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Geology and ground-water resources of Medina County, Texas
Charles Lee Roy Holt
1959, Water Supply Paper 1422
The Edwards limestone of Cretaceous age is the principal water-bearing formation in Medina County and makes up the major part of a ground-water reservoir, or aquifier, which in places includes thinner limestone formations both above and below the Edwards. The Glen Rose limestone, also of Cretaceous age, yields moderate amounts...
Occurrences of alunite, pyrophyllite, and clays in the Cerro La Tiza area, Puerto Rico
Fred Adelbert Hildebrand, Raymond J. Smith
1959, Open-File Report 59-54
A deposit of hydrothermally altered rocks in the Cerro La Tiza area located between the towns of Comerio and Aguas Buenas, approximately 25 kilometers southwest of San Juan, Puerto Rico, was mapped and studied to determine the principal minerals, their extent distribution and origin, and the possibility of their economic...