Saturday, June 26, 2010

iPhone Diary Series

iPhone Diary: 25 June 2010                                                   

Friday, June 25, 2010

iPhone Diary Series

iPhone Diary: 24 June 2010

Wednesday, June 16, 2010

Louisiana Road Trip

Geology Lesson                                                
The 20 miles of [Highway 165] north of Alexandria cross sediments of the Upland Complex, now eroded into low hills. Many small erosion cuts along this stretch expose sandy sediments in shades of tan and orange, the characteristic material of the Upland Complex.

Between the area five miles south of Georgetown and Tullos, the road rolls up and down across the valleys of Bear Creek, Dugdemona River, and Castor Creek, which slice through sediments of the Prairie Complex exposed on the hilltops. Georgetown stands on the higher elevations of the Prairie Complex. Tullos is at the northern margin of a band of rocks that trend from northeast to southwest, part of the Jackson group of late Eocene formations. All you see of them are patches of pale tan sand next to the road in Tullos. The formation typically includes clays interlayered with thin beds of lignite coal, sands stained red and brown by iron oxides, and fossil beds.

--Darwin Spearing, 2007
Roadside Geology of Louisiana, Second Edition

Friday, June 11, 2010

Louisiana Road Trip

Between a Rock and a Hard Place