Flora, the complete system of vegetable species native in a given locality, or period.
Fluor-spar, a mineral of beautiful colors, composed by fluorine and calcium.
Fluvio-marine, the deposits formed by the joint action of a river and the sea.
Foramen, a little opening.
Fossa, a depression in a bone.
Fossil, the form of a plant or animal in the strata composing the surface of the earth.
Genus (pl. genera), an assemblage of species possessing certain characters in common, by which they are distinguished from all others.
Geode, an irregular shaped stone, containing a small cavity.
Geognostic, pertaining to a knowledge of the structure of the earth.
Glabella, the middle or frontal protuberance of the superciliary arch.