No
We can assume that those who did the artwork in the Lascaux caves and others in S. France were operating with some form of communication
http://www.culture.gouv.fr/culture/arcnat/lascaux/en/
But we can't be sure that other bands used the same means.
We can also assume that those who worked together to make tools in what is now Tanzania were operating with some form of communication
Homo habilis - Wikipedia
But we can't be sure that other bands used the same means.
What we can do is look at the common features in all the existant languages and build a {grammatical\phonetic\etc} tree similar to the way genomic trees are constructed, and find that the result bears a remarkable reflection of the same tree based on {cultural\ethnic\racial} developments, even factoring cross-fertilizing between groups that interact (at both levels).
I read a fascinating article on it but have lost my reference.
we are limited in our ability to understand
by our ability to understand
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