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I suggest you read the EH report
'The investigation and analytical survey of Silbury Hill' Dave Fields ISSN 1478-7008
which will clear up much of the mistakes Malone made in the past.
The core samples show that Silbury was built in one go not in 3 stages.
The terracing is Saxon revetment and the so called Spiral is probably the spoil from the hole that Drax dug in 1777 and thrown over the side. This has been slipping for some time hence the apparent spiral.
PeteG
Something is not right. This message is just to keep things from messing up down the road