Previous & Upcoming Event Schedule
2026 Program Schedule
January 6, 2026 - 7:00 p.m.
Zoom Rock Room – “Geology of York County with Jeri Jones.”
Send an invite request to jonesgeo@comcast.net
January 20, 2026 - 7:00 p.m.
Zoom Rock Room – “Digital Rockhounding with Jake Van der Vliert.”
Send an invite request to jonesgeo@comcast.net
February 3, 2026 - 7:00 p.m.
Zoom Rock Room – “Scares on the Landscape: Remnants of the Charcoal Iron Industry in Pine Grove State Park by Andre Weltman.”
Send an invite request to jonesgeo@comcast.net
February 17, 2026 - 7:00 p.m.
“A Collision Course to solve the location of the Mary Ann Furnace, Codorus State Park, Hanover, PA with Jeri Jones and Renae Weidner.”
Send an invite request to jonesgeo@comcast.net
March 3, 2026 - 10:00 a.m.
“Geology of York County” for Country Meadows – Trolley Road,
March 3, 2026 - 7:00 p.m.
“Geology of Your Favorite Location or Home Town with Jeri Jones.”
Need input from participants on locations.
Send an invite request to jonesgeo@comcast.net
March 10, 2026 - 10:00 a.m.
“The Dillsburg Earthquake Swarm” for Country Meadows – Trolley Road
March 12, 2026 - 11:30 a.m.
“Local Geology and Fossils” for the St. John’s Lutheran Church, York, PA
March 17, 2026 - 11:00 – 12:30 p.m.
“Pennsylvania Geology Made Simple – Part 1,
OLLI – York Campus. Program registration open now.
March 17, 2026 - 7:00 p.m.
“Photographing 2 nd Survey Rocks” with Stephanie Evans, PA Geologic
Survey, Zoom Rock Room
Send invite request to jonesgeo@comcast.net
March 24, 2026 - 11:00 – 12:30 p.m.
“Pennsylvania Geology Made Simple Part 2
OLLI – York Campus. Program registration open now.
March 30, 2026 - 11:00 a.m.
“York County Geology” for the York College of Pennsylvania’s Geography class
March 31, 2026 - 10:00 a.m.
“Slate – The Delta Story” for Country Meadows – Trolley Road
April 1, 2026 - 2:00 -4:30 p.m.
“Geology Hike at Chickies Rock County Park, Columbia, PA”
York College of Pennsylvania Geography Class
April 9, 2026 - 6:30 p.m.
“Fossils and Geology of the York Area”
York Elks Lodge
April 14, 2026 - 10:00 a.m.
“Mines and Quarries of York County”
Country Meadows – Trolley Road
April 14, 2026 - 7:00 p.m.
“The Location of Mary Ann Furnace” with Jeri Jones and Renae Weidner
Codorus Valley Historical Society
April 15, 2026 - TBA.
“Rocks and Soils Intro” for the Adams County Master Naturalists Workshop
Strawberry Hill Preserve
April 18, 2026 - TBA.
“South Mountain Geology” field trip for the Adams County Master Naturalists Workshop Strawberry Hill Preserve
April 23, 2026 - 7:00 p.m.
“Your Backyard Geology” for the Buttonwood Nature Center annual geology series
Church of the Apostles, Waynesboro, PA,
April 28, 2026 - 10:00 a.m.
“Dinosaurs of southeastern Pennsylvania”
Country Meadows – Trolley Road
May 7, 2026 - 1:00 – 2:30 p.m.
Highpoint County Park Geology Walk for Penn State York – OLLI
May 14, 2026 - 1:00 – 2:30 p.m.
Chickies Rock County Park Geology Walk for Penn State York OLLI
May 16, 2026 - Details TBA.
“Your Backyard Geology Tour Bus Trip” through South Mountain, The Mesozoic Basin and Great Valley.”
May 18, 2026 - TBA
“Fun with Geology” for Codorus State Park school programming
May 19, 2026 - TBA
“Fun with Geology” for Codorus State Park school programming
May 21, 2026 - 1:00 – 2:30 p.m.
York County Rail Trail Glen Rock Geology Walk for Penn State York – OLLI
June 9, 2026 - 11:00 a.m.
