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“ 
[Boor TIT. 
244 DYNAMICAL GEOLOGY. 
likewise occur by themselves apart from any lava-producing voleano, 
though usually they afford indications that columns of lava have 
risen in their funnels, and even now and then that this lava has 
reached the surface. : 
The cones of the Hifel district have long been celebrated for their 
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THE CONE AND CRATER OF Puy PARIOU. 

Fig. 49.—Vinw oF THE Turr Cones of AUVERGNE, TAKEN FROM THE TOP OF 






wonderful perfection. Though small in size they exhibit with 
singular clearness many of the leading features of volcanic structure. 
Those of Auvergne are likewise exceedingly instructive.! The high 
plateaux of Utah are dotted with hundreds of small volcanic cinder- 
cones, the singular positions of which, close to the edge of profound 
_* Berope, “Geology and Extinct Volcanoes of Central France,” 2nd edil., 1858 
Hibbert, “ History of the Extinct Volcanoes of the Basin of Neuwied on the Lower 
Whine,” din. 1832, Von Dechen, “ Geognostischer Fiihrer zu dem Laacher See,” 
Bonn, 1864. “ Geognostischer Viihrer in das Siebengebirge am Rhein,” Bonn, 1861, 


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