64 



UNITED STATES NATIONAIj MUSEUM BULLETIN 215 



Globorotalia uncinata Zone 



Type locality: On the west side of the railway 

 track, south of the Pointe-a-Pierre Railway Station, 

 about 500 feet from the level crossing of Station Road, 

 Pointe-a-Pierre, Trinidad (coordinates N:259200 links; 

 E:362900 links). 



Remarks: The type locality is a small slipmass in 

 the Oligocene-Miocene Nariva formation. The zone 

 is characterized by Globorotalia uncinata Bolli, new 

 species, and Glohigerina spiralis BoUi, new species, in 

 addition to the planktonic faima of the Globorotalia 

 trinidadensis zone (with the exception of Globigerina 

 daubjergensis Bronnimann). 



Globorotalia pugilla pusilla Zone 



Type Locality: Trinidad Leaseholds, Ltd., well 

 Guayaguayare 159, Trinidad (coordinates N: 151361 

 links; E:554095 links), cores 4,524-36 feet and 4,778- 

 90 feet. 



Rbmaeks: Globorotalia pusilla pusilla BoUi, new spe- 

 cies, new subspecies, extends into the basal part of the 

 overlying Globorotalia pseudomenardii zone. Globoro- 

 talia angulata (White), G. ehrenbergi BoUi, new species, 

 and G. angulata hexacamerata Bolli, new subspecies, are 

 other typical forms of the zone. 



Globorotalia pseudomenardii Zone 



Type Locality: On the northeast bank of the Tank 

 Fann at the old Club Site, Pointe-a-Pierre, Trinidad 

 (coordinates N:256950 links; E:380000 links). 



Remarks: The type locality is a small slipmass in 

 the Oligocene-Miocene Nariva formation. A marked 

 change in the planktonic fauna occurs at the base of 

 this zone. Four species become extinct here and eight 

 appear for the first time. 



Globorotalia velascoensis Zone 



Type Locality: The original Lizard Springs locality 

 is maintained for this zone: Ravine Ampelu, Lizard 

 Springs area, about iM miles southeast of the road 

 junction of the Rio Claro-Guayaguayare Road (8% 

 M.P.) and the old Trinidad Central Oilfields Road 

 leading to the abandoned Lizard Springs oilfield, south- 

 east Trinidad (coordinates N:186454 links; E:556810 

 links), samples Rz. 282-291 (TLL 50315-16, 50503-10). 

 For better accessibility the following cotype locality 

 has been chosen: west side of railway track, south of 

 the Pointe-a-Pierre Railway Station, about 650 feet 

 from the level crossing of Station Road, Pointe-a-Pierre 

 (coordinates N:259200 links; E:362900 links). 



Remarks: Globorotalia velascoensis (Cushman) and 

 Globigerina velascoensis Cushman become extinct at the 

 top of the zone. Several species typical for the under- 

 lying Globorotalia pseudomenardii zone are absent. 



Upper Lizard Springs Formation 



The Upper Lizard Springs formation is divided into 

 the following zones (from bottom to top) : 



Globorotalia rex Zone 



Type Locality: In a left bank tributary of the 

 Cascas River, 3,400 feet from its confluence with the 

 Moriquite River, about 1% miles west of the point 

 where the Moriquite River crosses the Moruga Road 

 (between the 14 and 14}^ M.P.). The ravine is some 

 650 feet in length, extending from northwest to south- 

 east, and enters the Cascas River 250 feet downstream 

 from the intersection of the latter with the Forest 

 Reserve boundary. The type locality is an outcrop in 

 the river bed of the ravine, 180 feet from its junction 

 with the Cascas River (coordinates N:138700 links; 

 E:435000 links). 



Remarks: Eight species of Globorotalia and Globi- 

 gerina occur for the first time in the Globorotalia rex 

 zone. The long ranging characteristic Globorotalia 

 aequa Cushman and Renz becomes extinct at the top 

 of this zone. 



Globorotalia formosa formosa Zone 



Type locality: The original Lizard Springs locality 

 is maintained for the Globorotalia formosa formosa zone: 

 Ravine Ampelu, Lizard Springs area, about 1% mUes 

 southeast of the road junction of the Rio Claro-Guaya- 

 guayare Road (8^^ M. P.) and the old Trinidad Central 

 Oilfields Road leading to the abandoned Lizard Springs 

 oUfield, South East Trinidad (coordinates N:186505 

 links; E:556755 links), samples Rz. 281, 293, 296 

 (TLL 50314, 50512, 50515). 



Remarks: Globorotalia formosa formosa Bolli, new 

 species, new subspecies, G. aragonensis Nuttall, Globi- 

 gerina soldadoensis angulosa BoUi, new subspecies, and 

 G. prolata BoUi, new species, occur for the first time in 

 this zone. 



Globorotalia aragonensis Zone 



Type locality: Outcrop on the east side of the 

 Pointe-a-Pierre Road behind a dweUing house some 60 

 feet from the north end of the bridge across the Vista 

 BeUa River, San Fernando, Trinidad (coordinates 

 N:238700 links; E:263090 Unks). 



Remarks: The Globorotalia aragonensis zone which 

 is the uppermost zone of the Lizard Springs formation 

 is also known as Ramdat marl. In earlier pubUcations 

 (Cushman and Renz, 1948; Bronnimann, 1952) it was 

 attributed to the Navet formation. Because of its 

 close faunistic and Uthologic affinities with the Globo- 

 rotalia formosa formosa zone the Ramdat marl is now 

 included in the upper Lizard Springs. From a point of 

 view of lithology and fauna it is more justified to place 

 the Lizard Springs-Navet boundary at the top of the 

 Globorotalia aragonensis zone. The calcium carbonate 

 content rises sharply from 10 to 25 percent in the 

 Ramdat marl and other Lizard Springs zones to 50 to 

 70 percent in the overlying beds of the Navet formation. 

 Many new planktonic species, e. g., Globorotalia 

 palmerae Cushman and Bermudez, G. crassata (Cush- 

 man), and the first Hantkenina species appear in the 

 Navet formation in rapid succession. 



