14. 
MICROPALEONTOLOGY, STRATIGRAPHY, AND 
PLEISTOCENE CLIMATES 
For the micropaleontological analyses the best species of pelagic 
foraminifera for a stratigraphical correlation were selected. These were 
found to be; Globorotalia menardii, G. men, var. tumida, G, men, var. 
flexuosa, G. pencticulata puncticulata, G, puncticuiata hirsuta, G. 
truncatulinoides, G. scitula; Globigerina inflata, G. bulloides, G. pachy- 
G. conglobatus; Globigerinella aequilateralis, Orbuiina universa, Pullen- 
iatina obliquloculata, Sphaeroidinella dehiscens. 
It has been found that foraminifera other than those listed, and 
radiolaria, pteropods, and coccoliths are so far not suitable for a quick 
micropaleontological analysis of the cores. 
It is evident that any faunal characteristic which marks a thin 
layer of sediment in such a way that it can be recognized in a number of 
adjacent cores may be of use in comparing rates of deposition from place 
to place. Furthermore, if the layer is not too old, a single radio-carbon 
date may be used to give absolute rates of deposition in a widely scattered 
suite of cores. With this object the coiling directions of several species 
of Globorotalia were studied in dees. It was found that layers only a few 
centimeters thick are marked by abrupt changes in ratio of right coiling 
1. Bolli, H., The direction of coiling in the evolution of some Globoro- 
taliidae, Cushman Found, Foram. Res., Vol. 1, parts 3-4, pp. 82-89, 
1950. 
