The Big Obsidian Flow is the youngest lava flow in Newberry National Volcanic Monument. It looks pretty big from the top of Paulina Peak but up close it is even more impressive. Over 170 million cubic yards of obsidian and pumice erupted from a vent at Newberry Volcano only about 1,300 years ago. This picture was taken at about the midpoint of the trail acsending the Flow's face.