The significance of the graptoloid Amphigraptus divergens from the (mid-Rawtheyan) type section of the Ashgill Series, Ordovician

Geological Magazine

Volumn 141, Issue 6, 2004, Pages 735-738

  Rickards, R B ^a  

^a UNIVERSITY OF CAMBRIDGE   (United Kingdom)

Author keywords

Ashgill Series; Graptolites; Ordovician

Indexed keywords

ASHGILL SERIES; BRITAIN; EVOLUTIONARY ORIGIN; GRAPTOLITES; ORDOVICIAN;

BIOZONATION; GRAPTOLITE; ORDOVICIAN; TAXONOMY;

AMPHIGRAPTUS DIVERGENS;

EID: 12444257408     PISSN: 00167568     EISSN: None     Source Type: Journal    
DOI: 10.1017/S0016756804009938     Document Type: Article

References (19)

1. Bronn, H. G. 1849. Index Palaeontologicus B, Enumerator palaeontologicus. Stuttgart: E. Schweizerbartsche. 980 pp.
2. Bulman, O. M. B. 1970. Graptolithina with sections on Enteropneusta and Pterobranchia. Part V, 2nd ed. 163 pp. In Treatise on Invertebrate Paleontology (ed. C. Teichert). Geological Society of America & University of Kansas Press.
3. Elles, G. L. 1925. Sedgwick Museum Notes. The characteristic Assemblages of the Graptolite Zones of the British Isles. Geological Magazine 62, 337-47.
4. Elles, G. L. & Wood, E. M. R. 1901-18. Monograph of British Graptolites. Palaeontographical Society (Monograph), i-clxxi, a-m, 1-536.
5. Hall, J. 1859a. Descriptions and figures of the organic remains of the Lower Helderberg group and the Oriskany Sandstone. Palaeontology of New York 3, 1-533, Albany.
6. Hall, J. 1859b. Notes upon the genus Graptolithus. Annual Reports of the New York State Cabinet, Natural History 12, 45-58.
7. Hall, J. 1865. Graptolites of the Quebec Group. Geological Survey of Canada, Organic Remains. Decade 2, 1-151.
8. Hall, J. 1868. Introduction to the study of the Graptolitidae. Annual Reports of the New York State Cabinet, Natural History 20, 169-240.
9. Ingham, J. K. 1966. The Ordovician Rocks in the Cautley and Dent Districts of Westmoreland and Yorkshire. Proceedings of the Yorkshire Geological Society 35, 455-504.
10. Lapworth, C. 1873. On an improved classification of the Rhabdopora. Geological Magazine 10, 500-4, 555-60.
11. Lapworth, C. 1875. In Hopkinson, J. & Lapworth, C. Descriptions of graptolites of the Arenig and Llandeilo rocks of St. Davids. Quarterly Journal of the Geological Society of London 31, 631-72.
12. Lapworth, C. 1876. The Silurian System in the south of Scotland. In Catalogue of Western Scottish Fossils (eds J. Armstrong, J. Young and D. Robertson), pp. 1-28. Glasgow: Blackie for the British Association for the Advancement of Science.
13. Miller, S. A. 1889. North American Geology and Paleontology. Cincinnati, Ohio: Western Methodist Book Concern, 664 pp.
14. Rickards, R. B. 2002. The graptolitic age of the type Ashgill Series (Ordovician) Cumbria, U.K. Proceedings of the Yorkshire Geological Society 54, 1-16.
15. Ruedemann, R. 1908. Graptolites of New York, pt. II. Graptolites of the higher beds. New York State Museum, Memoir 11, pp. 457-583.
16. Ruedemann, R. 1947. Graptolites of North America. Geological Society of America Memoir no. 19, 652 pp.
17. Taylor, L., Zalasciewicz, J., Rushton, A. W. A., Loydell, D. & Rickards, R. B. (in press) A New Ordovician and Silurian Graptolite Range Chart for the British Isles. Geological Society Special Publication no. 230, 345 pp.
18. Walters, M. 1977. Middle and Upper Ordovician graptolites from the St. Lawrence lowlands, Quebec, Canada. Canadian Journal of Earth Sciences 14, 932-52.
19. Williams, S. H. 1982. Upper Ordovician graptolites from the top Lower Hartfell Shale Formation (D. clingani and P. linearis zones) near Moffat, southern Scotland. Transactions of the Royal Society of Edinburgh; Earth Sciences 72, 229-55.