DENVER — More trees for shade and an extension of the city's urban tree canopy along Denver's iconic 16th Street Mall are being planted as part of the walking mall's decade-long revitalization project ...

Sixty miles east of Winslow, on the windswept plains of the Painted Desert, maroon-colored Triassic fossils recall a forest more than 200 million years old. Felled logs of the ancient conifer species ...