Geologic units in Jack county, Texas

Thrifty and Graham Formations, undivided (Late Pennsylvanian; Virgil Series) at surface, covers 37 % of this area

Thrifty and Graham Formations, undivided

Markley Formation (Pennsylvanian to Early Permian) at surface, covers 19 % of this area

Markley Formation

Home Creek Limestone and Colony Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 11 % of this area

Home Creek Limestone and Colony Creek Shale, undivided

Ventioner Formation (Pennsylvanian; Missouri Series) at surface, covers 7 % of this area

Ventioner Formation

Ranger Limestone and Placid Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 5 % of this area

Ranger Limestone and Placid Creek Shale, undivided

Twin Mountains Formation (Early Cretaceous) at surface, covers 4 % of this area

Twin Mountains Formation

Alluvium (Holocene) at surface, covers 4 % of this area

Alluvium

Ranger Limestone (Pennsylvanian; Missouri Series) at surface, covers 3 % of this area

Ranger Limestone

Wolf Mountain Shale (Pennsylvanian; Missouri Series) at surface, covers 3 % of this area

Wolf Mountain Shale

Jasper Creek Formation (Late Pennsylvanian; Missouri Series) at surface, covers 2 % of this area

Jasper Creek Formation

Winchell Limestone (Pennsylvanian; Missouri Series) at surface, covers 2 % of this area

Winchell Limestone

Paluxy Sand (Early Cretaceous) at surface, covers 0.9 % of this area

Paluxy Sand

Chico Ridge Limestone (Pennsylvanian; Missouri Series) at surface, covers 0.8 % of this area

Chico Ridge Limestone

Glen Rose Limestone (Early Cretaceous) at surface, covers 0.8 % of this area

Glen Rose Limestone

Palo Pinto Formation (Pennsylvanian; Missouri Series) at surface, covers 0.7 % of this area

Palo Pinto Formation

Antlers Sand (Early Cretaceous) at surface, covers 0.6 % of this area

Antlers Sand