Thanks guys, I am glad it means something to someone else, other than me.
It was at the end of a long day walking around Yellowstone, after all other, much more famous vistas, when this simple scene, tucked into a quiet corner, barely noticeable by most who are rushing back to the lodge or their cars, struck me as so timeless, so millions of years ago, so... well, primordial. And scary beautiful.
NOTE: Just remembered that the whitish forum background tends to render the image appear darker and with less detail in the shadows. If it is not too much trouble, clicking on it will take you to Flickr, where just one more click would bring you a larger version on a clean black background.