Labor atory

The Oxford Tree-Ring Laboratory was formed in 2010 by Michael Worthington and Jane Seiter to provide cutting-edge dendrochronological services to archaeologists, architectural historians, art historians, cultural resource managers, and private house owners. READ MORE

Contact Information

Call or email us for more information about dating your building.

Oxford Tree-Ring Laboratory
Michael Worthington and
Jane Seiter, PhD
25 E. Montgomery St.
Baltimore, MD 21230



Michael Worthington sampling a timber Drayton Hall SC

This is how we sample your building,  READ MORE

Dendrochronology Results

The Laboratory's staff have been involved in the scientific dating of over seven hundred and fifty historic buildings both in the USA and UK. Detailed listings for them can be found here, READ MORE


Oldest building in  NC, Edenton

After two years of investigation of what was a planned rental property, the oldest dated house in North Carolina has been identified in Edenton.
Preservationists with the N.C. Historic Preservation Office, architectural historians with the Architectural Research Department at Colonial Williamsburg and local historians participated in the research. READ MORE


National Trust for Historic Preservation
PBS (Public Broadcasting Service)
United States Forest Service
Colonial Williamsburg Foundation
Mount Vernon Ladies' Association
Old Salem Museum and Gardens

Maryland Historical Trust
State of North Carolina
Preservation Virginia
New Jersey Historical Commission
Historic Preservation Foundation of North Carolina
Historic New England

University of Maryland
University of Georgia
Stanford University
College of William and Mary
Middlebury College Museum of Art

Maryland-National Capital Park and Planning Commission
Charles County (MD) Department of Planning and Growth Management
Montgomery County (MD) Department of Parks
Prince William County (VA) Historic Preservation Division
Holland Township (NJ) Historic Preservation Commission
City of Raleigh, VA

Queen Anne's County (MD) Historical Society
Historical Society of Charles County, Inc.
Nanticoke Historic Preservation Alliance, Inc.
Museum of the Shenandoah Valley
Conococheague Institute
Newtown History Center / Stone House Foundation
Evergreen Heritage Center
The Presidio Trust of San Francisco