The North American craton actually dips near the Rockies rather than forming a sharp vertical step as previously believed.

This is a preview. Log in through your library . Abstract The middle—upper Miocene (Serravallian-Tortonian) Gatun Formation of Panama is one of the most diverse marine fossil assemblages in the ...

The Cooperative National Geologic Map offers a complete and detailed look at the bedrock and fault systems of the continental United States. The first geological map of the United States was published ...

Two low-flying Piper Navajo airplanes are scheduled to begin crisscrossing north Arkansas this week measuring variations in the Earth's natural magnetic field, as well as soil and rock chemistry on ...

HUMAN bones from time to time have been discovered associated with those of extinct hyenas and cavern-bears, and specimens of them were in the Museum of the Garden of Plants in Paris as long ago as ...