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Ch. XXVI.] STEATA AND EEDS OF THe' VAL DEL DOVE 



15 



As the continnitj of many of the beds in the boundary 

 cliffs of the Val del Bove has been thought by some to be 



opposed to the theory 



of their having flowed 

 in succession one over 

 the other down the 



Eiff. 75. 



slop in 



g 



sides of a 



great cone^ I may re- 

 mark, that provided 

 we behold a section 



running in the same 

 direction as the ori- 

 ginal course of the 



currents, we have Beds of doleritic lava and scorijB in the Serra del 

 every reason to ex- Solflzio, south side of the Val del Bove. 



pfect them to be con- 



es. Bed of stony lava 12 feet thick, inclined at an angle of 10*^. 



tinUOUS for several ^' -^^^ ^^ scoria with, angular fragments of scoriaceous lava 



^5 feet thick. 



miles. As to their c. Bed of similar materials, but coarser, thinning out at c7. 



e. Bed of basaltic lava, 3 feet in its greatest thickness, and 

 dipping at an angle of 27° (or 17° steeper than a). 



/. Fragmentary scoriaceous bed 10 feet thick, having a 

 similar dip with many others which underlie it. 



dip, even if it amount 

 to 20° or SO'', there 

 is no reason for con- 

 cluding, as I shall show in the sequel, that they may not 

 have been originally inclined at such high angles. 



remar 



cones laid open by 

 the grand sections 

 exhibited in the 

 cliffs of the Val 



a 



Fig. 76. 



del Bove. 



Such 



buried cones are 

 distinctly to be 

 seen in some in- 

 land ravines and 

 in seacliffs in Ma- 

 deira, and their 



Curvatures of lava in the hill of Zoceolaro, at the eastern 



extremity of the Serra del Solfizio. 



a, 6, c. Three beds of lava varying in thickness from 4 to 6 feet, 

 and separated by incoherent matter. 

 b thins out at b', 

 a and c are 40 feet apart in the middle of this section, and come 



absenCP in fhp Val "^^^^^^^ ^^ ^^^^ ^^ ^^^^ ^^ ^^^^^ ^*^^^' ^* ^^^ ^^*^ extremities of the 



same. 



del Bove implies 



that the great period of lateral eruptions was subsequent 



in date to the origin of that valley. 



