Chalk Biozone 4 - Litosphaeridium siphoniphorum: Difference between revisions

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Created page with " '''Age:''' Earliest Turonian. '''Macrofaunal correlation''': The ''W. devonense ''and'' F. catinus'' zones (= the ''W. coloradoense'' Zone. '''Definition:''' The interv..."
 
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'''Age:'''  Earliest Turonian.
'''Age:'''  Earliest Turonian.


Latest revision as of 15:32, 27 September 2013

Age: Earliest Turonian.

Macrofaunal correlation: The W. devonense and F. catinus zones (= the W. coloradoense Zone.

Definition: The interval between the LAD of Wrevittia cassidata to the LAD of Litosphaeridium siphoniphorum.

Comments: The distinctive species Litosphaeridium siphoniphorum apparently became extinct close to the Cenomanian-Turonian boundary (Costa & Davey, 1992; Foucher & Monteil, 1998). An alternative marker for the top of this Biozone is the FAD of Florentinia clavigera (see Foucher & Monteil, 1998).

Lithostratigraphical correlation: The lower Holywell Nodular Chalk Formation (Southern Province), the Welton Chalk Formation (Northern Province) and the Herring Formation (North Sea).

Retrieved from "http://earthwise-staging.bgs.ac.uk/index.php?title=Chalk_Biozone_4_-_Litosphaeridium_siphoniphorum&oldid=1548"