Rocks that reveal conditions of early Earth main content.

Rocks that reveal conditions of early Earth

Part of Hall of Planet Earth.

Exhibition Text

Clues to the conditions on the early Earth are found in rocks like the Huronian Supergroup, a set of sedimentary rock formations, up to 12 kilometers thick, laid down between 2.5 and 2.2 billion years ago. The rocks are exposed just north of Lake Huron, Canada. Many geologists believe that this sequence of rocks records a change from an oxygen-free to an oxygen-bearing atmosphere.

For Educators

Topic: Earth Science

Subtopic: Atmosphere

Keywords: Geology, Stratigraphic--Huronian, Huron, Lake (Mich. and Ont.), Canada, Atmosphere, Paleoclimatology

Audience: General