GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 



223 



and Thysanus, have close relatives in the present Floridian fauna. 

 I have previously pointed out 1 that this fauna contains no genera 

 at present confined to the Indo-Pacific, such as Placoiroclius, Placo- 

 cyathus, StylopJiora, Pocillopora, AntUlia, Syzygopliyllia, and Gonio- 

 pora, all of which occur in the West Indian Miocene, and all except 

 the first two also occur in the West Indian Oligocene or Eocene. 



LIMON, COSTA RICA. 



Certain corals collected in the vicinity of Limon are reputed to 

 come from a bed of Pliocene age. They are as follows: 



Madracis mirabilis (Duchassaing and Michelotti). 



Archolielia limonensis Vaughan. 



Orbicella annularis (Ellis and Solander) var. 

 cavernosa var. endoihecata (Duncan). 

 var. cylindrica (Duncan). 



Except Archohelia limonensis, it appears that these corals might 

 represent the Santo Domingan Miocene above the Bowden horizon. 

 The material is not adequate for a positive opinion. 



CARRIZO CREEK, CALIFORNIA. 



Recently I have described in detail an interesting small reef- 

 coral fauna from Carrizo Creek, Imperial County, California. 2 



The following table, taken from the paper mentioned, contains 

 the names of the species composing this fauna and of the most 

 nearly related species in Florida and the West Indies. 



Corals from Carrizo Creek, Cal. 



Name. 



Most nearly related species in Florida or West 

 Indies. 



Eusmilia carrizensis Vaughan 



Dichocoenia merriami (Vaughan) 



var . crassisepta Vaughan 



Solenastrea fairbanksi (Vaughan), typical 



var. columnaris (Vaughan) 



var. normalis Vaughan 



var. minor Vaughan 



Maeandra bowersi Vaughan 



Siderastrea mendenhalli Vaughan 



var. minor Vaughan 



Siderastrea calif ornica Vaughan 



Porites carrizensis Vaughan 



Eusmilia fastigiata (Pallas), PI, R. 

 \Dichocoenia species, P; D. stokesi Milne Edwards 

 / and Haime, PI, R. 



[Solenastrea hyades (Dana)fand <S. bournoni Milne 

 Edwards and Haime, P, PI, R. 



Maeandra labyrintliiformis (Linnaeus), PI, R. 



\siderastrea dalli Vaughan, P. 



Siderastrea pliocenica Vaughan, P. 

 Porites astreoides Lamarck, PI, R. 



P, Pliocene; PI, Pleistocene; R, Recent. 



Regarding the geologic age of this fauna, it was said: 



The specific affinities of the Carrizo Creek corals are discussed in detail after the 

 descriptions in the systematic part of this paper. The Carrizo Creek species are so 

 near species belonging to the same genera in the Pliocene Caloosahatchee marl of 

 Florida and in the Pleistocene and living reefs of Florida and West Indies that it 

 seems to me they can scarcely be so old as Miocene; lower Pliocene appears to be the 

 maximum age which may be assigned to the fauna. 



i The reef-coral fauna of Carrizo Creek, Imperial County, California, Prof. Pap. 98-T. p. 366, 1917. 

 2 IT. S. Geol. Survey Prof. Pap. 98-T, pp. 355-386, pis. 92-102, 1917. 



