Day 2 of our summer dig saw more progress in Trench 1 in our hunt for trenches cut in the area in the 1960s. We've identified two distinct deposits in Trench 1 - one is made up mainly of rubble and mortar fragments and is concentrated at the west end of the trench, and the other is a more brown and brickearth rich deposit at the east end of the trench.
Although at first both deposits had appeared to contain a lot of modern material, the twentieth century finds have dried up in the rubble at the west end of the trench, apparently only being in the deposit's upper horizon, but the brown deposit at the east end continued all day to produce all manner of late 19th and early 20th century rubbish, including odds and ends of scrap iron and even a Victorian halfpenny.
Determining the boundary between layers can be very difficult in this arid weather, as everything rapidly dries to a grey powder, so it wasn't clear whether there was an edge between the two layers, perhaps suggesting an ex-trench edge, or as we had begun to suspect, if the brown deposit was overlaying the rubble.
To clarify we therefore cut a small sondage (i.e. a trench within a trench), which confirmed that the rubble layer does indeed lie beneath the brown and may therefore extend to the whole length of the trench.
This shows that the rubble is of an earlier date and the brown layer has been dumped on top, although exactly when we cannot prove yet. It is very likely that the Victorian and later rubbish was imported to the site in the 20th century, either at the end of the 1960s digs or during the subsequent works on the nearby gas main, perhaps to level up uneven ground for heavy machinery to drive on.
The problem this leaves us with is telling whether or not the rubble layer is of similar age, or if it is in fact undisturbed rubble from the demolition of the palace in the 17th century.
We'll probably need to get down a bit deeper to find out, but if it isn't the backfill of an old archaeological trench, we may have to look elsewhere.
Meanwhile we opened Trench 2 on our southern secondary target see diagram which eventually will reveal more of a possible floor surface made of brick fragments in the nearby gatehouse. We've only got as far as topsoil removal here so far.