Abstract
A historical review of the study of slaty cleavage is presented. It is found that a first period of research, culminating in Harker's 1885 Report, produced concepts and proven facts that still remain the basis of modern interpretations of slaty cleavage. Subsequent research, with a few notable exceptions, has resulted only in additional detailed knowledge, gained partly as a consequence of modern technology. It has also produced an unfortunate series of ill-conceived ideas and an amazingly complex terminology, with the result that modern textbooks range from being lamentably confusing to refreshingly lucid on this topic. With renewed interest in finite strain analysis and greater appreciation of the progressive nature of geologic deformation, several recent studies, combining methods that have proved rewarding in the past and modern analytic techniques, have rejuvenated the study of slaty cleavage and provide a basis for what could become a further period of profitable research.
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