Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
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Transcription
135
August 9.
Portland Head.
Since Portland Head from elements note: "The present face of
Portland St. strikes but little north of east and the dip of the strata must be nearly
south. The head presents a bold steep face on the west and north sides and
appears to slope gradually away on the southeast. It seems probable that the
slope of the head is determined by the structure, thus being the up-tilted north
west corner of a faulted block bounded by 2 faults. The objection to this hypo-
thesis is that the beds of the head appear to dip about in accord with the
sandstone exposed on the shore as though the section were continuous. However
the line is about 300 feet from the shore and the observed dip in the hill and
on the shore was about 20°. This dip for the natural overall include 1000
feet of strata plus 530 feet, the height of the head = 1530 fuly 9 and time
in order to make the head part of the same sandstone.