Petrified logs and stumps are exposed along the shores of Unga Island, an otherwise treeless place. The petrified forest, much of it below the tide line, covers about five miles of beach. On a sunny day, the petrified tree stumps stand out white and bright against the gray-black beach rock. The stumps range in diameter from a couple of feet to about 9 feet across.These are remnants of a sequoia forest buried as a result of volcanic activity in the Tertiary Period, so 2.6 to 66 million years ago. Unga Island is the largest of the dozen or so Shumagin Islands, about 570 miles southwest of Anchorage near the tip of the Alaska Peninsula.The site is part of the Alaska Maritime National Wildlife Refuge. Read more here and here. Click here to download the CoastView app and explore more of Unga Strait and the Shumagin islands.