Transactions of the 3rd Caribbean Geological Conference

TABLE OF CONTENTS

The Bartlett Fault System: Age and Offset - A.A. Meyerhoff . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Higher Level Erosion Surfaces in the Caribbean - J.D. Weaver . . . . . . . . . . . . . . . . . . . . . . . . . 10

Tectonic Si~niricance of thc Spilite-Karatophyre Association - T.W. Donnelly. . . . . . . . . . . . . 13

A Cross-Section through the Northern Range of Trinidad - K. W. Barr . . . . . . . . . . . . . . . . . . . 27

Lithology and Tectonic Implications of Upper Cretaceous Clastic Volcanic Rocks
Northeast Puerto Rico .... Henry L. Berryhill, Jr. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Some Volcanic Rocks of the Corozal Quadrangle, Puerto Rico -A.E. Nelson .. . . . . . . . . . . . 41

Unconformity between Cretaceous and Eocene Rocks in Central Puerto Rico
Peter H. Matson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49.

Stratigraphic Relations and Sedimentation of the Oligocene and Miocene Formations
of Northern Puerto Rico - Watson H. Monroe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

The Blanket Sands of Northern Puerto Rico ....Reginald P. Briggs . . . . . . . . . . . . . . . . . . . . . .60

Some Remarks on the Origin of the "Nipe Clay" in Puerto Rico ..J D. Weaver . . . . . . . . . . . . .70

Eocene Limestones in Eastern Jamaica....E. Robinson .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Les Formations Cenozoiques de la partie Mexicaine de la Presqu'ile du Yucatan
Jacques Butterlin et Federico Bonet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Orogenesis in Central America ..Richard Weyl .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Regional Hydrogeology of El Salvador, C.A.. - Dietrich Seeger .. . . . . . . . . . . . . . . . . . . . . . .95

Progress Report. United Nations Groundwater Exploration Project in El Salvador,
C.A. David H. Wozab and Paul F. Patcbick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

Fluctuations of ground~vater Levels in Puerto Rico Resulting from Earthquakes
(1959- 19fil) - I.G. Grossman . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

Some Characteristics of Copper Mineralisation in Puerto Rico - Maurrice H. Pease, Jr.. . . . . .107

Geochemical prospecting for Copper in Puerto Rico ..- W.R. Bergey . . . . . . . . . . . . . . . . . . .113

Industrial and Mineral Development in Puerto Rico ..José F. Cadilla . . . . . . . . . . . . . . . . . 120

Geology and Ore Occurrences at Mavis Bank, Parish of St. Andrew, Jamaica, W.l.
Richard J. Per~eli... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122

Marble at Mt. Hibernia, Jamaica .- D.L. Cooke and B.V. Bailey . . . . . . . . . . . . . . . . . . . . . .123

A Rapid Chemical Method for the Grading of Bauxite .. V.G. Hill and Desmond Price . . . . . 129

Geological Background to Soil Conservation and Land Rehabilitation Measures in Barbados, W.I..P. Martin-Kaye and J. Badcock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Some General Geologic Aspects of the Precambrian of Southem Venezuela
G.C. McCandless.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Sur la Metallogenie du Bassin du Maroni .. C.G. Brouwer . . . . . . . . . . . . . . . . . . . . . . . . 140

Some Aspects of the Geology of the Roraima Formation in British Guiana - J.H. Bateson . 144

Notes on the Erosion Levels and Geomorphology of British Guiana R.B. McConnell . . . . . 151

Upper Cretaceous Radiolaria from Puerto Rico ..Emile A. Pessagno, Jr... . . . . . . . . . . . . . . . 160

Rudists as Index Fossila .- L. J. Chubb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Forme Originelle et Place des Formes a Replis Multiples dans un Plan General deClassification des Hippuritides .. Pierre Senesse .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .172

Variability of Certain Tertiary Larger Foraminifera .....K.N. Sachs, lr.. . . . . . . . . . . . . . . . . . 176

The Distribution and Variation of Living Pelagic Foraminifera in the Caribbean J.I. Jones . 178

TwoCrabSpecies from the Middle Tertiary of Puerto Rico ..-.W.A. Gordon .. . . . . . . . . . . . . 184

Diagram Fig. 2........Henry Berryhill Jr. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187