An introduction to tree ring dating pdf
A tree ring consists of two layers: During wet, cool years, most trees grow more than during hot, dry years and the rings are wider.Drought or a severe winter can cause narrower rings.They'll count all of the rings from the oldest samples as they are aligned with the younger samples to determine the total amount of time represented by the rings.They should count aligned rings that appear on several samples only once.Background Trees contain some of nature's most accurate evidence of the past.Their growth layers, appearing as rings in the cross section of the tree trunk, record evidence of floods, droughts, insect attacks, lightning strikes, and even earthquakes. Grenda, Jeffrey Homburg, Manuel Palacios-Fest, Steven Shelley, Angela Keller and Davis Maxwell Spatial and Temporal Distributions of Archaeological Heated-Rock Cooking Structures in the Transverse Mountain Ranges: Proposed Markers of Land-Use Shifts since the Early Holocene [SCA Proceedings - PDF].
By counting the rings of a tree, we can pretty accurately determine the age and health of the tree and the growing season of each year.
They'll work in groups to reconstruct a 50-year climatic history.
Learning Goals Procedure Overview The graphic below shows how the Sample 1 and Sample 2 strips can be aligned.
This pattern, which can be graphed, is the type of pattern scientists might look for when studying climate change.
Douglass, Richard Ciolek-Torrello, Sarah Van Galder, Benjamin R. The Coleville and Bodie Hills NRCS Soil Inventory, Walker and Bridgeport, California: A Reevaluation of the Bodie Hills Obsidian Source (CA-MNO-4527) and Its Spatial and Chronological Use. Spatial and Temporal Distributions of Archaeological Heated-Rock Cooking Structures in the Transverse Mountain Ranges: Proposed Markers of Land-Use Shifts since the Early Holocene [SCA Proceedings - PDF].
Matching these patterns can show the year a tree was cut, thus revealing the age of a dwelling.