Spread marmalade in bottom of a greased 12 cup Bundt pan; sprinkle with walnuts. Combine brown sugar and cinnamon. Separate biscuits; dip in melted butter and dredge in sugar mixture. Stand biscuits on edge around pan, spacing evenly. Drizzle remaining butter over biscuits, and sprinkle with remaining sugar mixture. Bake at 350 degrees for 33 to 35 minutes or until golden. Cool in pan on a wire rack 5 minutes. invert onto a serving platter, serve immediately.
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