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Let $\mathfrak g$ be an affine Lie algebra with index set $I = \{0, 1, 2,\cdots , n\}$. It is conjectured in \cite{KNO} that for each Dynkin node $k \inI \setminus \{0\}$ the affine Lie algebra $\mathfrak g$ has a positivegeometric crystal whose ultra-discretization is isomorphic to the limit of acoherent family of perfect crystals for the Langland dual ${\mathfrak g} ^L$.In this paper we show that at the spin node $k=6$, the family of perfectcrystals given in \cite{KMN2} form a coherent family and show that its limit$B^{6,\infty}$ is isomorphic to the ultra-discretization of the positivegeometric crystal we constructed in \cite{MP} for the affine Lie algebra$D_6^{(1)}$ which proves the conjecture in this case.

Ultra-Discretization of $D_6^{(1)}$- Geometric Crystal at the spin node