Trail of Geology Series


Description: Below are lists of reports in the trail of geology (TG) series published by the Pennsylvania Geological Survey. This series was created in 2016 to gather together Survey publications of a sight-seeing nature for the geologic explorer in all of us. Currently, it consists of nontechnical booklets and papers describing the geology of selected Pennsylvania parks, trails (land and water), and points of interest.

In addition to new releases, all of the reports from the Survey’s former park guide series and a few previously published trail guides were reissued as TG reports with no substantive changes. (For these reports, the year of original publication is indicated within the report.) Also, nearly 100 outstanding geologic feature descriptions that were available through several of DCNR’s web-mapping applications have been revised and are published in this new series.

Numbering Convention: Reports are identified with a series abbreviation of TG followed by a number, for example, TG 16–002.0. The numerals before the dash represent the year the report was first published in the TG series, the three numerals after the dash designate the sequence of the report within the series, and the numeral after the decimal point indicates the version. TG 16–002.0 represents the second report in the TG series and has had no revisions since its release. If a revision were to be made, the “.0” would become “.1” to indicate a new version.

Disclaimer: Each user is responsible for the appropriate application of Pennsylvania Geological Survey reports and data as explained in our official disclaimer

Related Publication: Geology of Point State Park was not published by the Survey but is available through the bureau’s website. This pamphlet was prepared by the University of Pittsburgh for the Pittsburgh Geological Society. It does not have a date of publication indicated but was probably prepared in the mid to late 1970s.

Availability: Most of the titles in the list below are active links that will open PDF files of the reports. For larger reports (over 15 MB), the link will initiate the download of a ZIP file.

Several park guides are still in print and may be ordered from the Bureau of Topographic and Geologic Survey. Available park guides are indicated below their corresponding TG titles and clicking on those links will open the ordering instructions for Survey publications. Follow the instructions for free publications when ordering park guides.

Published printed copies from the discontinued park guide series can also be borrowed from the Survey library or possibly from one of our repository libraries. If you are not near one of these libraries, you can go to a local library and ask the librarian to arrange an interlibrary loan.
 

Park Guides          Outstanding Geologic Features           Trail Guides

 

Trail of Geology Park Guides 

Series No.

Title

TG 16–001.0

Trough Creek State Park—Ice mine and Balanced Rock

TG 16–002.0

Hickory Run State Park—Boulder field

TG 16–003.0

Archbald Pothole State Park—Archbald Pothole

TG 16–004.0

Moraine and McConnells Mill State Parks, Butler and Lawrence Counties—Glacial lakes and drainage changes (includes Addendum—Muddy Creek oil field)

order free Park Guide 4 (addendum not included)

interactive version

TG 16–005.0

Leonard Harrison and Colton Point State Parks—The Grand Canyon of Pennsylvania

TG 16–006.0

French Creek State Park, Berks and Chester Counties—Piedmont rocks and Hopewell Furnace 

order free Park Guide 6

TG 16–007.0

Ohiopyle State Park—Geologic features of interest

TG 16–008.0

Valley Forge National Historical Park, Montgomery and Chester Counties—The geologic history

TG 16–009.0

Geology of Nottingham County Park

TG 16–010.0

Gifford Pinchot State Park—Diabase (molten liquid rock)

TG 16–011.0

Ravensburg State Park, Clinton County—Castle Rocks

 order free Park Guide 11

TG 16–012.0

Worlds End State Park, Sullivan County—Geologic features of interest

TG 16–013.0

Ricketts Glen State Park, Luzerne, Sullivan, and Columbia Counties—The rocks, the Glens, and the falls 

order free Park Guide 13

TG 16–014.0

Nockamixon State Park, Bucks County—Rocks and joints

TG 16–015.0

Caledonia and Pine Grove Furnace State Parks, Cumberland, Adams, and Franklin Counties—Geologic features and iron ore industry 

order free Park Guide 15

TG 16–016.0

Swatara State Park, Lebanon and Schuylkill Counties—Geologic features and fossil sites

