Dikes (0)
Faults (1)
Quaternary (2)
| Qs - Sands of Presque Isle |
| Qt - Trenton Gravel |
Tertiary (3)
| Tpb - Pensauken and Bridgeton Formations, undifferentiated |
| Tbm - Bryn Mawr Formation |
Cretaceous (4)
| Kp - Patapsco(?) Formation |
Jurassic (5)
| Js - Sedimentary strata at Jacksonwald and Aspers |
Triassic (6)
| Trd - Diabase |
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| Trg - Gettysburg Formation |
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| Trb - Brunswick Formation |
| Trfl - Limestone fanglomerate |
| Trfq - Quartz fanglomerate |
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| Trh - Hammer Creek Formation |
| Trgh - Heidlersburg Member of Gettysburg Formation |
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| Trl - Lockatong Formation |
| Trgc - Gettysburg conglomerate |
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| Trhc - Hammer Creek conglomerate |
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| Trn - New Oxford Formation |
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| Trs - Stockton Formation |
| Trnc - New Oxford conglomerate |
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| Trsc - Stockton conglomerate |
Permian (7)
| Pg - Greene Formation |
| Pw - Washington Formation |
Permian and Pennsylvanian (8)
| PPw - Waynesburg Formation |
Pennsylvanian (9)
| Pm - Monongahela Group |
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| Pc - Conemaugh Group |
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| Pcc - Casselman Formation |
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| Pcg - Glenshaw Formation |
| Pap - Allegheny and Pottsville Formations, undivided |
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| Pa - Allegheny Formation |
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| Pl - Llewellyn Formation |
| Pp - Pottsville Formation |
Mississippian (10)
| Mmc - Mauch Chunk Formation |
| Mbc - Burgoon Sandstone through Cuyahoga Group, undifferentiated |
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| Mb - Burgoon Sandstone |
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| Mp - Pocono Formation |
| Msc - Shenango Formation through Cuyahoga Group, undivided |
| Ms - Shenango Formation |
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| Mc - Cuyahoga Group |
Mississippian and Devonian (11)
| MDpr - Pocono and Rcokwell Formations, undivided |
| MDsr - Shenango Formation through Riceville Formation, undivided |
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| MDso - Shenango Formation through Oswayo Formation, undivided |
| MDr - Rockwell Formation |
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| MDhm - Huntley Mountain Formation |
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| MDsk - Spechty Kopf Formation |
Devonian (12)
| Dbr - Berea Sandstone through Riceville Formation, undivided |
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| Dcr - Corry Sandstone through Riceville Formation, undivided |
| Dbv - Berea Sandstone through Venango Formation, undivided |
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| Dv - Venango Formation |
| Dck - Catskill Formation |
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| Dcb - Buddys Run Member of Catskill Formation |
| Dcd - Duncannon Member of Catskill Formation |
| Dch - Chadakoin Formation |
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| Dg - Girard Shale |
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| Dne - Northeast Shale |
| Dccf - Clarks Ferry Member of Catskill Formation |
| Dcsc - Sherman Creek Member of Catskill Formation |
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| Dcbs - Berry Run and Sawmill Run Members of Catskill Formation, undivided |
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| Dcpp - Poplar Gap and Packerton Members of Catskill Formation, undivided |
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| Dcpg - Poplar Gap Member of Catskill Formation |
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| Dcp - Packerton Member of Catskill Formation |
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| Dclr - Long Run Member of Catskill Formation |
| Df - Foreknobs Formation |
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| Dciv - Irish Valley Member of Catskill Formation |
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| Ds - Scherr Formation |
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| Dclw - Long Run and Walcksville Members of Catskill Formation, undivided |
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| Dlh - Lock Haven Formation |
| Dcbr - Beaverdam Run Member of Catskill Formation |
| Dcwt - Walcksville and Towamensing Members of Catskill Formation, undivided |
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| Dcw - Walcksville Member of Catskill Formation |
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| Dct - Towamensing Member of Catskill Formation |
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| Dbh - Brallier and Harrell Formations, undivided |
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| Dtr - Trimmers Rock Formation |
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| Dh - Hamilton Group |
| Dmh - Mahantango Formation |
| Dm - Marcellus Formation |
| Doo - Onondaga and Old Port Formations, undivided |
| Don - Onondaga Formation |
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| Dbe - Buttermilk Falls Limestone through Esopus Formation, undivided |
| Dor - Ridgeley Member of Old Port Formation |
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| Drc - Ridgeley Formation through Coeymans Formation, undivided |
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| Dosn - Shriver, Mandata, Corriganville, and New Creek Members of Old Port Formation, undivided |
| DSop - Onondaga Formation through Poxono Island Formation, undivided |
| DSkt - Keyser and Tonoloway Formations, undivided |
| DSkm - Keyser Formation through Mifflintown Formation, undivided |
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| DSkc - Keyser Formation through Clinton Group, undivided |
Devonian and Silurian (13)
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| DSkm - Keyser Formation through Mifflintown Formation, undivided |
Silurian (14)
|
| Swm - Wills Creek Formation through Mifflintown Formation, undivided |
