LISBON FALLS – The Lisbon Historical Society will meet at 7 p.m. Wednesday, May 9, at the MTM Center, 18 School St. (rear entry), Rooms 5 and 6.

Charles W. Plummer, PhD, will speak on the advance of the last glacier into Maine and how it affected the Atlantic Ocean and shaped the landscape around Lisbon, Durham and Pownal.

About 25,000 years ago, the Laurentide Ice Sheet began to advance into Maine from Canada, moving in a southeast direction. It gradually covered all of New England. As it bulldozed the soil, scratched and polished bedrock and scoured valleys and hills, it helped shape the landscape in Maine. The glacier began to recede about 18,000 years ago and as it melted, it deposited boulders and stones along with clay, sand and gravel.

By about 14,000 years ago, the edge of the ice was in what is now Lisbon, Durham and Pownal, all of which were covered by the Atlantic Ocean.

Plummer, who teaches a Maine history course for Auburn Adult Education, will, with the use of hand-drawn diagrams he has made, coupled with photos he has taken and converted into overhead transparencies, take members on a visual tour of that period.

For more information, contact Dorothy J. Smith, secretary and curator, at 353-8510.