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Cyclicargolithus abisectus

Edited by Jeremy Young on Wed, 09/03/2011 - 17:07

Cyclicargolithus abisectus (Muller, 1970) Wise, 1973 [Coccolithus?]

Description: Coccoliths large (>11µm), usually sub-circular. 

Remarks:
The distinction from C. floridanus on size is arbitrary, but of
some biostratigraphic use (Olafsson,
1992)

Original description:

Cat010009 copy.jpgCat010010 copy.jpg

3-6abisectus.JPG

Geological Time Data
Geological Time Periods: 
NN 1
Paleogene
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.

Comments

Mon, 03/05/2010 - 00:15 — Richdenne
Richdenne's picture

Differentiation of C. abisectus

I've always felt that the thicker collar and somewhat more elliptical opening of C. abisectus was a better way to differentiate it from C. floridanus than size. There is a large form (>13 microns) with a very thick collar that is found in frequent abundances within the lower NP25 that makes a relatively good assemblage marker (see photo of large Cyclicargolithus abisectus in the Noelaerhabdaceae gallery).

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