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We use plate drag to study the response of granular media to localized forcing as a function of volume fraction, ϕ. A bifurcation in the force and flow occurs at the onset of dilatancy, ϕ_c. Below ϕ_c rapid fluctuations in the drag force, F_D, are observed. Above ϕ_c fluctuations in F_D are periodic and increase with ϕ. Velocity field measurements indicate that the bifurcation in F_D results from the formation of stable shear bands above ϕ_c which are created and destroyed periodically duringdoi:10.1103/physrevlett.105.128301 pmid:20867678 fatcat:s2qkkgw7tjad3bmpmbe7gq3r3e