Rare and problematical bohemograptid graptoloids from the leintwardinensis Zone (basal Ludfordian, Silurian) of the northern Howgill Fells, Cumbria

Rickards, R. B. (2012) Rare and problematical bohemograptid graptoloids from the leintwardinensis Zone (basal Ludfordian, Silurian) of the northern Howgill Fells, Cumbria. Proceedings of the Yorkshire Geological Society, 59 (1). pp. 21-24. ISSN 0044-0604, 2041-4811 DOI 10.1144/pygs.59.1.275

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Official URL: http://pygs.lyellcollection.org/content/59/1/21

Abstract

Two new unusually gracile bohemograptid species are recorded from the leintwardinensis Zone of the UK, and are assessed as part of the global Bohemograptus Proliferation Zone (BPZ). The ‘robust’ form, B. woodcocki sp. nov., is a possible ancestor of Egregiograptus Rickards & Wright, 1997; it probably derived indirectly from Bohemograptus bohemicus tenuis (Bouček, 1936) via B. bohemicus sensu lato of Holland & Palmer (1974) from the incipiens Zone. The more slender form, B. stonei sp. nov., is a possible ancestor of Neolobograptus Urbanek, 1970, and probably arose directly from B. b. tenuis in the leintwardinensis Zone.

Item Type: Article
Uncontrolled Keywords: 2012AREP; IA64;
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Journal or Publication Title: Proceedings of the Yorkshire Geological Society
Volume: 59
Page Range: pp. 21-24
Identification Number: 10.1144/pygs.59.1.275
Depositing User: Sarah Humbert
Date Deposited: 03 Aug 2012 11:14
Last Modified: 23 Jul 2013 10:04
URI: http://eprints.esc.cam.ac.uk/id/eprint/2573

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