Tag: igneous rock

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… Read More

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… Read More

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… Read More