  In this paper, we investigate the microscopic dynamics of a polymer of length
$N$ translocating through a narrow pore. Characterization of its purportedly
anomalous dynamics has so far remained incomplete. We show that the polymer
dynamics is anomalous until the Rouse time $\tau_{R}\sim N^{1+2\nu}$, with a
mean square displacement through the pore consistent with
$t^{(1+\nu)/(1+2\nu)}$, with $\nu\approx0.588$ the Flory exponent. This is
shown to be directly related to a decay in time of the excess monomer density
near the pore as $t^{-(1+\nu)/(1+2\nu)}\exp(-t/\tau_{R})$. Beyond the Rouse
time translocation becomes diffusive. In consequence of this, the dwell-time
$\tau_{d}$, the time a translocating polymer typically spends within the pore,
scales as $N^{2+\nu}$, in contrast to previous claims.
