and. Disturbed Stratification. 383 
addition a few minute quartz particles, probably nuclear points 
or particles that adhered unobserved to larger ones when 
dropped in the acid. 
forth a few bristles of magnetite. Examined under a polarizing 
microscope the associated dust is seen to be largely quartz, and 
the finer grains to be mainly quartz and fragments of granular 
limestone and dolomite, to which are added a few splinters of 
clean crystalline calcite, an occasional grain of magnetite, and 
not infrequent dark or black, nearly or quite opaque grains, 
whose character was not determined. — 
An analysis of the leading ingredients by Professor E. G. 
Smith gave: 
— Insoluble in HCl. ; Soluble in HCL 
al see 2 2 CaCO, = 44294 
Al,O, 1057 MgO0, 26-070 
Fe,0, 839 
CaO trace, undetermined 70°364 
MgO “ “ 
23°053 
P,O, undetermined 
HO ate 
Fe,0, “ 
A 
6°583 subject to correction 
for loss or gain. 
100°00 