| Swc - Wills Creek Formation |
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| Sdp - Decker Formation through Poxono Island Formation, undivided |
| Sbm - Bloomsburg and Mifflintown Formations, undivided |
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| Sb - Bloomsburg Formation |
| Ss - Shawangunk Formation |
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| Sc - Clinton Group |
| St - Tuscarora Formation |
Ordovician (15)
|
| Ojb - Juniata and Bald Eagle Formations, undivided |
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| Oj - Juniata Formation |
| Obe - Bald Eagle Formation |
| Or - Reedsville Formation |
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| Om - Martinsburg Formation |
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| Omgs - Graywacke and shale of Martinsburg Formation |
| Oml - Limestone of Martinsburg Formation |
| Oh - Hamburg sequence rocks |
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| Ohsg - Shale and graywacke of Hamburg sequence |
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| Ohg - Graywacke of Hamburg sequence |
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| Ohl - Limestone of Hamburg sequence |
| Ohjv - Jonestown Volcanic Suite |
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| Oco - Cocalico Formation |
| Ocl - Coburn Formation through Loysburg Formation, undivided |
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| Ocn - Coburn Formation through Nealmont Formation, undivided |
| Oc - Chambersburg Formation |
| Oha - Hershey Formation through Annville Formation, undivided |
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| Ohm - Hershey and Myerstown Formations, undivided |
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| Ojk - Jacksonburg Formation |
| Obv - Valentine Member of Benner Formation |
| Obl - Benner Formation through Loysburg Formation, undivided |
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| Osp - St. Paul Group |
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| Oan - Annville Formation |
| Ob - Beekmantown Group |
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| Oba - Bellefonte and Axemann Formations, undivided |
| Obf - Bellefonte Formation |
| Ops - Pinesburg Station Formation |
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| Oo - Ontelaunee Formation |
| Orr - Rockdale Run Formation |
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| Oa - Axemann Formation |
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| Oe - Epler Formation |
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| Ons - Nittany and Stonehenge/Larke Formations, undivided |
| On - Nittany Formation |
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| Ori - Rickenbach Formation |
| Osl - Stonehenge/Larke Formation |
| Os - Stonehenge Formation |
Ordovician and Cambrian (16)
| OCc - Conestoga Formation |
Cambrian (17)
|
| Cg - Gatesburg Formation |
| Cgm - Mines Member of Gatesburg Formation |
| Csg - Shadygrove Formation |
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| Cr - Richland Formation |
| Cal - Allentown Formation |
| Cgl - Lower members of Gatesburg Formation, undivided |
| Cz - Zullinger Formation |
| Cw - Warrior Formation |
| Cms - Millbach and Schaefferstown Formations, undivided |
| Cm - Millbach Formation |
| Ce - Elbrook Formation |
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| Cph - Pleasant Hill Formation |
| Csb - Snitz Creek and Buffalo Springs Formations, undivided |
| Csc - Snitz Creek Formation |
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| Clv - Leithsville Formation |
| Cbs - Buffalo Springs Formation |
| Cul - Lower (Middle?) Cambrian rocks, undivided |
| Czc - Zooks Corner Formation |
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| Cl - Ledger Formation |
| Ck - Kinzers Formation |
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| Cwb - Waynesboro Formation |
| Ct - Tomstown Formation |
| Cv - Vintage Formation |
| Cah - Antietam and Harpers Formations, undivided |
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| Ca - Antietam Formation |
| Cha - Hardyston Formation |
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| Ch - Harpers Formation |
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| Chm - Montalto Member of Harpers Formation |
| Cch - Chickies Formation |
| Cwl - Weverton and Loudoun Formations, undivided |
Probably lower Paleozoic (18)
| Xpg - Pegmatite |
| Xa - Anorthosite |
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| Xgr - Granitic gneiss and granite |
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| Xmgh - Mafic gneiss |
| Xmgp - Mafic gneiss |
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| Xmg - Metagabbro |
| Xu - Ultramafic rocks |
| Xpb - Peach Bottom Slate and Cardiff Conglomerate, undivided |
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| Xpc - Peters Creek Schist |
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| Xm - Marburg Schist |
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| Xo - Octoraro Formation |
| Xwk - Wakefield Marble |
| Xsc - Sams Creek Metabasalt |
| Xgw - "Glenarm Wissahickon" formation |
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| Xw - Wissahickon Formation |
| Xc - Cockeysville Marble |
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| Xsq - Setters Quartzite |
Precambrian (19)
| mb - Metabasalt |
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| mr - Metarhyolite |
| vs - Greenstone schist |
| md - Metadiabase |
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| a - Anorthosite |
| gqm - Graphitic felsic gneiss |
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| ggd - Felsic and intermediate gneiss |
| gga - Banded mafic gneiss |
| gg - Graphitic felsic gneiss |
| fm - Franklin Marble |
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| fgh - Felsic and intermediate gneiss |
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| fgp - Felsic gneiss |
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| hg - Hornblende gneiss |
| mgh - Mafic gneiss |
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| mgp - Mafic gneiss |
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| gn - Felsic to mafic gneiss |
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