All those mustelids and bears, except the Polar Bear, are well-known omnivores. I'm particularly pleased to see that the same (unintended) pun with bears and berries (German: Bären & Beeren, pronounced the same) works in English. 8-)
Well, it would surprise me, if only because there hardly were any angiosperms in the middle EK, and probably no berries at all. Means, I think, there were no plant parts that were easier to digest than leaves and could have been attractive to carnivores (with short guts etc.). Fallen ginkgo fruits might be a possibility, though.