The two unnamed shale members of the Wellington separate the Hollenberg from the underlying Herington Limestone Member of the Nolans Limestone (Chase Group) and the Carlton from the Hollenberg. The Milan Limestone Member is typically a succession of discontinuous, thin carbonate beds (Berendsen and Lambert, 1981 Watney et al., 2003).įigure 53-Exposure of the Wellington Formation (Carlton Limestone Member) in a field on the south side of the road near center of north line NW sec. Fossil insects have been reported from the Carlton at some localities (Zeller, 1968, p. 50), the Hollenberg is 0.3-1.5 m (1-5 ft) thick, the Milan is up to 2.4 m (8 ft) thick, and the Carlton is lenticular (fig. Three of the six members in the Wellington Formation are thin, argillaceous, dolomitic limestones: the Hollenberg and Carlton in the lower part and the Milan at the top of the formation.Īs reported by Zeller (1968, p. Wellington Formation-Marine, brackish, and freshwater fossils have been reported from the nearly 700-ft (214-m)-thick Wellington Formation with the marine deposits in the lower part (Zeller, 1968, p. The Stone Corral Formation is a very useful stratigraphic marker and has been used as the datum in numerous studies of the Permian in the Kansas subsurface. In the subsurface the Wellington Formation, Ninnescah Shale, Stone Corral Formation, Blaine Formation, and Dog Creek Formation can be recognized, but the intervals between the Stone Corral and Blaine and the Blaine and Dog Creek are undifferentiated (Mudge, 1967, p. The Nippewalla Group consists of six formations with the Harper Sandstone and Blaine Formation subdivided into two and four members, respectively. The former consists of three formations, in ascending order, the Wellington Formation with six members (two unnamed), the overlying Ninnescah Shale with two members (one unnamed), and the Stone Corral Formation. This stratigraphic succession is shown in fig. The Kansas Geological Survey (Zeller, 1968 Sawin et al., 2008) divides the Leonardian rocks into the Sumner Group below and the Nippewalla Group above. Major Subdivisions, continued Leonardian Lithostratigraphic Units

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