STUDIES m FORAMINIFERA 



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GLOBIGERINA | 



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6. CF. TRILOCULARIS D'ORBISNY 



e. YENEZUELANA HEDBERS 



e. PARYA BOLLI 



e. AMPLIAPERTURA BOLLI 



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Figure 26. — Distribution of planlitonic Foraminifera in the Eocene Navet and San Fernando formations of Trinidad, B.W.I. 



fauna was found reworked in the upper Oligocene to 

 lower Miocene Nariva formation in the cutting west 

 of tank 127, situated south of The Avenue and 850 

 feet west of its junction with Bon Accord Road, Pointe- 

 a-Pierre. Many of the specimens illustrated in this 

 paper are from this block, which is no longer existant. 

 (Sample Hg 8581, TTOC 215782). 



Lithology: Light grey, yellowish weathering, soft 

 marl. 



Remarks: Porticulasphaera mexicana (Cushman) is 

 restricted to this zone. Glohorotaloides suteri Bolli and 

 Globigerina venezuelana Hedberg occur for the first time, 

 while Oloborotalia spinrdosa Cushman, Globorotalia spi- 

 nvloinflata (Bandy), Truncoroto hides topUensis (Cush- 

 man), and Olobigerapsis kugleri Bolli, Loeblich, and 

 Tappan become extinct at the top of the zone. 



Truncorotaloides rohri Zone 



Type locality: Outcrop (see text-fig. 25) in Navet 

 River, Central Range (coordinates N:3 16640 links; 

 E:502260 links), type sample K 8834 (TTOC 177773), 

 outcrop K 8833 contains an identical fauna. 



Lithology: Yellowish grey, soft marl. 



Remarks: The Truncorotaloides rohri zone is charac- 

 terized by the persistence of the spinose Truncorotaloides 

 rohri Bronnimann and Bermudez group and small speci- 

 mens of the strongly compressed Oloborotalia lehneri 

 Cushman and Jarvis. In contrast to Olobigerapsis in- 

 dex (Finlay) and Globigerinatheka barri Bronnimann, 

 these species do not continue into the overlying Olobi- 

 gerapsis simiinvoluta zone. Olobigerina senni (Beck- 

 mann) also becomes extinct at the top of the zone. 



Globigerapsis semiinvoluta Zone 



Type locality: Hospital Hill marl, on east side of 

 road running from Kings Wharf, San Fernando, to 

 Point Bontour and the Cipero Coast, 235 feet north- 

 east from small bridge, 0.2 miles south of Kings Wharf 

 (coordinates N:234850 links; E:355650 Imks), type 

 sample Rz 75 (TTOC 23130) (Hospital Hill formation 

 of Cushman and Renz) . 



Cotype localities: In small ravine between mile- 

 posts 12}i and 12^ of the Brasso-Tamana Road and 

 the Navet River, Central Range (see text-fig. 25), 

 samples K 8829, 8830, 8832 (TTOC 177769, 177770, 

 177771). 



