The doorway led to an inner chamber, or a passage and chamber, lined with flat slabs. In all but the portal dolmens, the tomb was then covered in earth and small stones to make a mound.
While some of these stone structures did indeed have human remains contained within them, it is erroneous to suggest that they all were "tombs". It is peculiar to note that after being in use for 3-4,000 years many of these contained no bones whatsoever. Some remains that were carbon dated showed that the interments were inserted hundreds of years after the megaliths were constructed. It would seem that when the original purpose of the "passage tombs" was abandoned, they were adapted for use as crypts by later generations.
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