By contrast with continental Europe, our knowledge of the early Iron Age in Britain derives almost exclusively from the study of settlements and fortifications rather than cemeteries. In consequence, though the evidence for settlement patterns and economy, particularly in southern England, is substantial, the material assemblages from these sites reveal a limited range of types and a markedly insular character compared to the extensive cemetery inventories of Central Europe. Cross-channel connexions are none the less attested from the late Bronze Age to the end of the Iron Age, the Channel itself serving as a natural route for trade and exchange rather than as a barrier to cultural communication. Population movements are notoriously difficult to substantiate archaeologically, but
linguistic evidence alone requires the introduction of Celtic-speaking people into Britain and Ireland by a date which can hardly be later than the middle of the first millennium B.C. A simple equation between areas of Celtic settlement and the distribution of La Tene artefact types is plainly untenable here, since this would effectively exclude large parts of Scotland and Ireland which none the less have abundant evidence of Iron Age occupation. In Ireland, the contrast between the distribution of La Tene metalwork in the northern half of the country (coincident broadly with the distribution of beehive rotary querns) and its relative absence in the south west, where later prehistoric settlement is attested notably in small, stone forts (cashels, cathairs), has given rise to the use of the term 'non-La Tene' Iron Age for this variant of insular Celtic culture. The origins of
Ireland's Celtic settlement are contentious, since the surviving linguistic evidence is Q-Celtic, predominantly if not exclusively, by contrast to P-Celtic in Gaul and southern Britain. Scottish Gaelic is generally reckoned not to have been transmitted across the North Channel until the invasions of the Scotti around the fourth century A.D. and thereafter, but it is not impossible that a Q-Celtic language was introduced earlier into Atlantic Scotland along a west coast route from Iberia and south-western Ireland. In archaeological terms, such an Atlantic cultural axis would be essentially non-La Tene, so that La Tene metalwork in Ireland would need to be explained as a separate introduction, perhaps involving reciprocal influences with northern England and southern Scotland, but not necessarily requiring population movements on any significant scale.
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