574 



CONGLOMERATE ROCKS 



ALTHOUGH most of these have already been 

 mentioned in a more or less distinct manner, 

 under the several rocks with which they occur, 

 it appeared expedient, as already remarked, to 

 collect the whole into one general view. The 

 repetition hence produced, will be compensated 

 by the facility of reference thus afforded ; while 

 many of the most important varieties, will also 

 be more particularly described, together with 

 others which must otherwise have been omitted 

 altogether. 



Some of the conglomerates occupy extensive 

 spaces in nature, while others are exceedingly 

 limited ; and they occur, as must already have 

 been perceived, both among the primary and the 

 secondary strata. Those which are found in 

 veins, are described under the title of veinstones. 

 These rocks may be divided into two kinds, 



