  The particle dynamics and shear forces of granular matter in a Couette
geometry are determined experimentally. The normalized tangential velocity
$V(y)$ declines strongly with distance $y$ from the moving wall, independent of
the shear rate and of the shear dynamics. Local RMS velocity fluctuations
$\delta V(y)$ scale with the local velocity gradient to the power $0.4 \pm
0.05$. These results agree with a locally Newtonian, continuum model, where the
granular medium is assumed to behave as a liquid with a local temperature
$\delta V(y)^2$ and density dependent viscosity.
