Within the Permian Word Formation, Glass Mountains. Texas, five ecological associations based on fusulinid species Intertongue complexly. The lateral ranges of species apparently relate to lateral changes of the dominant rock type in the formation and the vertical ranges reflect the expansion of newly evolved species and the gradual extinction of old species.

Of the ten species described, the following four are new: Parafusulina wildei, P. sullivanensis, P. ironensis, and Parafusulina sp. A. The geographic ranges of P. lineata, P. deliclasensis, and P. aiitimonioensis are extended to include the Word Formation in the Glass Mountains.