Via the archaeology section on about.com:
Archaeology is not simply the finite body of artefactual evidence uncovered in excavations. Rather, archaeology is what archaeologists say about that evidence. It is the ongoing process of discussing the past which is, in itself, an ongoing process. Only recently have we begun to realise the complexity of that discourse. … [T]he discipline of archaeology is a site of disputation–a dynamic, fluid, multidimensional engagement of voices bearing upon both past and present.