

GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 197 



nearly related to 0. mariannensis Cushman, and a second species of 

 Orthophragmina that is of lenticular form. I also collected two 

 species cf Nummulites and one species of Lepidocyclina in St. Bar- 

 tholomew. Lepidocyclina occurs in Georgia as far down strati- 

 graphically as a horizon about the middle of the Jackson formation, 

 and apparently as low as the base of the formation. The presence of 

 a species of Orthophragmina so similar to 0. mariannensis seems to 

 wanant the correlation of the St. Bartholomew limestone with the 

 upper part of the Ocala limestone of Florida and Georgia, and there- 

 fore with the Jackson formation in Mississippi and in the States 

 farther westward. 



Regarding the Brito formation of Nicaragua, it must be recognized 

 that a single poor specimen of coral furnishes slim evidence on which 

 to base a correlation. Doctor Cushman submits the following state- 

 ment regarding the foraminifera from the Brito formation: 



As to the Brito material, two lots especially are of interest. No. 6411 "•coast about 

 2 m. s. e. of Brito Harbor" marked "Ool. fos. 1. s." has abundant orbitoids with a 

 beautifully ornamented exterior which without the confirmatory evidence of sections 

 seem to be clearly Orthophragmina of a group not so far represented in the material 

 studied. From No. 6408 two miles n. w. of Brito Harbor, however, there is more 

 evidence. The material is very different and contains specimens which in accidental 

 section show definite chambers of Orthophragmina of a different group. This does not 

 however suggest either of the species from St. Bartholomew. Associated with it is a 

 species of the flattened, broadly spiral form- of nummulites. In the St. Bartholomew 

 material there is such a form but of a species very much larger. 



Now there is on the other hand a closer resemblance, that is to the lowest material 

 of the Flint River collections. The Brito species of Orthophragmina is similar so far 

 as I have made out to the one I have called 0. fiintensis. Moreover it is associated 

 at Brito as along the Flint River with this broadly spiral, flattened form of nummu- 

 lite. The specimens of nummulite from the two localities are very close in form 

 and size and only differ in minute details. They may not be specifically identical 

 in final analysis but are very close. 



The statement by Doctor Cushman seems conclusive. 

 A horizon very nearly the same is recognizable in Colombia as the 

 following quotation from Doctor Cushman shows : 



Now, as to the specimen from one league west of Arroyo Hondo, Bolivar, Republic 

 of Colombia. There is an association of Nummulites and stellate orbitoids which very 

 decidedly suggests Eocene. While I can not definitely make out the equatorial 

 chambers, the stellate form is very apparent in several specimens, and I should say 

 specifically different from any of the species of Orthophragmina described in my 

 paper from Georgia and Florida; in fact, they represent a very different group, I 

 think, but are undoubtedly Orthophragmina. 



Eocene deposits of the same or nearly same horizon as the St. 

 Bartholomew limestone are widely distributed in Cuba, as is indi- 

 cated by species of Orthophragmina and a number of echinoid species 

 that also occur in St. Bartholomew. 