“Tracking a Dinosaur” program
Glatfelter Memorial Library, Spring Grove, PA
June 13, 2026 - 11 a.m. – 6:00 p.m.
Participate in “Experience Codorus Outdoors” event, Main Boat Launch
Codorus State Park, Hanover, PA
June 14, 2026 - 11 a.m. – 5:00 p.m.
Participate in “Experience Codorus Outdoors” event, Main Boat Launch
Codorus State Park, Hanover, PA
June 22, 2026 - 10:30 a.m.
“Tracking A Dinosaur” for the Mason Dixon Library, Stewartstown, PA
June 23, 2026 - 10:00 a.m.
“Dinosaurs of southeastern Pennsylvania” for Country Meadows – Trolley Road
June 24, 2026 - 1:00 p.m.
“Earthquakes” for Strawberry Hill Foundation Summer Camp
June 26, 2026 - 1:00 p.m.
“Tracking A Dinosaur” for Strawberry Hill Foundation Summer Camp
June 27, 2026 - 9:00 a.m. - 3:00 p.m.
Training for Master Naturalists, Maryland at London Town and Garden,
July 2, 2026 - 10:30 a.m.
“Tracking A Dinosaur” for the Martin Memorial Library, York, PA
July 12, 2026 1:30 - 4:30 p.m.
“Tracking A Dinosaur and Fossil Day, Wallace-Cross Mill, Felton, PS
July 15, 2026- 11:00 a.m.
“Dinosaurs and other prehistoric creatures in southeastern Pennsylvania.” For LLI – York College of PA.
July 16, 2026 - 11:00 a.m.
“Tracking a Dinosaur” program, Red Land Library, Etters, PA
July 19, 2026 - 1:00 p.m.
“In Search of Mary Ann Furnace, Codorus State Park”. Rummel Farm Parking Area
July 30, 2026 - 1:00 p.m.
“Tracking A Dinosaur” for the Kreitz Creek Library, Hallam, PA
August 4, 2026 - 11:00 a.m.
“Tracking A Dinosaur” for the Kaltreider Library, Glen Rock, PA
August 9, 2026 - 3:00 p.m.
“Your Backyard Geology” for the Manheim Historical Society, Fasig House, Manheim, PA
July 19, 2026 - 1:00 p.m.
“In Search of Mary Ann Furnace, Codorus State Park”. Rummel Farm Parking Area
July 30, 2026 - 1:00 p.m.
“Tracking A Dinosaur” for the Kreitz Creek Library, Hallam, PA
August 4, 2026 - 11:00 a.m.
“Tracking A Dinosaur” for the Kaltreider Library, Glen Rock, PA
September 14, 2026 - 10:30 a.m.
“Geology of York County”
Green Thumb Garden Club Freysville, PA
September 15, 2026- 11:00 a.m.
“My Favorite Local Geology PowerPoints” for LLI, York College of PA. 1 https://www.ycp.edu/sites/default/files/2026-07/LLI-Course-Catalog_Fall-2026_Digital-ADA.pdf
September 22, 2026 11:00 a.m.
“My Favorite Local Geology PowerPoints” for LLI, York College of PA. 1 https://www.ycp.edu/sites/default/files/2026-07/LLI-Course-Catalog_Fall-2026_Digital-ADA.pdf
September 26, 2026
Geology Boat Ride on Lake Marburg, Codorus State Park,
9:00 a.m., 11:00 a.m. and 1:00 p.m.
September 29, 2026 - 11:00 a.m.
“My Favorite Local Geology PowerPoints” for LLI, York College of PA. https://www.ycp.edu/sites/default/files/2026-07/LLI-Course-Catalog_Fall-2026_Digital-ADA.pdf
October 7, 2026 - 7:00 p.m.
“Lithic Materials of Eastern Pennsylvania” for the Easton, PA Archaeological Societ
Location TBA.
October 26, 2026 0 10:00 a.m.
“York County Geology” lecture for York College of PA Geography Class
October 26, 2026- 2:30 p.m.
“Geology of Chickies Rock” walk with the York College of PA Geography Class
October 29, 2026
“In Search of Mary Ann Furnace, Codorus State Park” co-lecturer with Renae Weidner for the Penn State York Campus OLLI Program,
November 24, 2026 - 7:00 p.m.
