Introduction / F.M. Gradstein -- Chronostratigraphy : linking time and rock / F.M. Gradstein, J.G. Ogg and A.G. Smith -- Biostratigraphy : time scales from graphic ...

What are some events that all of us have had in our lives? Ask the class "What are some events that all of us have had in our lives?" Make a list of 5 or 6 things on the board. Let’s organize these!

A geologic map is made to show the reader information about the geological formations of the land, including detailed ...

Bruce Bjornstad has loved rocks since he was a kid, growing up on the East Coast. But his real love and expertise is the Missoula Floods — cataclysmic events that scoured the Columbia Basin and laid ...

A new analysis of rocks thought to be at least 2.5 billion years old helps clarify the chemical history of Earth's mantle -- the geologic layer beneath the planet's crust. The findings hone scientists ...