Pg. 111, 235. Mincke Member of Kings Lake Formation of Decorah subgroup [informal] of Galena Group. Consists of (1) interbedded layers 1 to 5 inches thick; (2) very fossiliferous calcarenite; and (3) green to brown shale. Bed of yellow bentonite 0.5 to 2 inches thick persistently present, commonly in a bed of brown shale, from 1 to 1.5 feet below top. Thickness 6 feet at type section. Underlies Tyson Member (new); overlies Glencoe Member of Spechts Ferry Formation. Age is Middle Ordovician (Champlainian).
Type section: exposure in south bluff of Meramec River along St. Louis-San Francisco RR, 0.25 mi northeast of Mincke Siding, near center E/2 SE/4 SE/4 sec. 21, T. 44 N., R. 4 E., Manchester 7.5-min quadrangle, St. Louis Co., eastern MO. Named from Mincke Hollow, a small tributary of Meramec River, mouth of which is 0.25 mi southwest of type section.
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Considered informal and should not be capitalized.]

Source: US geologic names lexicon (USGS Bull. 1350, p. 491).