Old Tree Branches (Cliftonville CT9)

4 bags of VERY OLD tree branches and quite a few unbagged ones that have been unearthed on a 'dump' of garden stuff while tidying up a very overgrown garden.
I don't know what kind of trees they've come from but wondered if maybe they'd be ok on an outdoor fire pit, but as I've got no idea about the trees they've come from, the condition they're in or what can be burned in a fire pit please have a good think first if they are suitable for your personal use, and please don't say you'll have them and not come to collect them, as the bags are quite heavy and I can only move them once.
They are for collection only, and I will need the 4 bags and separate unbagged branches to be taken together!
Thank you.