DOME STRUCTURE IN CONGLOMERATE 563 
regards length and thickness, and represent the lower edges of more 
or less well-developed scales. Small scales transverse to the larger 
ones are often developed across the lower portions of the latter, the 
line of parting always beginning at the interior surface of the larger 
scale and extending up into it toward its outer surface. An example 
of such a secondary scale is shown in Fig. 4, which is a profile of the 
north face of Eagle Rock. Many other scales, some of them from 
Fic. 3.—Near view of Eagle Rock, from the north, showing caves, some smaller 
arches, and profile of the west face. 
one to six inches thick, and some thinner, but most of them inconspicu- 
ous in the photograph, are developed over the steeply sloping faces 
of the rock. It is a very significant fact that the interior walls of the 
caves, which are practically dry at all times, are not scaling off; 
neither is the south face, nor the top of the dome. 
OTHER EXAMPLES 
At the western end of the Eagle Rock Valley are several prominent 
examples of dome structure in conglomerate similar to that composing 
