69

Origin of Breccia, introduce in Cordillera discussion, deep sea, fragments fall off cliffs. but then how spread abroad?

There is thus wide difference between erosive power of river & sea the former as its channel becomes wider looses its cutting power (as does it when the inclination becomes less & ∴ tends to finite power) whereas sea on coast, as long as exposed to waves of sea, cutting power increased with width for besides more surface exposed bay more open to turbulence.

70

Bull. Soc. Geolog 1837 P. 320 paper on shrinking of Clay applicable to Cleavage. C. Prevost.

In Cordillera a rush of water will account for filling up of valleys — subsequent opening a medial gorge by slow erosion but we have evidence in distribution of blocks, that there has been no tumultuous rush — besides general improbability stratification. If chain of lake &c