“In Search of Mary Ann Furnace, Codorus State Park” co-lecturer with Renae Weidner for the Spring Grove Area Historical Society
Past Events
January 7, 2025 - 7:00 p.m.
Zoom Rock Room – Penn Dixie Fossil Pit, Hamburg, NY with Dr. Phil Stokes.
Send an invite request to jonesgeo@comcast.net.
40 people in attendance.
January 21, 2025 - 7:00 p.m.
“Your Backyard Geology” for the Spring Grove Area Historical Preservation Society
St. Paul’s Lutheran Church
11 people in attendance.
January 28, 2025 - 11:00 a.m.
“My Favorite Three Geologists” for the Penn State York OLLI program
27 people in attendance.
February 4, 2025 - 7:00 p.m.
Zoom Rock Room – The Tewksbury, NJ Earthquakes” with Greg Herman
Send an invite request to jonesgeo@comcast.net.
28 people in attendance.
February 8, 2025 - 12:00 p.m.
“Gold in Southeastern Pennsylvania and northern Maryland”
for the Mason Dixon Gold Prospectors,
Perkins Restaurant, Hanover, PA
29 people in attendance.
February 18, 2025 - 7:00 p.m.
Zoom Rock Room – “Gold in the Middle Atlantic States” with Jeri Jones
Send an invite request to jonesgeo@comcast.net
29 people in attendance.
March 4, 2025 - 11:00 a.m.
“Geology of the Gettysburg Campaign” for the Penn State York OLLI program
31 people in attendance.
March 4, 2025 - 7:00pm
Zoom Rock Room – “How to Identify Rocks and Minerals” with Jeri Jones
Send an invite request to jonesgeo@comcast.net
29 people in attendance.
March 11, 2025
“Your Backyard Geology” for the Homewood Home Men’s Group, Hanover, PA.
March 13, 2025 - 6:00 – 6:30 p.m. via Zoom.
“Geology of York County” for the York County Master Watershed Program.
March 18, 2025 7:00pm – Zoom Rock Room
“What Good are Lichens and Mosses” with Renae
Weidner. Send an invite request to jonesgeo@comcast.net
29 people in attendance.
March 31, 2025 - 10:00 a.m.
“Geology of York County” for the York College of PA Geography class
24 people in attendance
March 31, 2025 - 2:00 – 4:30 p.m.
Field Trip to Chickies Rock, Lancaster County for the York College of PA Geography class
30 people in attendance
April 1, 2025 - 11:00 a.m.
“Geology of the York County Parks” for the Penn State – OLLI program
17 people in attendance
April 1, 2025 – Zoom Rock Room 7:00p.m.
“Show and Tell Night” with Jeri Jones.
Send an invite request to jonesgeo@comcast.net
17 people in attendance
April 6, 2025 - 2:00 – 4:00 p.m.
“Your Backyard Geology” for the York Springs Historical Society Annual Meeting
April 8, 2025 - 11:00 a.m.
“Geology of the York County Parks” for the Penn State – OLLI program
April 10, 2025 - 7:00 p.m.
Geology of the Gettysburg and Hanover battles for the
Warehime-Myers Mansion, Hanover, PA
April 15, 2025 - 7:00 p.m. – Zoom Rock Room
“The Master Watershed Steward Program” with Jodi Sulpizio,
Send an invite request to jonesgeo@comcast.net
22 people in attendance
May 1, 2025 - 7:00 p.m.
“Your Backyard Geology” for Buttonwood Nature Center,
Church of the Apostles, Waynesboro, PA 7:00 p.m.
28 people in attendance
May 3, 2025 - 8:15 a.m. – 6:00 p.m.
Bus Field Trip with Buttonwood Nature Center
to the #9 Coal Mine Tour and Fossil Collecting to New Ringgold, PA,
(Call Buttonwood to register at 717-762-0373).
44 people in attendance
May 5, 2025 - 9:00 a.m. 3:00 p.m.
Geology and Mining History of southwestern York County Bus Trip for the
Spring Grove Area Historical Preservation Society
Call the SGAHPS to register at 717-225-0732.
34 people in attendance
May 6, 2025 - 7:00 p.m. Zoom Rock Room
“Nature Quiz Night”. Send an invite request to jonesgeo@comcast.net .
