Fault at Waimea, Oahu — Palmer 
91 
ern block was raised. A tentative suggestion 
is that a considerable body of molten matter 
was intruded under this block, perhaps at the 
time of the eruptions at Diamond Head and 
at numerous other young vents in the south¬ 
eastern part of the Koolau Range. 
CONCLUSION 
It is not to be expected that one can de¬ 
tect faults in Hawaii by the offsetting of lava 
flows, because the individual flows are of 
small lateral extent and because there is great 
variation in texture and thickness from place 
to place within each lava flow. 
It is believed that faulting occurred at 
Waimea, Oahu, because this region shows a 
number of features that would have resulted 
from faulting, and for which no other ex¬ 
planation comes to mind. These features 
include: 
1. Offsetting of the shore line. 
2. Offsetting of the restored contour lines. 
3. Higher wave-cut cliffs on the up- 
thrown side. 
4. Concentration of perennial stream 
courses near the fault. 
5. A step in the profile across the fault. 
6. Two-cycle topography on the up- 
thrown block. 
7. A subdued scarp such as prolonged 
erosion would make of a fault cliff. 
The cumulative evidence of these features 
seems to indicate faulting, although actual 
offsetting of the rock layers has not been 
found. 
REFERENCES 
Stearns, Harold T., and Knute N. Vaksvik. 
Geology and ground water resources of the 
island of Oahu, Hawaii. 479 p., 34 fig., 33 pi. 
Ter. of Hawaii, Div. Hydrog., Bui. 1, 1935. 
U. S. Geol. Survey. Advance sheets of Haleiwa, 
Kaipapau and Laie quadrangles of the topo¬ 
graphic map of Oahu. Surveyed in 1929 and 
1930. Scale 1:20,000; contour intervals 10 and 
50 feet, [n.d.] 
U. S. Geol. Survey. Topographic map of the 
island of Oahu, City and County of Honolulu, 
Hawaii. Scale 1:62,500; contour interval 100 
feet, 50-foot contour added. 1938. 
