Image from the Biodiversity Heritage Library.
Contributed by Smithsonian Institution Archives.
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Transcription
72. From 73, through 74, to 77
are Archaean exposures which
could be followed further north.
wards. A valley lies just west
of the course, representing the
contact between the Archean,
and the Cambrian still to
the west. At 77 The Archean
is limestone.