTZE, L. F. & TAYLOR, J. F. 1982. Potential Cambrian-Ordovician boundary sections in the western United States. In The Cambrian-Ordovician boundary: sections, fossil distributions, and correlations (eds M. G. Bassett and W. T. Dean), pp. 155-80. National Museum of Wales, Geology Series 3.
29. MOBERG, J. C. 1900. Nya bidrag till utredning af frǎen om gránsen mellan undersilur och kambrium. Geologiska Föreningens i Stockholm Förhandlingar 22, 523-40.
30. PERKINS, C. & WALSHE, J. L. 1993. Geochronology of the Mount Read volcanics, Tasmaina, Australia. Economic Geology 88, 1176-97.
31. RUSHTON, A. W. A. 1982. The biostratigraphy and correlation of the Merioneth-Tremadoc series boundary in North Wales. In The Cambrian-Ordivician boundary: sections, fossil distributions, and correlations (eds M. G. Bassett and W. T. Dean), pp. 41-59. National Museum of Wales, Geological Series 3, Cardiff.
32. SHERGOLD, J. H. 1995. Timescales I. Cambrian. Australian Geological Survey Organization Record 1995/30.
33. SKEVINGTON, D. 1966. The lower boundary of the Ordovician System. Norsk Geologisk Tidsskrift 46, 111-19.
34. STACEY, J. S. & KRAMERS, J. D. 1975. Approximation of terrestrial lend isotope evolution by a two stage model. Earth and Planetary Sciences Letters 26, 207-21.
35. STUBBLEFIELD, C. J. 1956. Cambrian palaeogeography in Britain In El Sistema Cambrico, su Paleogeografia y el Problema de su Base (ed. J. Rodgers), pp. 1-47. 20th International Geological Congress, Mexico City, Mexico.
36. THOMAS, A. T., OWENS, R. M. & RUSHTON, A. W. A. 1984. Trilobites in British stratigraphy. Geological Society of London, Special Report no. 16, 78 pp.
37. TUCKER, R. D. & MCKERROW, W. S. 1995. Early Paleozoic geochronology: a review in light of new U/Pb zircon ages from Newfoundland and Britain Canadian Journal of Earth Sciences 32, 368-79.
38. YOUNG, G. C. & LAURIE, J. R. (eds) 1996. An Australian phanerozoic Timescale. Melbourne: Oxford University press.