Abstract
The progressive development of slaty cleavage in marly formations can be studied along a traverse through the External Zone of the French Alps between Barcillonnette and Savines. The following changes were found to be associated with the cleavage development: 1. (1) Finite-strain states, measured using deformed fossils. 2. (2) Metamorphic grade, indicated by changes in mineralogy and measured by the crystalinity of illite and the ratio of illite polymorphs 2M 1Md . 3. (3) Textures, seen using the optical and scanning electron microscopes and measured by texture goniometry. 4. (4) Minor structures. The geological history of the area is outlined and a hypothesis for the origin of slaty cleavage in this region is presented.
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