158 



UNITED STATES NATIONAL MUSEUM BULLETIN 216 



LiTHOLOGY : Dark red, indiirated marl type with pale 

 green blotches. 



Remarks : At present the Globorotalm palmerae zone 

 is known in Trinidad only from the subsurface. The 

 planktonic fauna still shows strong afl&nities to the 

 underlying Globorotalia aragonensis zone (Ramdat 

 marl) of the Lizard Springs formation. Species that 

 make their first appearance are the zonal marker, Glo- 

 borotalia aspensis (Colom) and "Globigerinoides" hig- 

 ginsi Bolli, new species. 



Hantkenina aragonensis Zone 



Type locality: Friendship Quarry (Friendship 

 Quarry marl of Cushman and Eenz, 1948) near mUe- 

 post 5 of the Naparima-Mayaro Road between San 

 Fernando and Princes Town, in teak plantation, about 

 100 yards north of the road, south Trinidad (coordi- 

 nates N:241000 links; E:391900 Imks), type sample Rz 

 336 (TTOC 52767). 



CoTYPE localities: In small ravines between mile- 

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

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

 K 8775, 8781, 8783, 8820, 8823, 8911, 8914. 



LiTHOLOGY : White to light grey marl, in part in- 

 durated, chalklike. 



Remarks: The Friendship Quarry is maintained as 

 the type locality for the Hantkenina aragonensis zone 

 because of easy accessibility. The chalklike beds of 

 this locality contain a fairly poorly preserved foraminif- 

 eral fauna. Better faunas are found in the above 

 mentioned cotype localities in the Central Range. 



The Hantkenina aragonensis zone is characterized by 

 the first occuurrence of species of the genera Hantkenina 

 and Clavigerinella together with a number of other 

 planktonic species such as Globigerina howeri Bolli, new 

 species, Globorotalia bullbrooki Bolli, new species, G. 

 spinulosa Cushman, G. psevdomayeri BoUi, new species, 

 and G. spinuloinflata (Bandy). O. palmerae Cushman 

 and Bermudez, which is typical for the underlying 

 Globorotalia palmerae zone, has disappeared together 

 with a number of other species which persisted from the 

 Lizard Springs formation. 



A few outcrops (e. g., K 8817, 9002 of text-fig. 25) 

 were found to contain planktonic assemblages appar- 

 ently intermediate between those of the Globorotalia 

 palmerae and the Hantkenina aragonensis zones. In 

 this intermediate fauna Globorotalia palmerae is already 

 extinct while Hantkenina aragonensis Nuttall has not 

 yet appeared. Globorotalia psevdomayeri and smaU 

 Clavigerinella with club-shaped chambers are common. 

 The latter are probably ancestral forms of Clavigerinella 

 akersi Bolli, Loeblich, and Tappan. 



Globigerapsis kugleri Zone 



Type locality: Hindustan-Monkey Town Road 

 Junction, Dunmore HiQ area, south Trinidad (coordi- 

 nates N:229700 links; E:434500 Hnks), type sample 

 Rz 476 (TTOC 63610) (Dunmore Hill marl of Cushman 

 andRenz, 1948). 



Cotype localities: Nariva River, eastern Central 

 Range (coordmates N:314460 Hnks; E:486945 links), 

 samples Gimther 7865, 7200-7204 (Shell Trinidad) 

 (Nariva River marl of Cushman and Renz, 1948); in 

 small ravine between mileposts 12J^ and 12}^ of the 

 Brasso-Tamana Road and the Navet River, Central 

 Range (see text fig. 25), samples K 8821, 8824. 



Lithology: Light grey, yellowish weathering marl, 

 with indurated layers. 



Remarks: Globigerapsis index (Finlay), Globigerapsis 

 kugleri BoUi, Loeblich, and Tappan, Globorotalia lehneri 

 Cushman and Jarvis, and Globorotalia centralis Cush- 

 man and Bermudez make their first appearance in the 

 Globigerapsis kugleri zone, while several species, e. g., 

 Globorotalia aragonensis Nuttall, Globorotalia broeder- 

 manni Cushman and Bermudez, Globigerina boweri 

 Bolli, new species, and "Globigerinoides" higginsi Bolli, 

 new species, become extinct at the top of this zone. 



Globorotalia lehneri Zone 



Type locality: Outcrop on roadside near Fitt Trace 

 on the Cunapo Southern Road, near mUepost 17}^, 

 eastern Trmidad (coordmates N:311300 links; E:528110 

 links), type sample KS 233 (TTOC 18360) (Fitt Trace 

 marl of Cushman and Renz, 1948). 



Cotype localities: Navet River, eastern Central 

 Range (coordinates N:317120 links; E:500660 links), 

 sample KR 4347a (TTOC 1285). (Navet River marl 

 of Cushman and Renz, 1948). In small ravines be- 

 tween mileposts 12 and 12^ of the Brasso-Tlamana 

 Road and the Navet River, Central Range, and west 

 of the Brasso-Tamana Road, between mileposts 12)^ 

 and 12% (see text-fig. 25), samples K 8780, 8815, 8822, 

 8983. 



Lithology: Light grey, yellowish weathering, soft 

 marl. 



Remarks: In addition to the zonal marker the 

 Globorotalia lehneri zone is characterized by Globig- 

 erapsis kugleri BoUi, Loeblich and Tappan and Glo- 

 bigerinatheka barri Bronnimann which makes its first 

 appearance in this zone. Globorotalia aragonensis Nut- 

 tall and Globorotalia broedermanni Cushman and Ber- 

 mudez do not extend into this zone. 



Porticulasphaera mexicana Zone 



Type locality: Outcrop in road cut near mUepost 

 12% of the Brasso-Tamana Road, Central Range, type 

 sample K 8814 (see text-fig. 25). 



Cotype localities: In small ravines between the 

 mileposts 12 and 12K of the Brasso-Tamana Road and 

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

 samples K 8777, 8778, 8779, 8785, 8825. 



The Penitence HUl marl of Cushman and Renz 

 (1948) which falls in the Porticulasphaera mexicana 

 zone is no longer accessible. It was described from 

 the foundation of the Town HaU, Penitence Hill, San 

 Fernando, south Trinidad. 



A small block of Porticulasphaera mexicana zone, 

 Navet, containing an exceptionally well preserved 



