AM. took down bits of AC3 9, 10 and 12, left it clean for photos later in the day. Moved to AC4, sectioned AC4 Locus 6, took down the east side of the locus. This locus appears to consist of cultural fill surmounted by some surface contexts overlapping each other(including some fallen stones and burnt/stained soil lenses), but on removal and measurement of these, the locus resolved into a nondifferentiated fill with fewer materials-- until the bottom (levels tomorrow) where it became chunkier, burnier and fuller of cultural materials. Including some obsidian, very small glazed sherds, iron fragments.