42 
W. Pengelly on the Red Sandstones, 
2. That, possibly, faults of considerable magnitude may exist, 
for which deductions should also be made. 
3. That the strata were, perhaps, never horizontal. 
The interruptions or breaks of continuity are three : namely, 
between Torbay and Babbicombe bay ; from the eastern extremity 
of Branscombe beach to the western end of Seaton beach ; and 
from Culverhole Point to the western termination of Charton Bay. 
I believe it to be capable of proof that deductions need not, 
and indeed should not be made on account of either of the first two 
breaks ; but wai^dng this point, and confining the calculation 
to the continuous succession of beds extending from Petitor, north 
of Babbicombe, to Beer Head, thus entirely omitting the beds in 
Torbay as well as those east of Beer, it will be found that the 
result falls but little below that already obtained. It must be 
borne in mind that the calculated thickness is a product of which 
one factor is the extent of the deposit in the direction of its 
inclination, and the other the sine of the angle at which the strata 
dip. Now by omitting the disturbed districts and the strata 
beyond them, the first factor will be diminished but the second 
will be increased; for in both the rejected areas the dips are smaller 
than they are elsewhere, and hence the means will be augmented 
by their withdrawal. Dividing the section into two parts, one 
from Exmouth southward, and the other eastward from the same 
place, the calculated thickness is 2-9 miles and 1-6 miles re- 
spectively, a total of 4'5 instead of 4*8, previously obtained.* 
* The following are the data (corrected for magnetic declination) from 
which this result is obtained : — 
Mean Dips. 
Angles between 
Distances 
Bearings. 
Dip Direction and 
Amounts. 
Directions. 
Bearing of Coast. 
From Petitor to Exmouth 
9"6 miles 
N. 27" E, 
N. 40® E. 
13« 
„ Exraouth to Beer 
Head .. 
14 
N. 721^ E. 
N. 77i° E. 
6" 
Hence we have total thickness of strata =9 6 miles X cos. IS*' X sin. 18** 
4- 11 miles X cos. 5° X Kin. 6^^= 2-9 -f 1-6 = 4-5. 
