diller.] TERRACES NEAR ROGUE RIVER. 27 
the Coos Bay quadrangle, as well as on the trail from Denmark to 
Eightmile Prairie and on the next divide beyond Crystal Creek. It 
occurs also on the divide between Edson Creek and Sixes River and 
at numerous other points farther south. The terrace connected with 
this beach is usually not wide, but on the whole is one of the best 
preserved of the upper terraces along this portion of the coast. 
The 500-foot terrace is most extensively developed north of the 
Coquille, where it is separated from the coastal plain by several sea 
cliffs and intervening- plains. The 1,000-foot terrace is well devel- 
oped near the northern end of the Port Orford quadrangle, and is 
usually the most prominent of the elevated terraces on the coast. 
At Port Orford the coastal plain ends and a prominent rocky sea 
cliff begins and continues with scarcely any interruption to the mouth 
of Euchre Creek, where a narrow belt of dune sands appears. Then 
comes a small coastal plain at an elevation of from 60 to 80 feet, ex- 
tending from Ophir to the mouth of Rogue River. Near Ophir the 
cliff by the sea limiting the plain exposes Pleistocene sands to the 
sea level, but farther south it is cut on harder tilted sandstones and 
shales. 
At Port Orford a prominent terrace at 300 feet spreads several 
miles to the northeast toward the Elk River divide. This divide 
rises by a number of terraces to the plains at the 1,000 and 1,500 foot 
levels. The latter is marked east of the stage road in the flat-topped 
hills about the head of Hubbard Creek. From the summit of Hum- 
bug Mountain the wide sweeps of the upper plain at about 1,500 feet 
is evident, and when that plain was at sea level Humbug Mountain 
and Colebrook Butte were small islands. 
Just north of Rogue River higher terraces may be seen, but they 
are not so conspicuous as the coastal plain. The highest is best dis- 
played along the trail up the southern end of Brush}' Bald Mountain 
and is at an elevation of 1,500 feet. The terrace with its sea cliff is 
of but small extent and the rounded slopes above are 'distinct. 
ROGUE RIVER TO CRESCENT CITY, CAL, 
South of Rogue River a small coastal plain extends to Hunters 
Creek, to be replaced beyond by a more precipitous, irregular, rocky 
coast, which extends almost continuously for at least 20 miles to Lone 
Ranch Creek, 7 miles north of the mouth of Chetco River. Although 
this portion of the coast is bold, there are places where higher beaches 
attain considerable size. A section over the seaward slope was made 
from Scotts to the mouth of Lone Ranch Creek. The Klamath pene- 
plain, fronting the coast, has an altitude of 1,800 feet. The firsl 
traces of terraces were seen at 1,500 feet, where the Lone Ranch 
road turns west to descend over the series of terraces to the coast. 
Although smaller terraces were seen at 1,140, GOO, and 400 feet, the 
