Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Bic. July 15-1913.
Joungs map gives the profile thickness as
3500 ft provided there is no duplication due
to folding. Of this about 1/3 is quartzite and
conglomerate. The latter everywhere sticks out
as high rugged hills, abruptly in the general
level plain. The other material is shale mostly
a green shale although we saw but little of it.
The conglomerates here are tremendous and
of the greater interest. The outer masses at the river
bank are mainly of limestone pebbles all bound up
in a lime paste underneath made of the limestone
pebbles. The pieces are all somewhat rounded and
while most of the material is not more six inches in
diameter still there are blocks easily 4 feet thick.
Occasionally one sees a well rounded shale boulder
some 8 or 10 inches diameter, rather reddish in color.
Also the characteristic quartzite
boulders that may go to 2 feet across. Further but
one more a dark rock that may be igneous but
Lawson finally thought not (have a piece of it).
Finally all through the li. angle are pockets