Tag: igneous rock
Posted on February 6, 2015
Lava Rocks
A dark, shiny object caught my eye as it fell out of its hiding place, a small cavity in a fossil. The smooth, lightweight object was vastly different from the raggedly worn and delicate fossils in the donated …
Posted on January 30, 2015
Underground Rocks
I tightened my grip on the raft as a sudden splash of icy brown water made me shiver in spite of the Arizona afternoon sunshine. The light gleamed off the shiny black rock columns towering up the deep …
Posted on October 6, 2013
Grand Canyon: Rock Dating
The Grand Canyon is both a geologist’s dream and a geologist’s nightmare. It’s a geologist’s dream because it’s not just a bunch of sediment rock layers (like sandstone and limestone), but it also has hardened lava flows and …
