Named as uppermost member (of 3) of Lenapah limestone of Marmaton group in southeastern KS; named from Idenbro, a station on the Missouri, Kansas, and Texas railroad about 4 mi southwest of Parsons, Labette Co, KS. Type exposure 3 ft thick designated along drainage in SW sec 2, T32S, R18E, east and west of Idenbro, Labette Co in the Cherokee basin. Other measured sections. Identified northward into Linn Co. Consists of limestone, light in color, crystalline, and marked by irregular, wavy beds. Is somewhat fossiliferous, corals being prominent. Much algal material exists, especially in upper part. Weathered surfaces are nearly white. Thickness averages 6 ft, but is greater near KS-OK line in Montgomery Co. Overlies Perry Farm shale member (new) of Lenapah limestone of Marmaton group; underlies Memorial shale of Marmaton. Cross section. Of Pennsylvanian, Des Moines age.

Source: GNU records (USGS DDS-6; Denver GNULEX).