MUSEUM OF COMPARATIVE ZOOLOGY. 275 
Comparison and Correlation of Various Levels. 
Let us now compare the various data presented concerning the coast 
and inland topography at the various localities mentioned, and inquire 
into their relation to each other. Figure 8 of Plate I. will aid in under- 
standing the presentation to follow. 
That the soboruco or elevated reef represents the same general level 
around the north and south coasts of Cuba is indisputable, and can be 
interpreted in no other way than that there has been in recent time a 
uniform elevation throughout the nine hundred miles represented in the 
length of the island. It is the same formation topographically and geo- 
logically, wherever seen, and establishes the fact that the elevation of 
the island, at least during one epoch, was general, and not local or spas- 
modic. Ifsuch a uniform movement has beyond doubt taken place at 
a modern epoch, it establishes the principle that similar elevations were 
not impossible in the past. 
The levels represented in the three terraces of the Yumuri of the east 
have remarkable identity with the levels of the west end of the island, 
as at Havana and Matanzas, where my detailed studies were made. The 
only difference is, that the latter are wider than the former, owing to 
the lower and more rounded character of the country out of which they 
were cut. The correspondence in altitude is such that no one can doubt 
that they represent synchronous and identical regional movements and 
pausations, and that they were once continuous throughout the length 
of the north coasts of the island, and around Cape Maysi to the Santiago 
coast. ; 
The Cuchilla, or dissected peneplain of the east, presents a remarkable 
analogy to the higher dissected summits back of Matanzas, constituting 
the upland divide of the west end of the island in the latitude of Havana. 
Here the old levels represented by these summits are less distinct than 
in the east, probably owing to the fact that this end of the island had 
not previously been so highly elevated as the east. 
The oldest and highest limestone summits, approximating from fifteen 
hundred to two thousand feet, as typified in Yunque, the Sierra del 
Moa, the Pan de Matanzas, the table land of Mariel, and the Managua 
Paps of the west half of the island which follow near the north coast, the 
highest limestone at Santiago and other places, represent the remnant 
of the oldest and highest level or levels, which have been so completely 
dissected and planed down that their extent can only be estimated. 
