United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873)

United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873)

United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873)

United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873)

United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873)

United States naturalist (born in Switzerland) who studied fossil fish; recognized geological evidence that ice ages had occurred in North America (1807-1873)

The act of making a fold or folds; also, a fold; a doubling; a plication, a geological process that causes a bend in a stratum of rock, adjective_ capable of being folded up and stored, Designed to fold; as a folding bed, a folding chair, etc, verb_ Present participle of fold

An estimation of the age of an artifact, biological vestige, linguistic usage, etc, use of chemical analysis to estimate the age of geological specimens, A form of romantic courtship typically between two individuals with the aim of assessing the other's suitability as a partner in an intimate relationship or as a spouse The result of dating may at any time lead to friendship, any level of intimate relationship, marriage, or no relation, verb_ Present participle of date

geologic, of or relating to or based on geology