Introduction

The selection for this section of taxa and their illustrations for the interval uppermost Early Eocene to Middle Miocene is largely from the three publications by Cushman & Renz (1947b, 1948) and Cushman & Stainforth (1945). In 1943,1944, and 1945 H. H. Renz and R. M. Stainforth, both at the time paleontologists with Trinidad Leaseholds Ltd in Pointe-à-Pierre, Trinidad, West Indies, issued detailed company reports on the occurrence and distribution of Trinidad foraminifera from Early Cretaceous to Recent. Based on the foraminifera the formations were either subdivided by zonal schemes as in the San Fernando and Cipero formations, or into a combination of members/lentils and zones, as in the Ste. Croix and Brasso formations. The Eocene Navet Formation was subdivided by Cushman & Renz (1948) into seven marl members.

These reports contain detailed maps and sections of the type localities for each of the zones, members and lentils, data on lithology, age, thickness and strati-graphic relations. For each of the units the foraminiferal content was listed and documented in assemblage slides arranged by genera and species, applying a number system to the latter. These detailed reports by H. H. Renz and R. M. Stainforth formed the base for their joint publications with J. A. Cushman.

The foraminiferal fauna of the Cipero Formation published by Cushman & Stainforth (1945) was at the time regarded as wholly belonging to the Oligocene. It was subdivided from bottom to top into the three zones Globigerina concinna (now Globigerina ciperoensis ciperoensis) Zone, Globigerinatella insueta Zone and Globorotalia fohsi Zone.