Caribbean eocene volcanism and the extent of horizon a.
Layer A and its correlative layer A" in the Caribbean have been interpreted as chert layers produced by Eocene volcanism. Exposures of Eocene volcanic rocks in Puerto Rico and the Dominican Republic may represent layer A interbedded with coarser volcanic debris and preserved near early Tertiary volcanic centers.
Mattson
P H
PH
Pessagno
E A
EA