| State | Pennsylvania |
|---|---|
| Name | Allegheny Formation |
| Geologic age | Pennsylvanian |
| Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone
Minor
Unconsolidated > Fine-detrital > Clayincludes valuable clay deposits
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Carbonate > LimestoneVanport Limestone
Sedimentary > Coalcommercially valuable Freeport, Kittanning, and Brookville-Clarion coals present; base is at bottom of Brookville-Clarion coal.
|
| Comments | Digital map differences from 1980 printed map: name changed from group to formation. |
| References | Berg, T.M., Edmunds, W.E., Geyer, A.R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000. |
| NGMDB product | |
| Counties | Allegheny - Armstrong - Beaver - Bedford - Blair - Butler - Cambria - Cameron - Centre - Clarion - Clearfield - Clinton - Elk - Fayette - Forest - Fulton - Huntingdon - Indiana - Jefferson - Lawrence - McKean - Mercer - Somerset - Venango - Westmoreland |