746 WILLIAM F. JONES 
conformably on a series of deep-water limestones which extend 
through late Eocene and into early Oligocene. Thirdly, the Santo 
Domingo equivalents of the upper part of the Miocene-Oligocene 
series in the Yaqui Valley rest directly on the Paleozoic complex and 
the limestone series is lacking. Fourthly, in Jamaica there is a well- 
defined break in middle Oligocene time between the two. These 
relationships would point to an unconformable relationship between 
the two which in the Haiti section, since dips are concordant, would 
be adisconformity. The fact that the upper series is so thick below 
the late Oligocene, together with the fact that these beds contain 
no material derived from the limestone, and also from the fact that 
the limestones do not occur on the north side of the range, would 
seem to indicate that no unconformity exists in the Haiti section 
and that this set of conditions can be explained only in one way. 
The thick oceanic limestones were apparently formed against a coast 
off which there was an abrupt drop to deep water and this coast line 
lay across Haiti from southeast to northwest about on the line of the 
north range. The limestone would then be deposited in the form of, 
abrupt overlap to the north. Uplift, which was sufficient to bring 
the limestone above the sea elsewhere, left it along this shore still 
below sea-level so that the later sediements (Thomonde, etc.) 
were laid down conformably on it. Gradual depression brought: 
about overlap of these later sediments and the Santo Domingo 
section was deposited. 
THE TERTIARY SERIES OF THE SOUTH PENINSULA 
The foregoing notes apply chiefly to that part of Haiti north of 
Port-au-Prince and the Cul-de-Sac depression between the central 
and south ranges. ‘The writer’s observations on the south peninsula 
have been chiefly confined to following out in a general way Tippen- 
hauer’s sections’ and modifying in some cases his interpretations of 
structure. 
The probability of Cretaceous formations in this region have 
been previously noted. ‘The Tertiary series is in general the same as 
in the northern part of Haiti but there seems to be a modification 
which points to a closer similarity in lithologic characters to the 
1 Op. cit., Bd. 45, pp. 25-29, 201-4; Bd. 47, pp. 169-78. 
