First, the Hance Rapids ( lower ) member consists of purple to reddish-purple mudstone, interbedded sandy siltstone, and rare occurrences of thin-bedded subarkose-to quartz arenite.
12.
For example, a quartz arenite would be composed of mostly ( > 90 % ) quartz grains and have little or no clayey matrix between the grains, a lithic wacke would have abundant lithic grains and abundant muddy matrix, etc.
13.
The Sioux quartzite was primarily formed by braided river deposits, of quartz arenite composition, with 95 % of the rock being composed of rounded, fine to medium ( 0.125 0.5 mm ) sand-size quartz grains.
