Modern continental rocks carry chemical signatures from the very start of our planet's history, challenging current theories about plate tectonics.

A strange rock covered in tiny spheres may hold secrets to Mars’ watery — or fiery — past.

Anderson will share some of his stories at the Gem, Mineral & Fossil Show – put on by the Black Hawk Gem & Mineral Society – at the Waterloo Center for the Arts, 225 Commercial St., on Sunday. The ...