Selected Publications.

Barker, D. S. (2000) Down to Earth at Tuff Canyon, Big Bend National Park,

Texas. University Texas Bureau of Economic Geology, DE 2, 40 pp.

Barker, D. S. (2000) Emplacement of a xenolith-rich sill, Lajitas, Texas.

Jour Volcanology and Geothermal Research 104: 153-168

Barker, D. S. (2001) Calculated silica activities in carbonatite liquids.

Contributions to Mineralogy and Petrology 141: 704-709