DISTINGUISHING LACUSTRINE FROM MARINE DEPOSITS. 149 
SPECIFIC GRAVITY OF TORRYBURN MARL. 


RARES DESCRIPTION OF Dpposrr. Beaune. 
No. 1 a Greyish-red sandy clay, Marine. 2.00 to 1.80 
RTE D Do. do. do. Fresh-water. 1.45 
No. 2 Olive-grey clayey sand do. 1.30 
No. 3 Brownish-red sandy clay do. 1.35 
No. 4 Greyish-brown clay (sandy seams) do. 1.35 
No. 5 * Olive-brown peat (many seeds) do. 1.05 
No. 6 Dark olive-grey peat (molluscs) do. .75 
No. 7 Dark grey peaty marl (do.) do. -80 
No. 8 Grey marl (molluscs abound) do. .83 
No. 9 Do. ( do. do. ) do. 79 






* This layer shrank one-fifth in drying; if it had retained its original size the specific gravity would have 
been less. All the samples were air-dried before weighing. 
