Closeup (1:4) of sclerenchyma bundle structures in petrified palmwood cross section.
Extreme closeup (1:1) of sclerenchyma bundle structures in petrified palmwood cross section.
Location: listed as 7 miles west of San Antonio on Castroville Road on banks of Leon Creek Chemical Analysis lists samples as 3 to 18% Phosphoric Acid (see ref. below) Specimen Size: 2.25 x 2.25 x 1 inches Specimen Weight: 100 grams in the Jackson School Collection at the University of Texas at Austin. Collection Reference: TMM2732. Additional Information: Numerous references to phosphatic sandstone at this location, including: Bulletin of the University of Texas No. 365, Scientific Series No. 29, October 15, 1914, "The Mineral Resources of Texas", by William B. Phillips (available online at: https://books.google.com/books?id=ma1RAAAAMAAJ)
