﻿GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 555 



Stations 6010, 6012a, and 6012c are along the Canal (see pi. 154), on 

 the Culebra formation; station 6512 is the river bed in David and 

 station 6523 is 2 miles north of David, on a limestone probably of 

 lower Oligocene age. It therefore seems that L. duplicata is of 

 both lower and middle Oligocene age, while L. panamensis occurs in 

 lower, middle, and upper Oligocene deposits. 



The following is a list of the corals collected by Doctor MacDonald 

 near Tonosi : 



FOSSn, CORALS FROM STATION 6587, TONOSI. 



The species after which Cuba is given in the column for distribution 

 were collected by Mr. O. E. Meinzer near Guantanamo. Those corals, 

 which clearly belong to the coral fauna found in the Antigua formation 

 of Antigua, supply additional evidence for correlating the foramini- 

 feral limestones exposed at stations 6586e and 6587 with the lower 

 part of the Culebra formation. By referring to my account of the 

 successive coral faunas of the West Indies and Central America, pages 

 193 to 220 of this volume, it wiU be seen that, although I refer the coral 

 fauna of the upper part of the Culebra formation to the upper Oligo- 

 cene (==Aquitar)ian of European terminology), I consider that fauna 

 as intermediate between the fauna of the Emperador limestone and 

 Anguilla formation and that of the Antigua formation, because it 

 contains a number of species in common with the latter formation. 

 The coral fauna represented at Tonosi is, in my opinion, of middle 

 Oligocene age, and belongs stratigraphically just below that found in 

 the upper part of the Culebra formation. 



CUCURACHA FORMATION 



The only fossils as yet identified from the Cucuracha formation 

 are two species of plants, Palmoxylon palmacites (Sprcngcl) Stenzel 

 and Taenioxylon multiradiatum Felix, from station No. 6845, which 

 is on the green clays of Gaillard Cut, near the lava flow. The first of 

 these species was obtained only in the Cucuracha formation; but 

 the second occurs in the Bohio conglomerate and the Culebra for- 

 mation. 



