Earth Science, Geologic Time & Fossils

Psittacosaurus

dinosaur genus

Catastrophism

geology

Platyceras

fossil snail genus

Tectonics

geology

Andalusite

mineral

Marine Geology

Arctolepis

placoderm genus

Geomorphic Cycle

Soil Chemistry

Dip Circle

scientific instrument

Tertiary Period

Events, Climate, & Organisms

Ijolite

rock

Haboob

wind storm

Acanthite

mineral

Anthrosol

FAO soil group

Cavendish, Thomas

English navigator and explorer