Home › nanno-taxonomy › Nannoliths › Sphenolithaceae › Sphenolithus › S. abies group

S. abies group

Sun, 30/03/2008 - 19:13 — Jeremy Young
Citation: 
Sphenolithus abies group

Description: Sphenoliths without prominent apical spines.


Species included:

Typical specimens Outline description Range
6-2abies.JPG abies.jpg S. abies - cuspate outline, with apical elements elongated into compound spine caNN7 - NN15
6-5conicus.JPGconicus.jpg S. conicus - with small apical spine Oligocene - NN3
6-15disbelemnos.JPGdisbelemnos.jpg S.disbelemnos -similar to S. belemnos but with very small apical spine NN2-3
6-9dissilimis.JPGdissimilis.jpg S. dissimilis - similar to S. moriformis but with apical cycle of elements extended to form circlet of spines Oligocene - NN3
6-6moriformis.JPGmoriformis_(well_preserved).jpg S. moriformis - beehive shaped Eocene - NN10

Species in this group are poorly defined and of very limited biostratigraphic value. A number of additional species have been described from the Early Miocene, as reviewed by Maiorano & Monechi (1998):

  • Sphenolithus cometa de Kaenel & Villa 1996
  • Sphenolithus milanetti Maiorano and Monechi, 1998
  • Sphenolithus multispinatus Maiorano and Monechi, 1997
  • Sphenolithus procerus Maiorano and Monechi, 1997
  • Sphenolithus tintinnabulum Maiorano and Monechi, 1997

 

Post new comment

The content of this field is kept private and will not be shown publicly.
Scratchpads developed and conceived by: Vince Smith, Simon Rycroft & Dave Roberts