Spencer G. Lucas

James E. Barrick

Daniel Vachard

Karl Krainer

Bulletin 69

The Pennsylvanian System in the Mud Springs Mountains, Sierra County, New Mexico, USA

Markus Aretz

José Javier Álvaro

Frederic Boulvain

Axel Munnecke

The geological record contains a fascinating diversity of reefs and shell accumulations. As with many other biosedimentary structures, their facies characterization requires careful observation at outcrop and sample scale, and in thin-section to provide information about the global geometries, fabrics and textures respectively. This collection of papers encompasses the breadth of sedimentary geometries and facies displayed by Palaeozoic reefs, shell accumulations, and transitional composite deposits. The definition of reefs and shell concentrations has given rise to variations in nomenclature. The papers in this volume cover specific problems regarding the nomenclature and facies characterization of reefs, shell accumulations and transitional composite deposits. However, rather than attempt a complete revision of terms, the authors have touched on some of the important issues at this stage of development in the field: the main climatic, environmental and evolutionary factors that controlled the Palaeozoic development of shell accumulations and reefs.

Climatic and Evolutionary Controls

Palaeozoic Reefs and Bioaccumulations

Daniel Vachard

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