GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 



21E 



15 genera and one subgenus of middle and upper Oligocene corals 

 apparently had become extinct in this region. The genus Thysanus is 

 present in the Pliocene Caloosahatchee marl of Florida ;'and in Santo 

 Domingo Placocyathus, Stylophora, AntiUia, and Syzygophyllia occur 

 at horizons above that of the Bowden marl,'while the number of species 

 now living increases. The Bowden marl marks an important change 

 in the character of the coral faunas, a change from an older to a more 

 recent facies. It therefore seems to me that the Bowden marl can 

 not be considered of Oligocene age, and that it must be referred to 

 the lower Miocene. 



SANTO DOMINGO. 



With regard to the species reported by Duncan from Santo Do- 

 mingo, it will be said that Duncan does not describe the stratigraphy 

 of Santo Domingo, but refers the specimens to the Nivaje shale, the 

 superficial or tufaceous limestone, Posterero shale, Cerro Gordo 

 shales, Esperanza shale, and "the silt of the sandstone plain." The 

 following is a list of the species recorded by him, the geologic forma- 

 tion in which they were reported to be found, and the revised names 

 with annotations: 



Fossil corals reported by Duncan from Santo Domingo. 



Name used by Duncan. 



"3 

 .a 



"3 



> 



3 § ' 

 +3 O 



as 



fto 

 3 o 



"3 



o 

 s> 



o 



"3 



m 

 03 

 N 



PI 



03 

 <D 

 ft 

 w 



w 



o3 a 

 & ft 

 og 



3 



Revised names and annota- 

 tions. 















Described from Vere, Jamaica; 





(?) 



+ 











genus doubtful; identifica- 

 tion doubtful. 

 Not determinable. 













Placotrochus lonsdalei Duncan. 













From yellow shale of Angos- 



wards and Haime. 



Trochocyathus latero-spinosus M. Edwards 



and Haime. 

 Paracyathus henekeni (Duncan) Duncan. 



+ 

 + 











tina, Santo Domingo; speci- 

 men not determinable. 

 Placocyathus new species. 











Paracyathus henekeni (Dun- 





+ 







can). 

 Placocyathus barrelti Duncan; 





+ 

 + 







+ 



originally described from 

 Bowden, Jamaica. 

 Placocyathus variabilis Duncan. 











Placocyathus costatus Duncan. 





+ 











Pocillopora crassoramosa Dun- 



+ 

 + 

 + 











can. 

 Stylophora affinis Duncan. 













Stylophora minor Duncan. 

 Stylophora new species; also 





















+ 



from Cerro Gordo shales. 

 Name discarded for Santo Do- 



Haime. 



+ 

 + 

 + 









mingan species. 

 | 











\Asterosmilia abnormalis (Dun- 

























Asterosmilia exarata Duncan; 



Stephanocoenia intersepta M. Edwards 



and Haime. 

 Antillastraea spongiformis (Duncan) 



Duncan. 











+ . 

 + 



also in Antigua formation, 

 Antigua. 

 | 













>Stephanocoenia intersepta (Es- 

 J per). 



\Dichocoenia tuberosa Duncan. 



+ 



+ 











+ 





