George E. Avery, Stephen F. Austin State University, Nacogdoches, Texas
Geophysical Survey techniques such as ground penetrating radar, magnetometer, electronic resistance, and electro-magnetic susceptibility were used on Spanish Colonial sites of Mission Dolores in San Augustine, Texas, and Los Adaes (Fort and Mission) in Robeline, Louisiana. Both sites were occupied from 1721-1773. Los Adaes was also the capital of the Province of Texas. Sometime the geophysical survey worked great—sometimes it didn’t work so well. I do not regularly work the machines on the sites. I go on what the experts tell me. Overall, in the last 20 years there has been a rise in geophysical survey being done on archaeological sites. As the techniques get easier and less expensive to use, they are used more frequently. I was the archaeologist who did the ground-truthing excavations designed to test the anomalies found by the geophysical surveys, and I will also discuss the features and artifacts found during these excavations.