Russ, J/ Kaluarachchi, WD/ Drummond, L/ Edwards, HGM 1999: The nature of a whewellite-rich rockcrust associated with pictographs in southwestern Texas. - Studies in Conservation44(2): 91-103. [RLL List # 187 / Rec.# 23357] Keywords: CRUSTOSE/ MAN-MADE SUBSTRATES/ TEXAS/ WHEWELLITE
Abstract: 12 fig. ["We present evidence for a lichen source of the whewellite, mainly fossil microstructures observed in the crust and a logical correlation between dry climate conditions and oxalate production."]