huge size.

Exhume, to dig out of the ground, or in the case of a fossil, to take
out of its place of burial in the rock.

Faulted, interrupted continuity of rock strata by displacement
along a plane of fracture, generally caused by an earthquake.

Formative, the era of the birth and growth of the earth out of the
spiral nebula of the sun, the beginnings of the atmosphere and
hydrosphere, and of the continental platforms and ocean basins.

Fossil, the remains of plants and animals of prehistoric times, now
found embedded in the rocks.

Psychozoic, the era of man, including the time during which man
attained his highest civilization (perhaps the past 30,000
years), to the present.

Geology, the history of the earth as read in the rocks.

Geyser, a boiling spring which periodically sends forth jets of water,
steam and gas.

Glacier, a slow moving river of ice, remnant of the last ice age,
generally found flowing down the mountain peaks.

Granite, a granular rock consisting of quartz, mica and feldspar,--the
material of the original crust of the earth.

Gypsum, the mineral from which plaster of Paris is made.

Ichthyosaurus, an extinct fishlike reptile of huge size.

Igneous, produced by the action of fire (i.e., a rock).

Jurassic, that period of the Mesozoic era that gave rise to birds and
flying reptiles.

Lava, the melted rock ejected by a volcano.

Limestone, a rock due in the main to the accumulated debris of plants
and animals, especially to the shells of marine animals.

Lithosphere, the rocky crust of the earth.

Mesozoic, the era of reptile dominance, in which occurred the rise of
dinosaurs, birds and flying reptiles, flowers and higher insects, and
primitive mammals.

Metamorphic, recrystallized by heat (i.e., a rock), or changed by
pressure.

Metamorphose, to change into a different form.

Miocene, that period of the Cenozoic era when apes were transformed
into man.

Paleozoic, the era of fish dominance, in which occurred the first
abundance of marine animals, the first known fresh-water fishes, the
first known land floras, the first known amphibians, the first insects
and the first accumulations of coal.

Proterozoic, the age of invertebrate dominance, containing an
early and a late ice age.

Reconnaissance, a preliminary survey.

Scarp, declivity.

Shale, a fine-grained, layered, sedimentary rock, generally easily
crumbled.

Silica, a form of quartz.

Stalactite, a penda