David M. Rohr, A. J. Boucot, John Miller, Maxine Abbott; Oldest termite nest from the Upper Cretaceous of west Texas. Geology ; 14 (1): 87–88. doi: https://doi.org/10.1130/0091-7613(1986)14<87:OTNFTU>2.0.CO;2
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Wood borings and insect frass from the Upper Cretaceous of Texas are interpreted to be the oldest known termite nest, the oldest known termite fecal pellets, and one of the few examples of trace-fossil evidence of social behavior in insects. It illustrates a form of behavioral fixity insofar as coprolite form, feeding habits, and substrate are concerned.