Category Archives: outcrops

The Driftless Area: Fewer glaciers but more topography than the rest of Minnesota

Posted on November 30, 2010 by Anne Jefferson

Tucked into the corner where Minnesota, Wisconsin, and Iowa meet there’s a special area with a Quaternary history that sets it apart from the rest of the northern United States. At the Last Glacial Maximum, the Des Moines lobe lay … Continue reading →

Categories: by Anne, geomorphology, outcrops, Pleistocene

Oregon’s fossil forests

Posted on October 13, 2010 by Anne Jefferson

Today is National Fossil Day, and half way through Earth Science Week. In honor of the occasion, I present a few notes and photos from a trip I took with my botanist mother to the John Day Fossil Beds in … Continue reading →

Categories: by Anne, Cenozoic, fossils, outcrops

The fault that made a mountain range

Posted on September 8, 2010 by Chris Rowan

How the Teton Range and the Teton Fault are essentially the same thing. Continue reading →

Categories: geology, geomorphology, outcrops, photos, structures

Yellowstone: where did all the ash go?

Posted on August 11, 2010 by Chris Rowan

Another mark of eruptions at Yellowstone: thick layers of ash stretching across most of the continental US. Continue reading →

Categories: outcrops, volcanoes

Glacial deposits new and old in the Scottish isles

Posted on August 5, 2010 by Chris Rowan

Islay – one of the birthplaces of the Snowball Earth. And good whisky. Continue reading →

Categories: deep time, geology, outcrops, past worlds, photos, Proterozoic, rocks & minerals