TG 16–017.0

Samuel S. Lewis State Park, York County—Mt. Pisgah and the lower Susquehanna Valley 

order free Park Guide 17

TG 16–018.0

Promised Land State Park, Pike County—Ancient rivers and ages of ice

TG 16–019.0

Raymond B. Winter State Park, Union County—Scenery, rocks, and springs in eastern Brush Valley 

order free Park Guide 19

TG 16–020.0

White Clay Creek Preserve, Chester County, Pennsylvania, and New Castle County, Delaware—A scenic valley and the Arc Corner

TG 16–021.0

Presque Isle State Park, Erie County—A dynamic interface of water and land 

order free Park Guide 21

TG 16–022.0

Oil Creek State Park, Venango County—Ice and oil shape the land 

order free Park Guide 22

TG 16–114.0

Rocks and ruins of the "Upper Grand"—An illustrated trail guide to the geology and historical archeology of Lehigh Gorge State Park, northeastern Pennsylvania

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Trail of Geology Outstanding Geologic Features

Series No.

Title

TG 16–023.0

Outstanding geologic feature of Pennsylvania—Allegheny Portage Railroad quarry, Blair County

TG 16–024.0

Outstanding geologic feature of Pennsylvania—Alpha Falls, Lawrence County

TG 16–025.0

Outstanding geologic feature of Pennsylvania—Archbald Pothole, Lackawanna County

TG 16–026.0

Outstanding geologic feature of Pennsylvania—Balanced Rock, Huntingdon County

TG 16–027.0

Outstanding geologic feature of Pennsylvania—Boulder Point, York County

TG 16–028.0

Outstanding geologic feature of Pennsylvania—Barbour Rock, Tioga County

TG 16–029.0

Outstanding geologic feature of Pennsylvania—Bauer (Big) Rock, Lehigh County

TG 16–030.0

Outstanding geologic feature of Pennsylvania—Beartown Rocks, Jefferson County

TG 16–031.0

Outstanding geologic feature of Pennsylvania—Big Pocono Overlook, Monroe County

TG 16–032.0

Outstanding geologic feature of Pennsylvania—Bilgers Rocks, Clearfield County

TG 16–033.0

Outstanding geologic feature of Pennsylvania—Blue Knob, Bedford County

TG 16–034.0

Outstanding geologic feature of Pennsylvania—Boiling Springs, Cumberland County

TG 16–035.0

Outstanding geologic feature of Pennsylvania—Bradys Bend, Clarion County

TG 16–036.0

Outstanding geologic feature of Pennsylvania—Canyon Vista, Sullivan County

TG 16–037.0

Outstanding geologic feature of Pennsylvania—Chickies Rock, Lancaster County

TG 16–038.0

Outstanding geologic feature of Pennsylvania—Chimney Rocks, Blair County

TG 16–039.0

Outstanding geologic feature of Pennsylvania—Chinese Wall, Lebanon and Schuylkill Counties

TG 16–040.0

Outstanding geologic feature of Pennsylvania—Colton Point, Tioga County

TG 16–041.0

Outstanding geologic feature of Pennsylvania—Columnar jointed volcanics, Adams County

TG 16–042.0

Outstanding geologic feature of Pennsylvania—Conemaugh Gorge, Westmoreland, Indiana, and Cambria Counties

TG 16–043.0

Outstanding geologic feature of Pennsylvania—Copperas Rock, Huntingdon County

TG 16–044.0

Outstanding geologic feature of Pennsylvania—Cucumber Falls, Fayette County

TG 16–045.0

Outstanding geologic feature of Pennsylvania—Dead-Ice terminal moraine, Crawford County

TG 16–046.0

Outstanding geologic feature of Pennsylvania—Delaware Water Gap, Monroe County

TG 16–047.0

Outstanding geologic feature of Pennsylvania—Devils Den, Adams County

TG 16–048.0

Outstanding geologic feature of Pennsylvania—Devils Race Course, Dauphin County

TG 16–049.0

Outstanding geologic feature of Pennsylvania—Dingmans and Silverthread Falls, Pike County

