76 ELEMENTARY GEOLOGY 
accumulation of talus material (Fig. 58) formed of 
angular pieces produced by the disintegration of the 
cliff. This coarse mass of angular fragments is breccia 
(Fig. 27), and it may be formed at the base of a 
cliff either on the land, or in the sea or lake. The 
deposits formed by a glacier are also of this nature, 
Fie. 27. 
A breccia. 
being composed of large, angular fragments, enclosed 
in a matrix of finer particles. These are well illus- 
trated in the soils of the northeastern states and 
Canada (p. 121). 
In the beds of many rivers, and on the pebbly beach 
(Fig. 28), the rock fragments are rounded, forming 
