widmer: oh, yeah, it is. storey: looks longer, too. widmer: yeah, but i can see the bottom. don't see any bats. well, i'm standing in gordon's test pit. storey: human bone. there is human bone here, yes. keach: the cave floor is made of limestone and decomposed bat guano. that's the reason for the masks. the dry soil has preserved the bones for 3,000 years or more. storey: good place to put a pit. let's put a pit right here. depending on the age and sex pattern that we find among the skeletons, it will tell us a lot about the social organization of that culture. if everyone is treated the same way, whether they are old or young, male or female, then it's pretty much a society where everyone was equal or treated fairly equally. if however, some people are treated better than others, then it may be an indication that there were inequalities in that society and that not everybody was equal. some people were entitled to a more elaborate burial treatment, for example. ah, back out to where we can stand up. keach: back in her laboratory, storey separated the bones by type. it was