Big Chico Creek carves a canyon through basalt rocks in Upper Bidwell Park, Chico, California, USA.

Big Chico Creek carves through a Miocene basalt canyon near the Diversion Dam in Upper Bidwell Park, in the foothills of the southernmost Cascades, Chico, California, USA. Its Lovejoy Basalt rocks formed from very-fluid lava flows 18 to 19 million years ago. Photographed December 2018. This image was stitched from multiple overlapping photos.