142 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The Kiicc<!8Kion of beds in this section, with the thickness, dip, 
and strike of each bed is indicated below: 
Charnrtcr <if rock 
strike 
Dip 
Thickness 
in feet 
Top of 
section 
Grey arenaceoiis limestones 
N 
20° E 
13° E 
.500 
Grey banded limestone 
30 
Grey nodular limestone 
30 
Grey hard sandstone 
30 
Grey nodular limestone 
N 
2,5° E 
.50° E 
.50 
Red and green shale 
N 
25° E 
15° E 
125 
Overturned part of sa.me 
N 
f)0° E 
40° NW 
Cleavage of same 
N 
25° E 
K0° NW 
Grey calcareous shales 
N 
25° E 
60° E 
10 
Dark grey sandstones 
N 
20° E 
20° E 
10 
Coarse shaly and rubbly eg. 
N 
30° E 
20° E 
114 
White sandstone or quartzite 
50° 
420 
Grey quartzose sandstone 
N 
25° E 
40° E 
642 
Base of section 
It will be seen at once that this section shows no positive evi- 
dence of an unconformity. It has been argued that the fact that 
the lower shales (Cambro-Ordovician) are so much more crump- 
pled than the other rocks, indicates that the shales had under- 
gone an earlier period of folding before the deposition of the 
upper beds. A glance at the strata composing the section, how- 
ever, show^s that these upper beds are in almost every case what 
we should call "competent strata," so that it would be a re- 
markable thing if they should be highly crumpled. The under- 
lying series, however, is composed of shales, with a few beds of 
limestone an inch or two thick, beds which under severe stresses 
would be likely to suffer crumpling, while the more resistant 
sandstones and limestones might merely be warped. That the 
shales within this upper series were much disturbed is evident 
from the following description.^ 
"Red and green shale, in alternating bands, with green argil- 
laceous sandstones. The dip of these beds where they overlie 
those . . . [immediately below] is S. 65° E.<^15°, their strong 
slaty cleavage having an underlay of N. 65° W.<l80°, but in fol- 
'Bailey, L. W., and Mclnnes, W. Ann. Rept. Geol. Surv. Canada 
1887-88, vol. 3, pt. 2, p. 30M, 1889. 
