218 



BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



An inspection of the foregoing table shows that at zone H Orbicella 

 cavernosa and Solenastrea bournoni, both now living, were collected, 

 bringing the total of living species from the Bowden horizon up to four. 



The following are my conclusions on the geologic age of the coral- 

 lif erous beds of Santo Domingo : 



1. The oldest fauna represented by Miss Maury's collection, zone 

 H on Rio Cana, is that of the Bowden marl. It is somewhat younger 

 than the Chipola marl of Florida and is of Burdigalian age according 

 to European nomenclature. 



2. Zone F is closely related to G and H. It is also probably of 

 Burdigalian age, and corresponds to a part of the Alum Bluff forma- 

 tion of Florida lying above the Chipola marl member. 



3. Zone E and D are faunally near the underlying beds and are 

 probably of uppermost Burdigalian or Helvetian age. 



4. Zones C to A, inclusive, are probably of Helvetian age. 



5. The Santo Domingan coral faunas are younger than the exten- 

 sively developed Oligocene coral reefs of Georgia, Florida, Cuba, 

 Porto Rico, Anguilla, Antigua, and Central America. 



6. The presence in Santo Domingo of Asterosmilia exarata variety, 

 which is also found in the Antigua formation, of a species of Lepto- 

 mussa, and of Siderastrea conferta (Duncan) typical, indicates that 

 there are deposits of middle and upper Oligocene age in Santo 

 Domingo, but Miss Maury did not make collections of corals from 

 those horizons. 



CUBA. 



BARACAO AND MATANZAS. 



Fossil corals of Bowden age were collected at two localities — - 

 namely, station 3476, in a yellow marl at Baracao; and station 3461, 

 also in a yellow marl in the gorge of Yumuri River, Matanzas. The 

 species are as follows : 



Fossil corals from Baracoa and Matanzas, Cuba. 



Name. 



Baracoa. 



Matanzas 



Bowden. 



Stylophora granulata Duncan 



Pocillopora baracoaensis Vaughan 



Madracis mirabilis (Duchassaing and Michelotti) . 



Thysanus hayesi Vaughan 



Pontes baracoaensis Vaughan 



var .matanzasensis Vaughan 



X 



X 



x 





x 







X 



X 





LA CRUZ MARL. 



This name is proposed for the bedded, yellow, argillaceous, and 

 calcareous marl particularly well exposed on the east side of Santiago 

 Harbor between Santiago and the Morro. The type exposures are 

 along the railroad eastward from the La Cruz to the crossing of the 

 highway from Santiago to the Morro. The corals collected in this 



