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. Fl Introduction- 1 Nomenclature. 3 Geologic setting. 4 Stratified rocks north of the Leprocomio fault--____--_-_8 Unnamed volcaniclastic rocks. 8 Tabonuco Formation 8 Barrazas Formation 16 Hato Puerco Formation.__ 17 Cambalache Formation 22 Definition and stratigraphic relationships. 22 Lithology 23 Volcanic breccia. 23 Volcanic sandstone and mudstone..-.25 Mudstone slabs 25 Toma de Agua Vitrophyre Member. 26 Secondary minerals 26 Age and correlation. 27 Can6vanas Formation 27 Martin Gonz&lez Lava. 30 Frailes Formation. 33 Definition and stratigraphic relationships.--_--_---_ 33 Lithology--_-___-34 Lower part. 34 Middle part.. 35 Lava members 36 Leprocomio Mudstone Member 36 Conditions of deposition 37 Age and correlation-_-__37 Monacillo Formation 38 Definition and stratigraphic relationships---_----__ 38 Lithology--___ 39 Lower part._. _ 39 Trujillo Alto Limestone Member. 39 Cretaceous-Tertiary disconformity-___--_--39 Correlation and age-----____--___-___-__-____-__40 Guaracanal Formation,.. __ 40 Stratified rocks between the Leprocomio and Cerro Mula faults. 42 Hato Puerco Formation___---___--__-_----_----42 Infierno Formation.._.____..___. _ 42 Celada Formation..__-_-_-_ 44 Lomas Formation 46 Stratified rocks south of the Cerro Mula fault.._-_-__---_-48 Rio Orocovis Group Los Negros Formation.---_-48

Cretaceous and lower Tertiary stratigraphy of the Gurabo and El Yunque quadrangles, Puerto Rico