1) If there were cleaning of the Yand Z holes it would not impact on the date of anything dateable in the hole .
2) It seems likely that the Y and Z holes are a unitary feature with an obvious gap at Z 8 because of the fallen sarsen . That the other 29 Z holes are of similar spacing , depth and roughly concentric with the Y holes suggest contemporaneity rather than a pre sarsen eastern arc followed by a post sarsen much later continuation . There is also nothing to suggest stratigraphically ,from finds or dateable material from with the holes that either the Y or Z holes were pre - sarsen .
3) It is quite clear from Hawley’s report that the Z holes had cut into the ramps making them later .
The arcs of both are irregular (look at the kink in the Y circuit ) making it even more likely that they were not laid out pre sarsen monument .
Why should viewing the solar cycle even be considered for two rough rings of pits , that encompass 360 degrees .Maybe if there were four pits marking the solstices a relationship might be assumed but not an entire circle .
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