A GEOLOGICAL RECONNAISSANCE IN HAITI 935 
series underlies the entire central plain of Haiti and another area 
south of Mirebalais and probably underlies much of the lower 
valley ofthe Artibonite River. The beds are well exposed and are 
folded, highly in places, especially along the west side of the central 
plain, so that good sections can be seen. The whole series is very 
thick, perhaps as much as 10,000 feet, and is, in places, extremely 
fossiliferous. Some small amount of detailed work was done on 
these rocks and some fossils collected, though the work as yet is 
Fic. 3.—Las Cahobes beds near Las Cahobes 
by no means systematic. The writer expects to present further 
notes on this series in the near future. 
Referring to the central plain area, these beds occupy a broad 
syncline. All along the foothills of the north range, on the east 
side of the plain, the beds dip southwest at varying degrees up 
to 35°, and as far as noted the dips are concordant with the dip of 
the underlying limestone. On the west side of the plain the struc- 
ture is complicated by sharp flexures and in many places the con- 
tact with the underlying limestone is one of faulting. 
South of Hinche in the vicinity of Thomonde an asymmetric 
anticline strikes off the Montagnes Noires Range in a southeasterly 
direction and from this vicinity on to the southeast the structure 
underlying the plain is that of two broad synclines with the 
