Harrisburg Area Geological Society


The purpose of the Harrisburg Area Geological Society (HAGS) is to stimulate geologic thought, advance and disseminate geologic knowledge, and provide fellowship amongst area individuals interested in earth sciences. Monthly meetings (at GTS Technologies at 441 Friendship Road in Harrisburg) present a realm of geologic topics, ranging from tectonics, coal, carbonate groundwater geochemistry, Martian geomorphology, engineering geophysics, nuclear waste repositories, and ore mineralogy. Field trips allowed members to visit geologic sites within and beyond Pennsylvania. All events are open to the public and free unless otherwise stated.



President- Kent Littlefield-

Vice-president- Bill Bruck-

Treasurer- Jeb Baxter-

Secretary- Amy Randolph-

May 7, 2016 “Ice and Water on the Sullivan Trail” Monroe and Carbon Counties Field Trip!! You  must RSVP to Kent Littlefield.  HAGS May 7, 2016 Poconos field trip itinerary

Up coming events :HAGS May 7, 2016 Poconos field trip itinerary 5-12-16 HAGS AEC mtg Daeschler fossil fish

May 12, 2016 Meeting at 6:30 p.m. – “New Discoveries from the Age of Fishes: Explorations in the Late Devonian of North America”


Presented by: Ted Daeschler, PhD – Academy of Natural Sciences of Drexel University


Abstract: This presentation describes two decades of paleontological exploration and research on Devonian-age fossils from Pennsylvania and the high Canadian Arctic. Ted Daeschler and his colleagues have discovered a wide diversity of fossil material from the Catskill Formation in north-central Pennsylvania including the earliest known limbed vertebrates in North America. Those discoveries are placed in the context of the evolution of early terrestrial ecosystems to better understand the ecological settings of this evolutionary change. Daeschler and his colleagues have also organized and carried-out an ambitious paleontological project to search for Devonian-age fossils high above the Arctic Circle in the Nunavut Territory of Arctic Canada. Among the discoveries there is Tiktaalik roseae, an animal that lived 375 million years ago and is widely recognized as the best evolutionary intermediate between finned and limbed vertebrates. This presentation will incorporate the methods of fossil discovery and the science behind this research program in vertebrate paleontology.



Speaker Bio: Ted Daeschler has been a vertebrate paleontologist at the Academy of Natural Sciences in Philadelphia since 1987. He currently also serves as Vice-President for Collections at the Academy, and as an Associate Professor in the Department of Biodiversity, Earth and Environmental Science at Drexel University. Ted studied geology at Franklin and Marshall College in Lancaster, Pennsylvania, and received a Masters in paleontology at the University of California at Berkeley. He was awarded his Ph.D. at the University of Pennsylvania in 1998.


Fall 2016 HAGS/AEG meeting dates:

September 8, 2016 – Dr. Sid Halsor, Wilkes University – The Ups and Downs of an Undergraduate Ground Deformation Survey in the Yellowstone Caldera, WY

October 13, 2016 – Bob Beard, P.G., Leidos – The Mid-Atlantic Rockhound

November 10, 2016 – Dr. Dorothy Merritts, F&M College – Legacy Sediments


Spring 2017 HAG/AEG meting dates:

January 12, 2017 – speaker needed

February 9, 2017 – Al Guiseppe, P.G., SSM Inc. – Tackling Complexity through Stochastic Modeling: Yet Another Hydrogeologic Study of the Gettysburg Basin

March 9, 2017 – Seth Pelepko, P.G., DEP – Investigating Paleoenvironmental and Diagenetic Controls on the Skid Resistance of Carbonate Construction Aggregates Mined from the Lower Cambrian Kinzers Formation in the West York 7.5-minute Quadrangle, PA

April 13 – speaker needed

May 11 – speaker needed

HAGS Guidebooks, available for purchase

1st Annual Field TripGeology in the South Mountain area, Pennsylvania, Noel Potter, Jr., editor, April 24, 1982, Reprinted 1992. 37 p. $5.00 plus $2.00 S&H.

2nd Annual Field Trip‐ Geology along the Susquehanna River, south‐central Pennsylvania, J. Ronald Mowery, editor, April 16, 1983, 55 p. $5.00 plus $2.00 S8H.

