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has done more to advance and apply sedimentology than any other branch of industrial geology. Critical readers will notice that metres, feet, kilometres, and miles are used indiscriminately throughout the book. Since the oil industry refuses to go metric, the student must quickly learn to correlate the two systems. A conversion scale is included in the first figure. January, 1970 RICHARD C. SELLEY Tripoli, Libya Preface to the second edition I began to write the first edition of this book after spending nearly ten years at university studying and teaching how to diagnose the depositional environments of sedimentary rocks where they crop out at the earth's surface. The first edition was written during the first three months of my five-year sabbatical in the oil industry. From then on a very large part of my time has been spent learning how to diagnose the environments of sediments from bore holes in the sub-surface. This is a far more challenging occupation for there are fewer data, the techniques are quite different, and the economic implications may be immense. The new edition reflects this experience. The introductory chapter includes a -discussion of the techniques of sub-surface facies analysis, and subsequent chapters discuss the criteria by which each environment may be recognized in the sub-surface. Most of the chapters have been modified in one way or another; sections on modern environments have been expanded and some of the case histories have been extensively modified and, for the Captain 'reef', completely rewritten.

Ancient Sedimentary Environments and their sub-surface diagnosis

1 Introduction.- Sedimentary environments and facies.- Relationship between facies, sequences and stratigraphy.- Methods of environmental diagnosis.- Geometry.- Lithology.- Sedimentary structures.- Palaeocurrent patterns.- Fossils.- Sub-surface environmental interpretation.- Interpretation of vertical grain size profiles from geophysical logs.- The use of the dipmeter in sub-surface facies analysis.- Summary.- References.- 2 River Deposits.- Introduction: Recent alluvium.- Alluvium of meandering rivers.- Alluvium of braided rivers.- The Torridon Group (PreCambrian) of northwest Scotland: description and discussion.- Basal facies: description.- Basal facies: interpretation.- Grey facies: description.- Grey facies: interpretation.- Red facies: description.- Red facies: interpretation.- Devonian sediments of south Wales and the Catskill Mountains, USA: description.- Devonian sediments of south Wales and the Catskill Mountains, USA: interpretation.- Discussion.- Economic aspects.- Sub-surface diagnosis of fluvial deposits.- Sub-surface diagnosis of braided fluvial deposits.- Sub-surface diagnosis of meandering fluvial deposits.- References.- 3 Wind-Blown Sediments.- Recent eolian sediments.- Eolian deposits of Western USA: description.- Eolian sandstones of Western USA: discussion.- General discussion of eolian sediments.- Economic significance of eolian deposits.- Sub-surface diagnosis of eolian deposits.- References.- 4 Lake Deposits.- Recent lakes.- The Green River Formation (Eocene) Rocky Mountains, USA: description.- Green River Formation: discussion of environment.- General discussion of ancient lake deposits.- Economic aspects.- Sub-surface diagnosis of lacustrine deposits.- References.- 5 Deltas.- Shorelines: a general statement.- Recent deltas.- Carboniferous deltaic sedimentation of Northern England.- Type 1: description.- Type 1: interpretation.- Type 2: description.- Type 2: interpretation.- General discussion of deltaic sedimentation.- Economic significance of deltaic deposits.- Sub-surface diagnosis of deltaic deposits.- References.- 6 Linear Terrigenous Shorelines.- Introduction: Recent linear terrigenous shorelines.- Cretaceous shorelines of the Rocky Mountains, USA: description.- Coal-bearing facies.- Sheet sand facies.- Laminated shale facies.- Cretaceous shorelines of the Rocky Mountains, USA: interpretation.- General discussion of linear terrigenous shorelines.- Economic significance of linear terrigenous shorelines.- Regressive sand sheets.- Transgressive sand sheets.- Shoestring barrier sands.- Sub-surface diagnosis of barrier sands.- References.- 7 Mixed Terrigenous: Carbonate Shorelines.- A Libyan Miocene shoreline: description and discussion.- Skeletal limestone facies.- Laminated shale facies.- Interlaminated sand and shale facies.- Cross-bedded sand and shale facies.- Calcareous sandstone channel facies.- General discussion of the Miocene shoreline of the Sirte basin.- General discussion and economic aspects.- References.- 8 Shelf Deposits: Carbonate and Terrigenous.- Introduction: a general theory of shelf sea sedimentation.- Mississippian (Lower Carboniferous) deposits of the Williston basin, North America: description.- Charles facies.- Mission Canyon facies.- Lodgepole facies.- Mississippian (Lower Carboniferous) sediments of the Williston basin, North America: interpretation.- Discussion of carbonate shelf sediments.- Terrigenous shelf deposits.- Economic aspects.- Sub-surface diagnosis of shelf deposits.- References.- 9 Reefs.- Summary of Recent reefs.- Permian reefs of West Texas: description.- Permian reefs of West Texas: discussion.- Leduc (Devonian) reefs of Canada: description.- Leduc (Devonian) reefs of Canada: interpretation.- The Bu Hasa reef oil field, Abu Dhabi: description.- The Bu Hasa reef oil field, Abu Dhabi: interpretation.- General discussion of reefs.- Factors controlling reef geometries and facies.- The reef: evaporite: euxinic shale association.- Diagenesis of reefs.- Econom