Earth Science, Geologic Time & Fossils

De Geer, Gerhard Jakob, Friherre

Swedish geologist

Cordilleran Geosyncline

geological feature, North America

Cryolite

mineral

Phenacodus

fossil mammal genus

Mesosphere

meteorology

Boracite

mineral

Lithiophilite

mineral

Cobaltite

mineral

Multituberculate

fossil mammal

Rhamphorhynchus

fossil reptile genus

Essexite

rock

Venyukovia

fossil tetrapod

Stagg, James Martin

British meteorologist

Brøgger, Waldemar Christofer

Norwegian geologist

Hayden, Ferdinand Vandiveer

American geologist

Pyrrhotite

mineral