sand are frozen into a hard sandstone;
but a piece having been broken off and put into the pocket, speedily
thawed into sand.

[Sidenote: 83] Specimens of the clay, which I have denominated potter's
clay, taken from near the beds of lignite, have a colour intermediate
between yellowish-gray and clove-brown, a dull earthy fracture, and a
slightly greasy feel. It is not gritty under the knife, and acquires a
slightly shining smooth surface, adheres slightly to the tongue, and,
when moistened with water, assumes a darker colour, and becomes plastic.

Section II.

About five miles above Bear Lake River, the cliff consists
of Slaty sandstone evidently composed of the same materials
with the friable kinds described in the text, but having
tenacity enough to form a building stone. It incloses some
seams of lignite 10 feet
Lignite 4-1/2
Clay and Sand 50
Irregular slope from top of cliff to summit of bank 90
---------
154-1/2

Section III.

A little farther up the river than the preceding:--

85 Pipe-clay on a level with the water 1 foot
86 Lignite 1
90 Potter's clay 14 feet
87 Pipe-clay 1 foot
89 Lignite 1
91 Potter's clay 10 feet
Lignite 1 foot
Sandstone 8 feet
Lignite 2-1/2
Potter's clay 10
94 Friable sandstone and clay 20
Sandstone a little more durable 12
Sloping Summit 40
---------
121-1/2

The pipe-clay, when taken newly from the bed, is soft and plastic, has
little grittin