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_  Dl Introduction. 1 Cretaceous System. 6 Yauco Mudstone___---___-___-_-_6 Maricao Basalt 7 Rio Blanco Formation-____ 7 Tertiary System... 10 Concepci6n Formation 10 Mal Paso Formation-_-_-__--___-_-__---11 Rio Culebrinas Formation-_12 Discussion. 15 References cited..- 16

Cretaceous and lower Tertiary stratigraphy in northwestern Puerto Rico