One solution to finding wood is a rolling program of ringbarking trees to enable a steady source of wood throughout the year. There would also have been opportunities to obtain storm-wood from the local rivers and even from beaver dams.
From the archaeology we can see that nuts were popular but a lot of the diet would presumably have been meat.
If time is spent between the summer camp and the winter camp then folk would have know the location of the best food larders. The folk at Star Carr also took fish and wildfowl. So I still don't think that they would have spent hours foraging for fruit & veg especially when meat was so plentiful & relatively easy to obtain.
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