Lyon series (Lyonian epoch). Name proposed for American standard section of early Permian(?) rocks. Type Wolfcamp sectton is incomplete, and its basal contact is not well known. Kansas section of rocks of Sakmarian age is complete and well exposed over wide and accessible area, including parts of Oklahoma and Nebraska. Name Wolfcamp and time term Wolfcampian should not be used in Kansas, Oklahoma, and Nebraska. In Kansas, the series would include rocks from top of Brownville limestone to top of Herington limestone; that is, it would consist of Admire, Council Grove, and Chase groups. Faunally it would include the zone of PSEUDOSCHWAGERINA, of primitive SCHWAGERINA, and of advanced Triticites TRITICITES; the zone of PERITROCHIA and PROPERRINITES. In Oklahoma, series would include, in Pawnee County, the seven mapped units of Chase group, eight of Council Grove group, and the Admire shale; in Lincoln County would include undivided shale and sandstone sequence below Fallis sandstone, Red Eagle limestone, Johnson shale, and Foraker limestone, and Admire formation.
Named from Lyon Co., eastern KS, site of type localities of Admire group and Americus limestone. Council Grove is a few mi west of the county, and Chase Co. is adjacent on the west.

Source: US geologic names lexicon (USGS Bull. 1200, p. 2284).