There are no active geysers or hot springs in the Lamar Valley right now -- at least that I know of -- but this extinct geyser dome is evidence that the area has been geothermally active. The name of this feature comes from its location, near where Soda Butte Creek joins the Lamar River. It is actually very large -- some 20 feet wide -- and chunks of its base are eroding and breaking off (hopefully due to natural, not man-made activities!)
As the orange-red glow of sunset kissed the distant mountains, we heard a wolf pack as I was taking the picture. This is the area where the last wolves once lived in Yellowstone before they were all exterminated -- and is also one of the areas where recently reintroduced wolves have settled.