  We present the unique solvability in Sobolev spaces of time fractional
parabolic equations in divergence and non-divergence forms. The leading
coefficients are merely measurable in $(t,x_1)$ for $a^{ij}$, $1 \leq i,j \leq
d$, $(i,j) \neq (1,1)$. The coefficient $a^{11}$ is merely measurable locally
either in $t$ or $x_1$. As functions of the remaining variables, the
coefficients have small mean oscillations. We consider mixed norm Sobolev
spaces with Muckenhoupt weights. Our results generalize previous work on
parabolic equations with time fractional derivatives to a much larger class of
coefficients and solution spaces.
