In conjunction with the post on the average pay of a professor of archaeology and the additional statistics on full professors, in the United States, here is a break down of associate professors pay (assumed full time) to give you an idea of range in pay:
This is the distribution by individual associate professor and not by department. The majority of the associate professors actually make less than the 80k average. The range is pretty great from 48k to 114k. It should be stressed that these are averages from universities converted to average archaeology wages so the actual pay may differ slightly (see methodology here). The sampling is not perfect with some archaeologists left out do to a lack of data on their averages about 20. The actually distribution may differ slightly from this.