Texigryphaea in the Glencarin Formation near Two Buttes, Colorado, with notes on an assemblage of Texigryphaea from the Kiowa Formation of southern Kansas
Barry S. Kues
An assemblage of Texigryphaea from the Glencairn Formation near Two Buttes, Colorado includes about equal numbers of T. tucumcarii and T. aff. T. pitcheri, in contrast to Glencairn assemblages in the Dry Cimarron area, in which T. aff. T. pitcheri is very uncommon. The Two Buttes fauna as a whole is much less diverse than in the Dry Cimarron area, and includes some elements, such as Ostrea larimerensis, that are characteristic of the northern part of the southern Western Interior province. The Lower Cretaceous fauna at Two Buttes, Colorado represents a transition between the diverse, normal-marine late Albian faunas to the south and the depauperate, probably brackish faunas to the north and west. An approximately contemporaneous Texigryphaea assemblage from a coquinoid limestone in the upper Kiowa Formation at Avilla Hill, south-central Kansas, consists mainly of T. pitcheri. Individuals in this assemblage display a high degree of variation in shell form and nearly all have medium to large attachment scars, probably reflecting life in a relatively turbulent, high-density environment, on a substrate consisting mostly of shells and shell fragments. The Texigryphaea morphology in the upper Kiowa is moderately similar to that of the Two Buttes assemblage, whereas the Dry Cimarron texigryphaeas are very different from both.
- Kues, Barry S., 1987, Texigryphaea in the Glencarin Formation near Two Buttes, Colorado, with notes on an assemblage of Texigryphaea from the Kiowa Formation of southern Kansas, in: Northeastern New Mexico, Lucas, S. G.; Hunt, A. P., New Mexico Geological Society, Guidebook, 38th Field Conference, pp. 207-215.