TG 16–050.0

Outstanding geologic feature of Pennsylvania—Dinosaur Rock, Lebanon County

TG 16–051.0

Outstanding geologic feature of Pennsylvania—Drumlins, Erie County

TG 16–052.0

Outstanding geologic feature of Pennsylvania—Standing Stone and French Azilum, Bradford County

TG 16–053.0

Outstanding geologic feature of Pennsylvania—Glen Onoko, Carbon County

TG 16–054.0

Outstanding geologic feature of Pennsylvania—Governor Dick, Lebanon County

TG 16–055.0

Outstanding geologic feature of Pennsylvania—Grand View, Luzerne County

TG 16–056.0

Outstanding geologic feature of Pennsylvania—Grand View, Bedford County

TG 16–057.0

Outstanding geologic feature of Pennsylvania—Harrison Lookout, Tioga County

TG 16–058.0

Outstanding geologic feature of Pennsylvania—Hawk Mountain, Berks and Schuylkill Counties

TG 16–059.0

Outstanding geologic feature of Pennsylvania—Hickory Run Boulder Field, Carbon County

TG 16–060.0

Outstanding geologic feature of Pennsylvania—High Knob Overlook, Sullivan County

TG 16–061.0

Outstanding geologic feature of Pennsylvania—Horseshoe Bend, Fayette County

TG 16–062.0

Outstanding geologic feature of Pennsylvania—Hyner View, Clinton County

TG 16–063.0

Outstanding geologic feature of Pennsylvania—Ice mine, Huntingdon County

TG 16–064.0

Outstanding geologic feature of Pennsylvania—Jacks Narrows and Thousand Steps, Huntingdon County

TG 16–065.0

Outstanding geologic feature of Pennsylvania—Jacksville Esker, Butler County

TG 16–066.0

Outstanding geologic feature of Pennsylvania—Kinzua gorge, McKean County

TG 16–067.0

Outstanding geologic feature of Pennsylvania—Kitchen Creek Falls, Luzerne County

TG 16–068.0

Outstanding geologic feature of Pennsylvania—Kitchen Creek gorge, Luzerne County

TG 16–069.0

Outstanding geologic feature of Pennsylvania—Rock Garden, Sullivan County

TG 16–070.0

Outstanding geologic feature of Pennsylvania—Lake Arthur, Butler County

TG 16–071.0

Outstanding geologic feature of Pennsylvania—Lake Lacawac, Wayne County

TG 16–072.0

Outstanding geologic feature of Pennsylvania—Lambs Hill Lookout, Bradford County

TG 16–073.0

Outstanding geologic feature of Pennsylvania—Lebo Vista, Lycoming County

TG 16–074.0

Outstanding geologic feature of Pennsylvania—Lehigh Gorge, Luzerne and Carbon Counties

TG 16–075.0

Outstanding geologic feature of Pennsylvania—Lewistown Narrows, Mifflin and Juniata Counties

TG 16–076.0

Outstanding geologic feature of Pennsylvania—Blue Mountain anticline at Macedonia, Juniata County

TG 16–077.0

Outstanding geologic feature of Pennsylvania—Meadowcroft Rockshelter, Washington County

TG 16–078.0

Outstanding geologic feature of Pennsylvania—Midway Crevasse, Luzerne County

TG 16–079.0

Outstanding geologic feature of Pennsylvania—Monroe Border Fault, Bucks County

TG 16–080.0

Outstanding geologic feature of Pennsylvania—Mt. Davis, Somerset County

TG 16–081.0

Outstanding geologic feature of Pennsylvania—Mount Penn scenic lookout, Berks County

TG 16–082.0

Outstanding geologic feature of Pennsylvania—Mt. Pisgah, York County

TG 16–083.0

Outstanding geologic feature of Pennsylvania—Nippenose Valley, Clinton and Lycoming Counties

