17. 
The most important warm-water foraminifera are considered to 
be Globorotalia menardii, Globorotalia menardii var. flexuosa, Pullen- 
iatina obliquiloculata, and Sphaeroidinella dehiscens,. The most important 
cold-water foraminifera are considered to be Globorotalia scitula, 
Globigerina inflata, Globigerina bulloides, and Globigerina pachyderma, 
Figure 3 shows an example of a climatic curve, The core, 
A172-6, is from the crest of an eastern extension of the Beata Ridge in 
the Caribbean (14°59'N, 68°51'W), The length of the core is 9.35 m, 
and it is raised from a depth of 4160 m, (2275 fms,). The core is com- 
posed of uniform foraminiferal lutite and gives evidence of continuous 
normal deposition. This core and five others taken along a NW-SE profile 
from Hispaniola to a point north of Aruba show satisfactory correlation of 
climatic zones as deduced from the planktonic foraminifera, All pass 
through a zone of cool-water species corresponding to the Wisconsin 
glacial stage and into a zone containing a warm-water assemblage char- 
acterized by an abundance of Globorotalia menardii flexuosa (Koch), 
Evidently this corresponds to the Sangamon interglacial stage, Core 
Al172-6 alone is long enough to penetrate the Sangamon and enter a lower 
zone of cool-water species equivalent to the Illinoian glacial stage, 
Figures 4-A and B and 5-A and B show the correlation of the 
climatic curves as well as the correlation by coiling direction of Globoro- 
talia truncatulinoides, 
The four cores, Al180-72, A180-73, A180-74, A180-76, are taken 
near the equator about half way between Africa and South America, The 
