628 ALLUVIA. 



SYNOPSIS OF ALLUVIA. 



FIRST DIVISION. 



Loose. 



A. Single stones, more or less accumulated in 

 particular places, generally bearing marks of waste in a 

 greater or less degree, and commonly consisting 1 of the 

 older rocks. 



a. Granite boulders. 



b. Boulders of other rocks, which it is 



unnecessary to distinguish, as the for- 

 mer, from their greater conspicuity 

 and frequency, have here been. Sin- 

 gle in inland situations, and forming 

 heaps on sea shores. 



B. Stones of various sizes mixed with sand or 

 clay or both. 



a. The produce of one rock : alluvia 



formed in situ. 



b. Pebbles of flint with sand and clay. 



London gravel bed. It is uncertain 

 whether these pebbles have been 

 rounded by the action of water, or are 

 in their original forms. 



c. Rounded fragments of various rocks, 



intermixed with clay or sand. Dilu- 

 vian alluvia, and the alluvia of rivers. 



d. Fragments slightly rounded, or angu- 



lar, with clay and sand. Alluvia of 

 descent. 



