426 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
and between Croft Creek, two miles to the west, and Sutton Creek, 
three miles to the east. 
The formation has been named the Sutton formation after Sutton 
Creek. No fossils have been found on Sutton Creek, but similar 
limestones to those which contain the fossils occur both to the north- 
west and southeast of the creek so that it is probable that the forma- 
tion crosses it. 
The fossil-bearing beds form one of the so called "lenses" of lime- 
stone which occur intercalated with the verj' thick lavas, principally 
Text-fig. 
intercalated 
1. — Sketcli map showing occurrence of fossil-bearing limestone beds 
with basalt. 
basaltic, whicli make up the bulk of the Vancouver group. Tlie lens 
in which the fossils were found is about 500 feet across the outcrop. 
The strike of the beds is about N. 35° E. and the dip from 50° to 70° 
to the northwest. The thickness is therefore about 400 feet. The 
general strike of the whole Vancouver group, and proljably that of 
the Sutton formation, is about N. 55° W. 
The limestones were evidently formed by the accumulation of 
organic material. Two beds occur which are formed entirely of 
corals and are doubtless old coral reefs. Between the coral beds are 
strata composed almost entirely of small fragments of calcareous 
