THE MEDITERRANEAN LOWER CRETACEOUS

CONTENTS
PREFACE
Part One. INTRODUCTION 9
I. General Remarks about the Lower Cretaceous 9
1. Nomenclature 9
2. Boundaries of the Lower Cretaceous 9
2.1. Lower Boundary 1°
2.2. Upper Boundary 1°
2.3. Radiometric Data 1°
3. Material 13
II. Stages, Substages and Biostratigraphic Z'-nes in liie Lower Cretaceous 13
1. General Remarks 13
2. General Characteristic о Г the Stages 14
2.1. Berriasian . . 14
2.1.1. Biostratigraphic Zones 15
2.2. Valancinian '9
2.2.1. "Substages •. 21
2.2.2. Biostratigraphic Zones 21
2.1. Hauterivian 23
2.3.1. Substages 23
2.3.2. Biostratigraphic Zones 24
2.4. Barremian 26
2.4.1. Substages 28
2.4.2. Biostratigraphic Zones 28
2.5. Aptian . . . 30
2.5.1. Substages 31
2.5.2. Biostratigraphic Zones 31
2.6. Albian 34
2.6.1. Substages 36
2.6.2. Biostratigraphic Zones 36
Part Two. REGIONAL STRATIGRAPHY 40
III. Rcgional-Stratigraphie Characteristics of the Lower Cretaceous 40
1. Bulgaria 40
1.1. General Notes 40
1.2. Accepted Stratigraphie Schemes 43
1.2.1. General Remarks 43
1.2.2. Bio- and Chronostratigraphic Units 43
1.2.3. Lithostratigraphic Units Related to the Lower Cretaceous in Bulgaria 43
1.3. Rcgional-Stratieraphic Characteristics 44
1.3.1. Kraiste 44
1.3.2. Western Bulgaria 45
1.3.3. South Carpathians (Kula region) 47
1.3.4. The Fore-Balkan 48
1.3.5. The Moesian Platform 67
1.3.6. Eastern Rhodopes 80
2. Northwestern Africa 81
2.1. Morocco 81
2.2. Continental Margin of Nortwestern Africa 85
3. Northern Africa 87
3.1. Algeria 87
3.2. Tunisia 93
265