William R. Carr|Lee F. Elliott|Lisa Williams|Debbie Benesh
23713
2005-03-16
2005-3-16
United States, Texas, Webb, On TreviƱo Ranch (30-35 miles NNW of Laredo). SE side of Arroyo Grande a mile or less upstream from its mouth at the Rio Grande, SW tip of ranch. Palafox SW Quadrangle.
27.86231 -99.88475
Rare noted only among outcrops of Eocene sandstone of Bigford Formation in steep rocky N-facing slope.