TG 16–084.0

Outstanding geologic feature of Pennsylvania—Nockamixon cliffs, Bucks County

TG 16–085.0

Outstanding geologic feature of Pennsylvania—Ohiopyle Falls, Fayette County

TG 16–086.0

Outstanding geologic feature of Pennsylvania—Ohiopyle gorge, Fayette County

TG 16–087.0

Outstanding geologic feature of Pennsylvania—Oil seeps, Venango County

TG 16–088.0

Outstanding geologic feature of Pennsylvania—Panther Rocks, Clearfield County

TG 16–089.0

Outstanding geologic feature of Pennsylvania—Pine Creek Gorge (PA Grand Canyon), Tioga and Lycoming Counties

TG 16–090.0

Outstanding geologic feature of Pennsylvania—Pole Steeple, Cumberland County

TG 16–091.0

Outstanding geologic feature of Pennsylvania—Port Kennedy bone cave, Montgomery County

TG 16–092.0

Outstanding geologic feature of Pennsylvania—Potholes at Conewago Falls, Lancaster County

TG 16–093.0

Outstanding geologic feature of Pennsylvania—Presque Isle, Erie County

TG 16–094.0

Outstanding geologic feature of Pennsylvania—Prospect Rock, Wayne County

TG 16–095.0

Outstanding geologic feature of Pennsylvania—Raymondskill Falls, Pike County

TG 16–096.0

Outstanding geologic feature of Pennsylvania—Ringing Rocks, Montgomery County

TG 16–097.0

Outstanding geologic feature of Pennsylvania—Ringing Rocks, Bucks County

TG 16–098.0

Outstanding geologic feature of Pennsylvania—Salt Spring, Susquehanna County

TG 16–099.0

Outstanding geologic feature of Pennsylvania—Sentinel Rock, Bucks County

TG 16–100.0

Outstanding geologic feature of Pennsylvania—Goat Hill serpentine barrens, Chester County

TG 16–101.0

Outstanding geologic feature of Pennsylvania—Slippery Rock Creek Gorge, Lawrence County

TG 16–102.0

Outstanding geologic feature of Pennsylvania—Spring Mountain thrust fault, Schuylkill County

TG 16–103.0

Outstanding geologic feature of Pennsylvania—Susquehanna water gaps, Dauphin and Perry Counties

TG 16–104.0

Outstanding geologic feature of Pennsylvania—Susquehannock overlooks, Lancaster County

TG 16–105.0

Outstanding geologic feature of Pennsylvania—Tamarack Swamp, Warren County

TG 16–106.0

Outstanding geologic feature of Pennsylvania—The Point, Allegheny County

TG 16–107.0

Outstanding geologic feature of Pennsylvania—The Seven Tubs, Luzerne County

TG 16–108.0

Outstanding geologic feature of Pennsylvania—Tower Road vista, Franklin County

TG 16–109.0

Outstanding geologic feature of Pennsylvania—Great Trough Creek gorge, Huntingdon County

TG 16–110.0

Outstanding geologic feature of Pennsylvania—Whaleback, Northumberland County

TG 16–111.0

Outstanding geologic feature of Pennsylvania—White Rocks, Cumberland County

TG 16–112.0

Outstanding geologic feature of Pennsylvania—Wolf Rocks, Centre County

TG 16–113.0

Outstanding geologic feature of Pennsylvania—Wolf Rocks, Monroe County

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Trail of Geology Trail Guides

Series No.

Title

TG 16–114.0

Rocks and ruins of the "Upper Grand"—An illustrated trail guide to the geology and historical archeology of Lehigh Gorge State Park, northeastern Pennsylvania

TG 16–115.0

Geology guide to the Yellow Breeches Creek from Messiah College to McCormick Road

TG 16–116.0

A guide for the geologic tourist to the Northern Extension of the York County Heritage Rail Trail

TG 16–117.0

A float through the Devonian—A river guide to the geology of Bald Eagle Creek from Milesburg to Dowdy’s Hole

TG 16–118.0

From rails to trails to rocks—Geology of the Garrett-to-Rockwood section of the Allegheny Highlands Trail

TG 17–119.0

A guide for the geologic tourist to the York County Heritage Rail Trail

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