Type section and use of name: The term Pinnick Coal was first used by Franklin (1939, p. 9-10) for the coalbed exposed in a small mine opening west of Thomas Pinnick's house in the SE¼SW¼ sec. 32, T. 2 N., R. 2 W., Orange County, Ind. The coal was given the rank of member in the Mansfield Formation by Gray, Jenkins, and Weidman (1960, p. 26).
Description: The Pinnick Coal Member at the above mine was described by Franklin as shiny, blocky, and 2,1 feet (0.6 m) thick. Generally this coalbed is less than 1 foot (0.3 m) thick and is difficult to trace. The roof of the coal is carbonaceous shale or massive medium-grained ferruginous sandstone. The floor is underclay. The Pinnick coal lies immediately above the so-called Hindostan Whetstone Beds, and in the area where it is thickest, it is some 50 to 185 feet (15 to 56 m) above the base of the Mansfield Formation (Gray, Jenkins, and Weidman, 1960, p. 24; Hutchison, 1964, 1967, and 1971a).
Correlation: The Pinnick has been mapped in northwestern Orange County (Gray, Jenkins, and Weidman, 1960, pl. 1), Dubois County (Hutchison, 1964), and Martin County (Hutchison, 1967). Correlations with other named coalbeds in the Mansfield Formation to the north and the south of this area have not been established.