Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
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Transcription
August 26.
Bonne Bay.
196
Inland for about one mile from the crest of the mountain we climbed,
in a direction N. 30 E., paralleling Mill Creek and forming its
cliffed valley wall. The Cambrian strata dip 20 S. 45 W. A
thickness of not less than 400 feet of cleanly scratched white and pinkish quartz-
ite forms the crest of the mountain, and below there is an additional
thickness of 80 feet of interbedded sandy shale, thin bedded sandstone
and quartzite. These Cambrian strata occupy a width of about 480
yards measured from the base of the drift where the steep descent begins
cross the strike northwards to the contact with the Portuogies. The upper
contact with the Portugesis is not exposed but a short distance beyond
the lowest Cambrian quartzite seen we come upon friable, sandy, clayey
gray shale dipping 50 N. 45 E., and this dip continues through a part
thickness of the same kind of strata so that the Cambrium must lie upon
it with a high angle of unconformity.
The width across this Port. sandy shale is a mile along the edge of the
cliff in a direction N. 30 E. which is equivalent to run 4800 feet across the
strike (N. 45 E.). In this distance there is an almost continuous exposure
and the dip remains uniform, without marking a tendency, and the lithology
is fairly uniform throughout. At 20 degrees this would give a thickness of
run 3700 feet of Portuogies' sandy shale. In the whole section there is
no quartzite or solid sandstone layers, norli, and it could not by any similarity
be a repetition of the Cambrium.
"About 3/4 the distance across this axis, i.e. strike for the way to its
to find my first Portuogies' fossils." See page 189 for more.