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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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