Pg. 38. Blue Springs shale. Top member of Matfield formation of Chase group. Thickness in Nebraska 28 or 29 feet; 25 feet in section east of Burden, Kansas, where it consists of upper and lower shales and a limestone below middle. These units extend north to beyond Florence and south to Oklahoma. The limestone is herein named Bruno limestone, from exposures on Bruno Creek, a few miles northeast of Florence, Kansas. Overlies Kinney limestone and underlies Florence flint. Age is Permian (Big Blue).
Type locality: in foot of Blue River bluffs southeast of Blue Springs, Gage Co., southeastern NE.

Source: US geologic names lexicon (USGS Bull. 896, p. 222); GNC KS-NE Permian Corr. Chart, Oct. 1936.

Pg. 66. Blue Rapids shale as used on p. 66 of Kansas Geol. Society 10th Ann. Field Conf. Gdbk., Sept. 4 to 7, 1936, is a misprint for Blue Springs shale. Age is Permian.

Source: US geologic names lexicon (USGS Bull. 896, p. 222); GNC KS-NE Permian Corr. Chart, Oct. 1936.

Pg. 45. Blue Springs shale member, middle member of Matfield shale. Shale, chiefly red and gray, and relatively minor amount of limestone, except in southern Kansas where several limestone beds occur in upper part of member; farther north, member is less calcareous and limestone is absent; fossils occur in thin limestones and in gray shale beds in southern part of outcrop area. Thickness about 30 feet. Overlies Kinney limestone member; underlies Florence limestone member of Barneston limestone. Age is Early Permian (Wolfcamp).

Source: US geologic names lexicon (USGS Bull. 1200, p. 401).

(Paleozoic Era; Permian System by H.G. O'Connor, D.E. Zeller, C.K. Bayne, J.M Jewett, and Ada Swineford, p. 48.) Blue Springs Shale Member of Matfield Shale of Chase Group. In Kansas, consists chiefly of red and gray shale, and a relatively minor amount of limestone. In southeastern Kansas the gray calcareous shales and several of the thin limestone beds, which occur in the upper part of the member, are fossiliferous. In northeastern Kansas, the member is less calcareous and limestone is absent. Thickness about 15 to 35 feet. Occurs above Kinney limestone Member of Matfield Shale and below Florence Limestone Member of Barneston Limestone, both of Chase Group. Age is Early Permian; Gearyan Provincial Stage (of H.G. O'Connor, 1963, AAPG Bull., v. 47, p. 1873-1877).

Source: Publication.