3rd Annual Field Trip‐ Stratigraphy, structural style, and economic geology of the York‐Hanover Valley, G. Robert Ganis and David Hopkins, April 28,1984, 51 p. $5.00 plus $2.00 S&H.

4th Annual Field Trip‐ Pennsylvania’s polygenetic landscape, William D. Sevon, April 27, 1985, Reprinted 1992, 55 p. $5.00 plus $2.00 S&H.

5th Annual Field Trip‐ Selected geology of Dauphin and Northumberland Counties, Pennsylvania, by W. D. Sevon, W. E. Edmunds, G. R. Ganis, and J. P. Wilshusen, May 17, 1986, 22 p. $5.00 plus $2.00 S&H.

6th Annual Field Trip‐ Lower Jurassic diabase and the Battle of Gettysburg, D. T. Hoff, J. R. Mowery, and G. R. Ganis, April 25, 1987,17 p. plus appendices. $5.00 plus $2.00 S&H.

7th Annual Field Trip‐ The geology of the Lower Susquehanna River area, a new look at some old answers, Glenn H. Thompson, Jr., editor, May 7,1988, 56 p. $5.00 plus $2.00 S&H.

8th Annual Field Trip‐ Karst development and environmental geology in the carbonate rocks of the Lehigh and Lebanon Valleys, William E. Kochanov, April 29, 1989, 33 p. $5.00 plus $2.00 S&H.

In cooperation with the 20th annual Binghamton Geomorphology Symposium at Dickinson College‐The rivers and valleys of Pennsylvania, then and now, by William D. Sevon, October 20, 1989, 59 p. $5.00 plus $2.00 S&H.

10th Annual Field Trip‐ The Ridge and Valley Physiographic Province and the East Broad Top Railroad, William D. Sevon, June 1, 1991, 24 p. $5.00 plus $2.00 S&H.

11th Annual Field Trip‐ Paleozoic geology of the Paw Paw‐Hancock area of Maryland and West Virginia, Marcus M. Key and Noel Potter, Jr., May 9,1992, 25 p. $5.00 plus $2.00 S&H.

12th Annual Field Trip‐ South Mountain and the Triassic in Adams County, Pennsylvania, Raymond Britcher, editor, May 22, 1993, 41 p. $5.00 plus $2.00 S&H.

13th Annual Field Trip‐ Geology of the Lebanon Valley and western end of the Reading Prong, Charles Scharnberger, editor, April 23. 1994, 68 p. $7.00 plus $2.00 S&H.

15th Annual Field Trip‐ Pseudo‐Morainic Topography of the Allentown Area of Eastern Pennsylvania, Duane D. Braun and William E. Kochanov, May 4, 1996, 28 p. $7.00 plus $2.00 S&H.

16th Annual Field Trip‐ Notes on the Hamburg Klippe: biostratigraphy, ash layers, olistostromes, and “exotics,” G. Robert Ganis, April 26, 1997, 52 p. $15.00 plus $2.00 S&H

17th Annual Field Trip‐ Geomorphology in the Northern Cumberland Valley, PA, including the Carlisle Deluge of 1779, Noel Potter, Jr., Donald Hartman, and Helen Delano, April 18, 1998, 49 p, $7.00 plus $2.00 S&H.

18th Annual Field Trip‐ The Cove Syncline by canoe, William M. Roman and Michael A. Knight, May 15, 1999, 16 p. plus maps, Out of Print

19th Annual Field Trip‐ Geology of the Kishacoquillas Valley and vicinity, Mifflin County, Pennsylvania, Michael A. Knight and William M. Roman, May 20, 2000, 18 p. plus maps and sections, $7.00 plus $2.00 S&H.

20th Field Trip‐ Geology and Geomorphology of the South Mountain Area, Cumberland and Franklin Counties, Pennsylvania, Noel Potter, Jr., and William D. Sevon, May 14, 2011, 64 p., $10.00 plus $2.00 S&H.

No formal guidebooks were prepared for the 9th (1990) and 14th (1995) Field Trips. The 2001 trip was a repeat of the 2000 trip.