title: A chronological record of environmental chemicals from analysis of stratified vertebrate excretion deposited in a sheltered environment.
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D000818:Animals; D001130:Arizona; D002617:Chemical Industry; D002685:Chiroptera; D003300:Copper; D005243:Feces / Q000032:analysis*; D008433:Mathematics; D008628:Mercury / Q000032:analysis*; D013997:Time Factors
chemical_list: D003300:Copper; D008628:Mercury