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Harrisburg Area Geological Society

HAGS

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.

 

Officers:

President- Kent Littlefield- KENT.V.LITTLEFIELD@leidos.com

Vice-president- Bill Bruck- wbruck49@gmail.com

Treasurer- Jeb Baxter- jebaxter@hacc.edu

Secretary- Amy Randolph- secretaryhags@gmail.com

 

Up coming events :11-10-16-hags-aec-mtg-flyer-merritts-legacy-seds

 Pennsylvania’s Freeze-dried Landscapes & How they matter to Dam Removal, Stream Restoration, and the Chesapeake Bay

Presented by: Dr. Dorothy Merrites, F&M College

Abstract:

Widespread valley damming in the eastern U.S. buried, and sequestered late Pleistocene to Holocene (~13,000 yrs BP to 1700 AD) wetlands within two generations of European settlement. Millponds constructed along stream valleys silted in to form broad fill terraces. Historic dams have breached as mills became obsolete; others are slated for dam removal. Post-breach streams incise through stacks of anthropogenic millpond sediment, exposing the buried stratigraphic boundary between pre- and post-settlement valley bottom sediments that clearly distinguishes Anthropocene from pre-settlement sediment. Deep incision also exposes a buried ice-age landscape that can be connected to hillslope landforms and deposits via analysis of airborne Lidar topographic data, revealing widespread solifluction lobes similar to those associated with permafrost thaw in the Dry Valleys of Antarctica and the Coast Ranges of Alaska. Evidence of continuous permafrost during the late Pleistocene (~18,000 to 50,000 yrs BP), including from thermal contraction polygons in bedrock, is also widespread. Radiocarbon dating, pollen and seed analyses are used to document how wetlands and carbon sequestration became established on this periglacial rubble landscape after permafrost thaw circa 18,000 years BP.

Speaker Bio:

Dorothy Merritts (B.Sc. Indiana University of Pennsylvania, M.Sc. Stanford University, Ph.D. University of Arizona) is a geologist with expertise on streams, rivers, and other landforms, and on the impact of geologic processes, climate change, and human activities on the form and history of Earth’s surface. Her primary research in the eastern United States is in the Appalachian mid-Atlantic region, where she investigates the role of human activities in transforming the upland woodlands and valley bottom wetland meadows of Eastern North America to a predominantly agricultural and mixed-industrial/urban landscape since European settlement. She is a professor in the Department of Earth and Environment at Franklin & Marshall College in Lancaster, Pennsylvania.

 

  

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.