Welcome to GeoJeff.org

This website serves as a permanent home for communicating various activities.

Software created for biology, geology, and teaching is held in the Software folder.

Course materials I am writing or have written are held in the Course Materials folder.

Photographs, mostly of Nature, are in the Photos folder.

My blog is in the Blog folder.

Spicebush Swallowtail Butterfly, Rush Creek, Big Thicket, East Texas, taken August 18, 2008

Eastern Tiger Swallowtail Butterfly, Big Thicket, East Texas, taken March 19, 2007

This is one of my favorite photographs, taken during a May 2003 trip to the Grand Canyon. This is a view of Hermit Creek, with the canyon of the Colorado River lying in the distance, running right to left across the middle of this scene.