Dimples in the flatiron reefs of rock deep within Denali National Park tell stories of hundreds of dinosaurs from the Late Cretaceous Period milling about a large floodplain, heading perhaps to a watering hole.

A small lake near Norris Geyser Basin has seen some significant changes over the past few years, rising in level and changing color due to inputs of thermal water from nearby hot springs.

A search was underway Monday in Sequoia National Park for a 76-year-old California man on his first solo overnight backpack trek who failed to meet his family as planned last week.

Understanding the eruptive history of volcanoes in Hawaii requires a tremendous amount of time and effort examining deposits. Typically, older eruptions have less material exposed at the surface because younger eruptions bury them, or wind and rain erode them. Such is the case for one of Kīlauea’s largest explosive eruptions, which is not exposed near its source at the summit and must be studied further afield.