Roman London - the London wall
These pages are based on a "Royal Commission On Historical Monuments 1834" - actually it is 1928; which is in the public domain.
(20) . London Wall, All Hallows Churchyard.
The city-wall still forms the North boundary of the churchyard and the external face was uncovered in 1905. The Roman work remained to a height of about 12 feet, i.e. to about the present ground-level.
The facing consists, above the plinth of four courses of squared rag-stone a triple bonding-course, five courses of rag, a second triple bonding-course, six courses of rag, a double bonding-course and three more courses of rag.
Below the plinth the foundation was pierced obliquely by a brick-lined culvert, 15 inches by 9 inches set in red mortar, in a hollow depression at a depth of 2 feet 4 inches below the plinth.
The fall of the drain was from South to North, "the soil of this depression had, in the lower part, the appearance of the filling of a stream, being light sandy silt and contained Roman pottery, oyster shells, a human femur and other animal bones.
On digging further in the lower Portion of the stream-deposit, which continued to a depth of 3 1/2 feet below the plinth, many pieces of this were found and the remains of a human skeleton ".
Elevation of Wall, West of Allhallows church - 1905
And in May 2019, this is what I perceive to be the same piece of wall, attached to Allhallows on the Wall
Allhallows on the Wall - London wall in May 2019
Allhallows on the Wall - in May 2019