62 
REPORT —1847. 
The more nearly the elevating force shall have acted with uniform inten* 
sity, the more approximately will the above rule l>e applicable. If the force 
should act with greater intensity, or the resistance to it should be less, at 
particular points of the elevated district, it forms a part of the general Inves¬ 
tigation to determine the consequent variations in the directions of the pri¬ 
mary fissures. I shall not enter however into any discussion of this part of 
the problem; the detail# already given will suffice to explain the general 
principle on which this Theory of Elevation i# founded. 1 shall merelf 
observe with respect to these variations in the directions of the primary 
fissures, that they will usually be such os still to render the preceding rule 
approximately applicable, though the approximation may be less accurate in 
this than in the case of uniform intensity of the elevating force. 
§ Secondari/ P/uenomeria of Elevation. 
24. The formation of anticlinal ridges and valleys, faults, dykes, &c., by 
the continued action of the elevating force after the primary dislocation of 
the ujdified moss, is easily conceived. The fissures, as already stated, are 
the primary phenomena ; the scconJari/ jihtPiiomaia are such as those juat 
mentioned. Their distinctive chaructors will obviously depend in a great 
measure on the fissure.^ from which they are derived. The samepfirailclisDi 
wliich, as J have wliown, must fretjuently characterize systems of fissures, or 
the divergency wJiiuh will distinguish them in particular cases, will cquidly 
characteriicfi the sceondary phojitomena derivml n-om them, and the law above 
enunciated connecting the directions of fissures with those of the dip and 
strike of Urn elevated beds, will be equally applicable to faults, dykes, adne- 
ral veins, &c. Though such laws may be frequently masked in some de¬ 
gree by the operation of irregular causes, the careful observer may alwavs 
expect to find them more or less distinctly develojicd. For examples of the 
app ication ol the theory to the explanation of such secondary uhffinomena 
w ^ «Jay refer to my memoir ‘ On the Elevation of 
the Weald and Boa BouIontiHi.s/ vol. vii. of the Transactions of the Geolo- 
f Elevation and Denudation of the 
^ako Districts of Cumberland and Wcstmorelaml,* read before the Geologi¬ 
cal society some time ago. 
theoretical explanaUou of the 
bebil of Zr ?L u Phanoniena, tlicre are a few to which, as 
23 iSv iy^'f I nmy here direct attention. 
ticuhir'rSrf Beth at a FatiU.-Thet^ is a par- 
Mr PliiUiuH jY' r ‘ observed to exist very generally, 
thoiiS it t 'Vl'o lli,tincfly reJogtW it, 
tions of tlm two portions of the same 
stratifieil bed on opposite side# of a 
fuul^^^ar to the plane of the fault, 
i-ot h.!- rcpreseul the section of a fault 
by a vertical plane perpendicular to its 
genera! direction; PQ and Q'P' the 
^o portions of the dislocated bed. 
I hen. that portion of the bed which is 
: ° the two. is usually on 
that side towards which the fault in- 
tbe dia^ranr”"^"'^' 
ignized it 
It consists in 
Fig. I. 
