Some twenty-nine million years ago two tectonic plates, the North American and the Pacific, scraped against each other. The result was the creation of a geologic feature known as a rift valley, a separation of the Earth’s crust caused by faulting. Across this separation the ancient Rio Grande River has worn a tectonic chasm, slicing through the basalt flows of the Taos Plateau volcanic field. At its deepest, the Rio Grande Gorge reaches eight hundred feet, producing a truly unique eco-system that is home to forests containing five-hundred-year-old junipers and pinons. Last year the gorge became part of the new Rio Grande del Norte National Monument, a wonderful way of preserving this beautiful place. We arrived at the gorge about 8:30 a.m., a half-hour after sunrise on an intermittently cloudy morning, which created a soft contrast as the highlights and shadows danced across the land, illuminating first one area and then another. I chose to face upstream at first, from a place on the western approach to the Rio Grande Gorge Bridge, so that the highlights would come and go on the left side of chasm (and the image), leaving the right side in relative shade. In this way the highlights formed an arc around the shadow area, which I particularly liked. There was a bare vertical wall in the near ground and I waited for a highlight to brighten it and its surrounding slopes. I did not want to have any sky to distract from the scene below, so I cut off the top of the image just above the edge of the rim; and I used the turn of the river to create a diagonal through the frame that ended in an arced C-curve at the top of the ccomposition. A short telephoto focal length of 90mm gave me the angle of view I wanted. An aperture of f/20 gave me sufficient depth-of-field; and a shutter speed of 1/6th second at ISO 100 gave me an overall slightly darker-than-medium exposure.