Abstract
Some typical and some unusual fault patterns are described from the Ethiopian rift valley. They include arcuate faults convex in plan towards the downthrown side; lines of obliquely tilted, faulted blocks; “Up” horsts; horizontally stratified rhomb horsts athwart tilted strata; faults whose polarity switches in conjunction with development of small horsts; intersecting fault sets; and re-entrant and semi-circular faults. Explanations remain wanting for many of these phenomena, which show that crustal extension can be complex at the meso-scale.
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