And well said! It is a possibility. Shell middens all over the Atlantic can be 50 m long or 20 m wide. Their height reaches 5 m.
BUT in any case I don't see why people do not question the dates in Carrowmore for instance, which date from the 70s and 80s. About 200 monuments are scattered all around that area and it is quite possible that some of them were created before the early Irish adopted farming. In fact, most of the Western Atlantic was slow to adopt it, and it took 1,000 years longer than elsewhere in Europe.
The first Mesolithic (?) graves in Sweden date from around 5,000 BCE.
Portuguese archaeologist M. Calado has for a long time supported the view that the early dates found under the menhirs of Almendres and the other circular structures in Portugal make them centres of pastoralism (i.e. semi-settlers). In fact, after travelling through many areas in the Iberian peninsula, France or Wales for instance, I find it REALLY hard to believe that these ultra-rocky places were ever suitable for anything other than pastoralism.
Even these days, they are still not too prone to farming.
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