Abstract
SUMMARY The Rawtheyan Stage of the type Ashgill Series, in Westerdale, Cumbria, is shown to be of linearis Biozone age, largely on the basis of extensive new graptolite collections. This is the only reliable graptolite dating of the type Ashgill, although it is possible that the underlying Cautleyan Stage is also of linearis Biozone age. There is no direct evidence for the complanatus, anceps, extraordinarius and persculptus biozones, although these could equate roughly with the top of Ingham’s (1966) zone 7 and his zone 8, the latter embracing the Ashgill (Shales) Formation. A total of 26 graptolite taxa have been identified in the type Ashgill Series, from 26 localities, many of them new. Dicellograptus praeanceps sp. nov. is described.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
