Mostly lithic arenite. Conglomerate clasts are mostly iron-formation and vein quartz.
Conglomerates are massive to crudely bedded.
White to tan quartz arenite, generally thin-bedded. Conglomerate beds are massive, immature, and poorly sorted units with clasts of volcanic and intrusive rocks. Clasts vary from well rounded to subangular and consist mostly of mafic and felsic volcanic rocks in roughly equal proportion. In Michigan basal beds are locally mineralized with chalcocite. Conglomerates are generally massive to crudely bedded and contain rounded clasts of mostly felsic volcanic rocks as much as 50 cm in diameter.