Panama and Trinidad Oligocene rocks
D. Graham Jenkins
A sample of the Gatuncillo Formation in Quebrancha syncline, Panama, has been examined to determine its exact age in terms of ranges of planktonic Foraminifera. The well-preserved foraminiferal fauna indicates the age to be lower Oligocene, Globigerina sellii zone (equals G. oligocaenica zone). A portion of the type sample of the Globorotalia cerroazulensis zone (equals G. cocoensis zone) of the San Fernando Formation of Trinidad has been examined; finding of Cassigerinella chipolensis indicates post-Eocene, possibly Oligocene, age. Further work on separating the reworked Eocene Foraminifera from the autocthonous may yield more evidence of Oligocene age for the San Fernando.
This record provided courtesy of AGI/GeoRef.
