Writing Sample/ Publications/ Research need to be in field?

[warpspeed]

So, I have at least one pending publication (potentially being published multiple times for the same body of research, within my university and in a historical journal) that will be official by the time grad applications begin. However, it is not within my future field of research. Should I be looking to do a piece as my writing sample within that field (Andean) or is what i have (historical archaeology) okay to apply with being that it iwas completely original work? I did my field school within my future field of research and worked with some reputable people, so I do have experience. I'm also doing independent studies on published Andean articles/literature, which will be on my transcript as well. I'm trying to work with some local museums that have artifacts but its hard to get big museums to write back about access.