Marie, sent back,
and to accompany me in my voyage as far as _La Pointe_.
GEOLOGY.--We spent the next day in examining the magnesian and
calcareous rubblestone which appears to constitute strata resting
against and upon the serpentine rock of Presque Isle. This rock is
highly charged with what appears to be chromate of iron. We examined the
bay behind this peninsula, which appears to be a harbor capable of
admitting large vessels. We ascended a conical hill rising from the bay,
which the Indians call _Totoesh_, or Breast Mountain. Having been the
first to ascend its apex, the party named it Schoolcraft's Mountain.
Near and west of it, is a lower saddle-shaped mountain, called by the
natives The Cradle Top. Granite Point exhibits trap dykes in syenite.
The horizontal red sandstone, which forms the peninsula connecting this
point with the main, rests against and upon portions of the granite,
showing its subsidence from water at a period subsequent to the upheaval
of the syenite and trap. This entire coast, reaching from Chocolate
River to Huron Bay--a distance of some seventy miles--consists of
granite hills, which, viewed from the top of the Totoesh, has the rolling
appearance of the sea in violent motion.
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