An extensional duplex consisting of fault-bounded blocks (horses) located between low-angle normal faults is exposed in Proterozoic strata in the Purcell Mountains of British Columbia, Canada. This is one of the rust documented extensional duplexes, and it is geometrically and kinematically analogous to duplexes developed in contractional and strike-slip fault systems, The duplex formed within an extensional fault with a ramp and flat geometry when horses were sliced from the ramp and transported within the fault system.

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