60 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
the zone of dislocation being in low, marshy ground. At another place near Manchester, 
where an east and west fence follows the north side of a wagon road, both fence and 
road have been offset as shown in plate 32p. In both cases the relative movement on 
the southwest side was to the northwest. The dairy barn on the ranch of Mr. E. E. 
Fitch stood astride the line of movement and was demolished by the torsion to which it 
was subjected. The wreck of the barn is shown in plate 32c. At two places along the | 
stretch between Alder and Brush Creeks the bearing of the fault-trace was measured, 
the readings being N. 28° W. and N. 30° W. 
Southeasterly from Manchester the line of dislocation passes over the dividing ridge 
between Brush Creek and Garcia River, presenting the same general features. The 
upthrow is distinctly on the southwest side, but amounts, as a rule, to only a few inches. 
The horizontal displacement was measured on a line fence south of the divide. The 
fence is offset in two places. The principal displacement amounts to 13 feet; while on 
the minor offset, a little to the east, the displacement is 2.5 feet. The relative movement 
in both offsets is in the same direction, making the northwesterly displacement of the 
southwest side 15.5 feet. This fence is shown in plate 33a. South of this divide the 
main fissure passes thru a depression immediately east of a prominent knob projecting 
south from the divide; while a subordinate fissure traverses featureless hillsides from 
100 to 150 feet farther east. 
For some distance up the Garcia River from the point where the Rift intersects it, the 
line of dislocation traverses the flat alluvial bottom land, crossing and recrossing the 
stream bed. At David Jones’ ranch it leaves the bottom and ascends obliquely the side 
of the valley; and from this point to its head waters it remains on the western side of 
the valley. Its path is thru a belt of ridges and swamps. Part of the way there are 
two sets of ridges, the lower or eastern of which coincide with the new line of rupture. 
Looking along the valley, the more prominent of these ridges appear as notable features 
of the transverse profile. Opposite Hutton’s ranch, the line is found about 500 feet 
west of the river, and about 60 feet up on the valley slope. It crosses a road and fence 
here, producing offsets of 10 feet in both, in the same sense as before noted. At the 
head of the Garcia River, the fault-trace passes thru a low saddle into the valley of the 
Little North Fork of the Gualala River. 
Down the Little North Fork, the fault-trace follows the axis of the valley on its west 
side; at a point 1.5 miles north of its junction with the North Fork it runs lengthwise 
for over 100 yards with the grade of an abandoned logging railroad, tearing the same to 
pieces. Interesting evidence of the condensation or shortening of the ground in this 
vicinity is afforded by the buckling of the rails as seen in plate 33p. Here the main line 
of dislocation lies about 100 feet to the east of the track in the stream bed. The effect 
of the movement was to shorten the steel rails either by buckling or telescoping after 
the snapping off of the fish plates. The small trestle in the distance is traversed at an 
acute angle by an auxiliary line of dislocation and is similarly shortened. At the locality 
shown in plate 33c, the buckling in the foreground resulted in the breaking of the rails. 
Similar instances of the shortening of the steel are shown in the distance. Here the main 
line of dislocation of the earth lies about 50 feet to the east of the track, and parallel with 
it. Plate 338 is a nearer view of the trestle above referred to. Below this point the 
fault-trace lies in the stream bed for some distance, crossing the North Fork at a point 
200 feet east of its junction with the Little North Fork. Two lines of faulting appear 
here, both of which caused considerable damage to the railroad track; but the latter 
having been repaired before the date of Mr. Matthes’ visit, no measurements of offsets 
were obtainable. 
From this point southeasterly, evidence of dislocation along the line of the Rift, in its 
course up the valley of the South Fork of the Gualala, is obscured by the dense brush to 
