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Introduction
The strata sequence currently used is A12A, it is a sequence based on the A12 data and is unique to A12, specifically the abi / underground structure.
The phases are in turn based on the Mozan sitewide frame, Strata sequence MZA dated May 2011.
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The strata definition chart (A12A)
Note that the feature number in parentheses is an exemplar of the stratum, not a definitive model. Entries in bold face refer to the more significant strata.
| phase | sequence | A12 sr |
definition stratigraphy (typology/chronology; sample feature) |
| 9m | 1 | 19 | Topsoil (f234) |
| 9c | 2 | 40 | Gully wash (f360) |
| 8 | 3 | 80 | Scattered occupation (f105) |
| 7m | 4 | 140 | Brickfall / Ancient Gully wash (f318) |
| 7c | 5 | 180 | Non-stair / Non-doorway use (f334) |
| 4t | 6 | 400 | Upper stairway use (f326)) |
| 4j | 7 | 590 | Middle Stairway use (f330) |
| 3j | 8 | 650 | Lower stairway use (f350) |
| 3b | 9 | 700 | Square construction (f388) |
| 2r | 10 | 750 | Circle construction (f375) |
| 2m | 11 | 850 | Earliest substructure (f340) |
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