ISOSEISMALS: DISTRIBUTION OF APPARENT INTENSITY, 319 
Peachtree. — As Peachtree was approached, there was a perceptible rise in the inten- 
sity. About 2 miles east of the post-office, dishes had been thrown over and milk spilt 
from pans. At the station itself, however, nothing had been overturned. The region 
visited between Cholame and Peachtree is in small valleys lying in the mountains on the 
west side of the Salinas Valley. The soil is nowhere deep. 
Cantua Creek, Fresno County (8. C. Lillis). — The shock was severely felt in this region, 
and its direction was southeast-northwest. A series of landslides caused by the earth- 
quake were reported by Mr. Lillis, extending from the northwest corner of T. ISHED. 
14 E., M.D.M. to the middle part of T. 15, R. 11 E., a distance of about 23 miles. The 
features were not at first recognized by Mr. Lillis as landslides, and as they occurred on 
the east side of the Coast Ranges, on the border of a portion of the San Joaquin Valley, 
where the intensity was abnormally high, the hypothesis was entertained that there 
might have been a supplementary fault in that region along the edge of the mountain 
range. ‘The remarkable alinement of the features lent support to this suggestion. The 
region was, however, subsequently visited by Prof. G. D. Louderback, in company with 
Mr. Lillis, and the features reported by the latter were found to be landslides. Pro- 
fessor Louderback furnishes the following note regarding them: 
The phenomena reported by Mr. Lillis are several landslides. In each case the effect of 
the movement can be followed in detail and sharply delimited. The form of the moved body 
is typically that of the landslide in each case, with the cliff at the upper end curved and 
concave toward the lower part of the slope. The mass has moved away and downward, 
leaving in some instances an open space or fissure, partially filled at the present time (May, 
1907) by caving. The back cliffs, followed around, gradually pass into lateral planes of 
movement, which themselves are sometimes gaping on the more elevated side, showing a 
forward and slightly lateral movement of the mass. (See plate 125B.) 
No general fissure, fault, or rift was observed passing thru or near these landslides, altho 
a careful search was made for such features. I suspected at first that there might be such a 
rift-line, because the landslides are approximately along one line or belt. This appears, 
however, to be due to the fact that one particular formation is especially favorable to land- 
sliding, all the slides that I saw along the lower part of the range being associated with a 
thick reddish-brown shale of a definite stratigraphic horizon (Tejon?). The general struc- 
ture of the range causes the rocks of any given horizon to outcrop along a line roughly 
parallel to the range front (approximately northwest-southeast). The landslides all lookt 
fresh, and according to Mr. Lillis several of them (and probably all of those under con- 
sideration) were caused on April 18, 1906. I made a trip across the hills from the valley 
to New Idria and noted nothing that appeared to be a recent seismic line. 
EAST SIDE OF THE SAN JOAQUIN VALLEY SOUTH OF MODESTO AND THE ADJACENT 
PORTIONS OF THE SIERRA NEVADA. 
In this region information regarding the intensity of the shock is rather scant. The 
shock was in general not sufficiently severe to excite alarm, and people as a rule did not 
note carefully its effects at the time. Such records as are available indicate that an 
intensity ranging from VI to V prevailed to the eastern edge of the valley, but that it 
died out rapidly in the mountains beyond. 
Merced, Merced County. — Clocks generally were stopt, and hanging objects were 
caused to swing. One chandelier was observed to swing north and south, and then in 
a circle. 
Madera, Madera County (F. E. Smith). — The principal disturbance was preceded 
by a tremulous motion for about 10 seconds. There were 2 maxima in the principal 
disturbance, the second being the stronger; and a tremulous movement succeeded it. 
The apparent direction of the movement was from southeast to northwest, and objects 
were overturned toward the northwest. The duration of the shock was thought to be 2 
