Geologic units in Wayne county, Pennsylvania

Catskill Formation (Devonian) at surface, covers 62 % of this area

Grayish-red sandstone, siltstone, shale, and mudstone; units of gray sandstone occur in upper part; lithologies in upper part arranged in fining-upward cycles. In the Altoona area, the Catskill Formation is mapped as the Duncannon, Sherman Creek, and Irish Valley Members, which are described under "Central and Eastern Pennsylvania" provinces.

Poplar Gap and Packerton Members of Catskill Formation, undivided (Devonian) at surface, covers 20 % of this area

Includes, in descending order, the Poplar Gap (Dcpg) and Packerton (Dcp) Members of the Catskill Formation.

Long Run and Walcksville Members of Catskill Formation, undivided (Devonian) at surface, covers 14 % of this area

Includes, in descending order, the Long Run (Dclr) and Walcksville (Dcw) Members of the Catskill Formation, which are described separately below.

Duncannon Member of Catskill Formation (Devonian) at surface, covers 3 % of this area

Grayish-red sandstone, siltstone, and mudstone in fining-upward cycles; conglomerate occurs at base of some cycles.

Pottsville Formation (Pennsylvanian) at surface, covers 0.8 % of this area

Gray conglomerate, fine- to coarse-grained sandstone, and siltstone and shale containing minable anthracite coals. Includes three members, in descending order: Sharp Mountain--conglomerate and conglomeratic sandstone; Schuylkill--sandstone and conglomeratic sandstone; Tumbling Run--conglomeratic sandstone and sandstone.

Poplar Gap Member of Catskill Formation (Devonian) at surface, covers 0.6 % of this area

Gray and light-olive-gray sandstone, conglomerate, and siltstone containing intermittent red beds; laterally equivalent to Clarks Ferry, Sawmill Run, and Berry Run Members.

Slide Mountain Formation (Upper Devonian) at surface, covers 0.1 % of this area

Sandstone, shale, conglomerate.

Honesdale Formation (Upper Devonian) at surface, covers < 0.1 % of this area

Sandstone, shale.

Upper Walton Formation (Upper Devonian) at surface, covers < 0.1 % of this area

Shale, sandstone, conglomerate.

Llewellyn Formation (Pennsylvanian) at surface, covers < 0.1 % of this area

Gray, fine- to coarse-grained sandstone, siltstone, shale, conglomerate, and numerous anthracite coals in repetitive sequences.