(1) Out of all strata, the most detailed archaeological sequence can be determined from Stratum B because it contains a thorough description of a large variety of evidence. Namely, an assortment of pottery and bottles and a burial site with numerous artifacts are described. This evidence can paint a great picture for archaeologists attempting to determine an archaeological sequence.
(2/3) Yes, there is evidence that some mixing and filling occurred within this archaeological site. Firstly, from the diagram Stratum I and Stratum H dig into each other. I believe this pattern could indicate either mixing or filling. Another piece of evidence that points to filling is the pattern of Strata F and E. As Stratum F moves along to the right, it begins to taper off. Stratum E seems to correct that tapering because it does not sit directly on top of Stratum F. This may indicate that Stratum E was laid down to level out the ground.
Finally, mixing is also indicated in a number of different strata based on the fact that they contain some of the same artifacts. For instance, Strata C and D both contain bottles with undecorated triangular stirrups. While this may simply tell us that the same types of bottles were used over a longer period of time, it could also mean that digging and mixing occurred.
(4) From the diagram, I believe that the wall was built on top of Stratum P. In other words, ground level at the time that the wall was built was Stratum P.
(5) Strata H and H’ appear to be about the same age as they are at about the same level vertically as well as containing some of the same artifacts. Strata I and I’ must also be about the same age because they are on about the same level vertically. The same goes for Strata J and J’, and Strata N and K’.
(6) Strata H, I, I’, J, K, L, M, N, O, and P bracket the construction of the wall.
(7) Archaeologists would have encountered the burial in Strata B and C first and the burial in Strata P and Q second. However, due to the Law of Superposition, burial B/C is actually newer than burial P/Q. This is because the Law of Superposition states that the strata at the bottom of an archaeological site are older than the strata at the top of the site.