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Phase
3b
An
inner oval of bluestones was added, likely composed of stones removed
from the initial bluestone double circle of Phase 2. In addition,
two concentric circles of pits, known as the Y and Z holes, were
added outside the trilithon circle. It has been suggested that these
were dug as footings for two additional stone circles, but there
is no evidence that they ever held standing stones. It may be that,
like the Aubrey holes, they had another purpose.
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