and carbonaceous debris suggest deposition on the foreset slope of the deltaic complex mentioned above. Near-absence of calcareous beds, absence of ammonites, dominance of arenaceous foram- inifers, rarity of planktonic foraminifers, and occurrence of Lingula in the lower part of the Graneros Shale all suggest brackish water that probably resulted from river discharge. The most common macroinvertebrates in this part of the formation are Callistina lamarensis (Shumard) and Exogyra columbella Meek and the strata have been assigned to the Callistina lamarensis Assemblage Zone by Hattin (1965, in press). The upper part of the Graneros comprises dark-gray silty shale that commonly includes a few to several thin beds of calcareous sandstone in the lower part and thin beds of skeletal limestone in the upper part. The shale is weakly calcareous locally. Ripple marks and cross-laminations are common features of the calcareous sandstone beds. Upward in- crease in number of foraminifers and appearance of ammonites in the upper part of the Graneros and the general increase in calcium carbonate content of the rocks suggest that salinity increased progressively as Graneros deposition proceeded. Carbonaceous matter and quartzose sand and silt are generally less abundant than in the lower part of the formation, suggesting decreased deltaic influence during deposition of the upper part of the Graneros. These beds are broadly analogous to bottomset beds of modern deltas. Chief macroinvertebrates in upper Graneros strata are Ostrea beloiti Logan, Plesiacanthoceras amphibulum (Morrow), Ino- ceramus rutherfordi Warren, and Borissiakoceras reesidei Morrow. Dominance of the first of these has prompted me (Hattin, 1965, in press) to assign these beds to the O. beloiti Assemblage Zone. Greenhorn Limestone Lincoln Limestone Member.- Basal beds of the Lincoln Limestone Member consist generally of cross-bedded and cross-laminated skeletal, and locally conglomeratic, limestone that lies with sharp stratigraphic contact and abrupt lithologic contrast upon beds of the Ostrea beloiti Assemblage Zone across much of Kansas but on the older beds of the Callistina lamarensis Assemblage Zone at the southern end of the central Kansas outcrop. Nondeposition and local erosion of the upper part of the Graneros were followed by renewed deposition in a shallow- water zone of considerable turbulence that gave rise to these relatively coarse-grained skeletal rocks. Ostrea beloiti is locally concentrated in great numbers in these beds, and Exogyra columbella, possibly reworked from the lower part of the Graneros, occurs rarely in basal Lincoln beds. Molds of a large ammonite, probably Dunveganoceras pondi Haas, are common locally in the basal Greenhorn, and these beds mark the oldest occurrence in Kansas of Ino- ceramus pictus Sowerby, which locally is host to a small Exogyra that is characterized by a broad attachment surface. Initial turbulence during early Greenhorn deposition gave way to quieter conditions far from the eastern shoreline, and beds of laminated, olive-black chalk accumulated under conditions generally unfavorable to bottom-dwelling forms. Scattered 14