CORAL FORMATIONS OF OAHU. 255 
at work, which the drift-heaps of all beaches illustrate. It is a cor- 
rect registry of the various fortunes of the rising ridge; for the gale 
that swept off the summit, and the winds that laboured again in com- 
pleting it, have their effects here indicated in the solid rock. 
The following cuts represent sections from part of the Kahuku bluff. 
Fig. 1. 
a. In the section figure 1, there are three distinct divisions. The 
upper ten feet are laminated obliquely to the left; the next eight feet 
are horizontal, but not distinctly laminated ; and the lower seven have 
an oblique lamination sloping to the right. 
b. In figure 2, the upper four feet are horizontal; the following 
ten consist of several subordinate layers, dipping in different direc- 
tions; and near the middle there are two separate layers, composed 
each of thin lamin inclined at an angle of thirty degrees. 
c. In figure 3, representing the upper layer of the Kahuku bluff, 
the lamine of the lower portion to the left are straight, and incline 
twenty-five degrees to the left; these are covered with horizontal 
layers, curving downwards on the left; next above follow several 
layers, which, to the left, curve downward, and terminate against the 
surface of the layer below; and so the irregularities continue to 
the top. 
