itish carbonate of lime in minute
crystals. I could not satisfy myself whether this variety of colour
proceeded from partial impregnations of bitumen, or from a brecciated
structure. Specimens 58 and 59 were from beds near the western part of
the hill.

60 A fine-grained dolomite, approaching to compact, having a flat and
somewhat splintery fracture, and a brownish-gray colour.

61, 62 Limestone in the body of the hill, resembling No. 39 in the hill
at the rapid in Bear Lake River, but with larger veins of calc-spar.

63, 64 Dark blackish-brown bituminous shale, veined with calc-spar, and
passing into bituminous marl-slate. It contains nodules of iron pyrites.

65 Thin bed of indurated shale, approaching to flinty-slate, lying at
the foot of some beds of bituminous limestone. Their connection not
clearly made out.

66, 67, 68 Bluish-gray, fine-grained sandstone, some of them passing
into slate-clay, and scarcely to be distinguished from those at the
rapid in Bear Lake River. Capt. Franklin took these specimens from
horizontal beds at the foot of the hill facing Bear Lake River.

[28] Sir Alexander Mackenzie, in p. 95 of his Voyage to the Arctic Sea,
states, that he saw several small mineral springs running from the foot
of this mountain, and found lumps of iron ore on the beach.

[29] Travels in the Arkansa, p. 52-54.

[30] Section I.

The section of the bank at the mouth of the Bear Lake River
is as follows, beginning with the lowest bed:--

81 Gravel, with thin layers of sand rising from the water's
edge in a perpendicular cliff, to the height of 30 feet
Lignite (70 to 80 and 84) 1
83 Potter's clay of a bluish gray colour, alternating
with layers of sand 40
A sloping uneven brow, covered with soil, extends
to the summit of the bank 20
----
91

Lydian stone is the most abundant, and whitish quartz the least so of
the pebbles mentioned in the text as entering into the composition of
the gravel.

[Sidenote: 82] A little farther up the Mackenzie, this bed of gravel
passes into sand, which, in some spots, has sufficient coherence to
merit for it the name of sandstone. During a great part even of the
summer season, all the beds of