19 people in attendance
May 13, 2025 - 11:00 a.m.
“The Dillsburg Earthquake Swarm” for the Penn State – OLLI program
8 people in attendance
May 20, 2025 - 7:00 p.m. Zoom Rock Room
“What’s New in South Mountain Geology” with Jeri Jones
Send an invite request to jonesgeo@comcast.net
19 people in attendance
May 22, 2025 – 7:00 p.m
“Radon in Pennsylvania”
for the Lancaster County Fossil and Mineral Club, Mountville, PA.
22 people in attendance.
May 28, 2025 – 7:00pm
“Geology of York County”
program for the Southern York County Recreation
Commission, Shrewsbury Township Building
9 people in attendance.
June 3, 2025 – 7:00pm Zoom Rock Room
“Klondike Gold Rush” with Paul Fagley.
Send an invite request to jonesgeo@comcast.net
28 people in attendance
June 7, 2025 - 11:00 a.m - 6:00 p.m.
Participant at the Codorus State Park ECO Event, Main Boat Launch Area,
June 8, 2025 - 11:00 a.m. – 6:00 p.m.
Participant at the Codorus State Park ECO Event, Main Boat Launch Area
June 10, 2025 – 6:00pm
Geology of Riverlands State Park walk,
Hellam Township, York County. Meet in main parking area.
6 people in attendance
June 17, 2025 -- 7:00pm
Zoom Rock Room – “Geology of York County Parks” with Jeri Jones.
Send an invite request to jonesgeo@comcast.net
16 people in attendance
June 18, 2025
Instructor for the Pennsylvania Teachers Workshop at
Codorus State Park, Hanover, PA.
15 people in attendance
June 24, 2025 – 11:00 a.m.
“The Geology Along the Susquehanna River” for the Penn State – OLLI program
38 people in attendance
June 28, 2025 – 3:00 p.m.
“How Old is the Susquehanna River?”
Columbia Crossroads Visitors Center, RiverFest 2025
25 people in attendance
June 29, 2025 – 11:00 a.m
“Geology of Chickies Rock” walk for RiverFest 2025.
Meet at the Furnace Road Parking Area
11 people in attendance
July 1, 2025 – Zoom Rock Room – 7:00 p.m.
“The Susquehanna River Petroglyphs” with Paul Nevin.
Send an invite request to jonesgeo@comcast.net .
22 people in attendance
July 8, 2025 – 6:00 p.m.
Geology of Sam Lewis State Park walk, Wrightsville, PA.
5 people in attendance
July 13, 2025 - 2:00 – 4:00p.m.
“Fossils and Minerals” at Wallace-Cross Mill, Cross Roads, PA,
168 people in attendance
July 14, 2025 - 9:00 a.m. 3:00 p.m.
Delta – The Slate Story bus trip for the Spring Grove Area Historical Preservation Society, Call the SGAHPS to register at 717-225-0732.
18 people in attendance
July 15, 2025 – 7:00 p.m.
Zoom Rock Room – “Fracking and Earthquakes” with Joseph Lee.
Send an invite request to jonesgeo@comcast.net .
22 people in attendance
July 28 – August 1 - 9:00 a.m. – 3:00 p.m. Details TBA.
Earth and Space Science Week for Youth, St. Xavier Cathloic School, Gettysburg, PA,
August 5th, 2025 6:00 – 7:00 p.m.
“Earthquakes and Volcanoes for Kids”
Sweet Arrow Lake County Park Pavilion, Pine Grove, PA,
September 15, 2025 9:00 a.m. 4:00 p.m
Geology of the Gettysburg Battlefield bus trip for the Spring Grove Area
Historical Preservation Society. Call the SGAHPS to register at 717-225-0732.
October 9, 2025 1:00 – 2:30 p.m.
Geology Hike at Richard Nixon County Park, Jacobus, PA for OLLI – Penn State York
October 16, 2025 - 1:00 – 2:30 p.m.
Geology Hike at Susquehanna Riverlands State Park, Hellam, PA for OLLI
– Penn State York,
October 23, 2025 1:00 – 2:30 p.m.
Geology Hike at the York County Heritage Rail Trail, Glatfelter Station
Parking Lot for OLLI – Penn State York