I don't recognize the name either. The article below mentions chipicil slabs. The STAA library is at the University of Texas at San Antonio Center for Archeological Research. I would try to get the article from CAR or ask Tim Perttula directly. 
 
Record 673
Perttula, Timothy K. "The Historic Ranchos at Falcon Reservoir on the Rio Grande." La Tierra, Volume 30 No. 3&4. Southern Texas Archeological Association
Summary: A documentation and discussion of the preserved architectural lay out of some of the 18th-20th century ranchos in Zapata & Starr Co.
 
 
Barbara J Hickman, Staff Archeologist
Archeological Studies Program
Environmental Affairs Division
Texas Department of Transportation
125 East 11th Street
Austin TX 78701
Telephone: 512.416.2637
Fax: 512.416.2680
 

 

===================
Hurricane Season:
Hurricane season is underway. 
Do you have a Personal Plan for your family’s safety?
Visit www.txdot.gov/travel/hurricane.htm