[Conglomerate]—a [sedimentary rock] composed of rounded, water-worn gravel, usually mixed with sand, and cemented together by another [mineral] substance.
[Coprolite]—the fossilized excrement of animals.
[Eolian]—pertaining to the erosion and the deposits resulting from wind action and to [sedimentary rocks] composed of wind-transported material.
[Epoch]—a subdivision of a geologic [period], such as the [Pliocene] [Epoch] of the Tertiary Period.
[Era]—a major division of [geologic time]. All geologic time is divided into five eras: the [Archeozoic], [Proterozoic], [Paleozoic], [Mesozoic], and [Cenozoic] Eras.
[Fluorescence]—luminescence of a [mineral] during exposure to radiation (such as from ultraviolet or X-rays).
[Fluvial deposit]—[sediment] deposited by streams.
[Formation]—a [rock] unit useful for mapping and distinguished primarily on the basis of lithologic character.
[Fossil]—any remains or traces of plants or animals preserved in deposits of a past [geologic age].
[Geode]—a hollow stone, usually lined or filled with [mineral] matter.