Drought uncovers dinosaur tracks in US park

A drought in Texas dried up a river flowing through Dinosaur Valley State Park, exposing tracks from giant reptiles that lived some 113 million years ago, an official said Tuesday.

The magical California state park that doesn't allow visitors

About 60 miles north of Sacramento, the Sutter Buttes rise starkly from the floor of the Central Valley, the remnants of a volcano active more than 1.4 million years ago. Their cathedral-like spires twist upward, some reaching ...

Invasive species are taking over Ohio forests

A new botanical survey of southwest Ohio found that invasive species introduced to the United States over the past century are crowding out many native plants.

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