750 WILLIAM F. JONES 
north range and as far as noted found only in that range. These 
rocks are intrusive into the old complex and their age is, therefore, 
indeterminate. The same rocks occur in Cuba and associated with 
them there are serpentines. Serpentines have not been noted in 
Haiti. The larger masses of these syenites and granites are fairly 
even-grained in texture while the smaller bodies and dikes which cut 
the surrounding rocks in numerous places are porphyritic. As far 
as known no petrographic descriptions of these rocks from Haiti 
have been published. 
There may be still older igneous members in the Paleozoic 
complex but the occurrence has not been noted. 
QUARTZ-DIORITE 
In the region north and northwest of Gonaives are intrusions 
of quartz-diorite. ‘These intrusives cut through the foraminiferal 
limestone series which is generally totally recrystallized along the 
contacts; and locally occur contact metamorphic deposits with 
the usual contact minerals, garnet, calcite, chalcopyrite, magne- 
tite, pyrite, bornite, etc. 
The age of the quartz-diorite intrusion is probably late Miocene 
and apparently took place at the time of general uplift and folding 
which followed the deposition of the middle Miocene sediments. 
ANDESITES 
Younger and cutting through the quartz-diorites are andesites. 
There also occur the associated andesitic flows and breccias. While 
these rocks are probably associated with the same general period of 
igneous activity as the quartz-diorites, nevertheless the flow ma- 
terials often occupy erosional depressions in the underlying rocks. 
Andesitic rocks occupy large areas in Haiti. The intrusive phase 
of the rock is somewhat variable in appearance. 
BASALTS 
Basalts occur at several places. There are basaltic flows from 
probable fissure eruptions along the northern side of the salt lakes 
in the Cul-de-Sac depression near Port-au-Prince. 
