Saturday, May 17, 2014

A late Eocene Turritella

This fourth species in the series of selected species of Turritella to show how the morphology (shape) of this genus changes over time. This is how field geologists can readily decipher the geologic age of a bed containing a particular species of Turritella. The detailed reasons for the change in morphology are rarely understood, but they are undoubtedly related to changes in micro-environments, as well as to the possibility of genetic mutations. 

height 46 mm
Turritella uvasana sargeanti Anderson and Hanna, 1925

AGE RANGE: Cenozoic (late Eocene = about 38 million years ago).

GEOGRAPHIC RANGE: Southern California.

REMARKS: This species can be variable in its morphology.


1 comment:

  1. Finally a paleo blog site by a world class expert on his subject! Congratulations Richard!

    I'll look forward to some Late Cretaceous posts now.