I feel that, broadly speaking, there are two main meanings of 'semantics' (pardon the pun). Properly speaking, semantics is the field of study dealing with meaning of words, by themselves or in a larger context. However, in popular use 'semantics' often has a negative connotation and refers to focusing on meaningless differences in the form of the message, e.g. if you say "there are twelve eggs", and I say "there is a dozen eggs", we are literally saying different things, but there is no ambiguity over how many eggs there are.You're quibbling with me about the meaning of the word neolithic. That's semantics.
Your choice of words, "quibbling" or contrasting "semantics" with "issue of substance" (as in your reply to @Paul Farquhar ), made me think you were using "semantics" in this second way, while IMO we did not agree on the content of the message, rather than its form. That's why I said I didn't think what we were discussing was just semantics.
Then it should be quite easy for you to provide actual examples of these descriptions of material culture showing the events of the story couldn't have occurred before 4,000 BC.
The book is about a dangerous trek across a continent to destroy a magical gold ring by throwing it into a volcano because, it being magical, it can't be melted in regular forges:
Gandalf-LotR-Chapter-2 said:Your small fire, of course, would not melt even ordinary gold. This Ring has already passed through it unscathed, and even unheated. But there is no smith’s forge in this Shire that could change it all. Not even the anvil and the furnaces of the Dwarves could do that.
Given this, to me it really feels weird you insisting on proofs that the story couldn't have taken places before 4000 BC. But again, just from the first few pages of the prologue:
- Writing: the framing device is that both the Hobbit and LotR are just excerpts and adaptations of Bilbo's and Frodo's diary, The Red Book of Westmarch
- Books in a form they didn't assume until thousand of years after invention of writing (the Red Book is a red-leather bounded volume)
- Hobbits do not like any technology more advanced than forge-bellows or water-wheels
- Horse riding
- Carts
And given that a picture is worth a thousand words, here is Tolkien's drawing of Bag's End: