nt cone of calcium carbonate deposited by dripping
water (as in a cave).

Stalagmite, a deposit (on the floor of caves) resembling an inverted
stalactite.

Strata, layers of rock or earth.

Striated, marked with fine grooves or lines of color.

Triassic, the period that gave rise to dinosaurs.

Triceratops, a fossil giant lizard.

Uplift, an upheaval of rock strata.

-----------------------------------------------------------------------

KEY TO GEOLOGIC TIME

Archeozoic era. (Protoplasms.)

Proterozoic era. (Invertebrates.)

Paleozoic era. (Fish.)
Cambrian period.
Ordovician period.
Silurian period.
Devonian period.
Mississippian period.
Pennsylvanian period.
Permian period.

Mesozoic era. (Reptiles.)
Triassic period.
Jurassic period.
Comanchean period.
Cretaceous period.

Cenozoic era. (Mammals.)
Oligocene and Eocene time
Pliocene and Miocene time.
Pleistocene time.

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