  In this paper, we show that circular $(s,t)$-Furstenberg sets in $\mathbb
R^2$ have Hausdorff dimension at least $$\max\{\frac{t}3+s,(2t+1)s-t\} \text{
for all $0<s,t\le 1$}.$$ This result extends the previous dimension estimates
on circular Kakeya sets by Wolff.
