| The Annascaul Formation is at least 500 m thick, and is dominated by mudrocks with subordinate quartz wacke sandstones, tuffaceous fine conglomerates and melange. |
| The three major arenite sandstone families are separately described below, but the varieties of wacke can be conveniently considered together as a single group. |
| The most typical external structures of wacke beds are sole markings, which occur on their undersurfaces. |
| The upper surfaces of wacke beds are less well characterized by sedimentary structures. |
| The hole continues through a sedimentary sequence comprised of fine to medium grained wacke and local fine siltstone and argillite sections. |
| The Long Creek Formation consists of laminated quartzose argillite and sandstone interbedded with altered basaltic rocks and minor quartz-rich lithic wacke. |
