Paleo Home Research Data Education What's New Features Paleo Perspectives Site Map Mirror Sites National Climatic Data Center, Asheville, North Carolina navigation bar
Paleo Slide Set: Tree Rings: Ancient Chronicles of Environmental Change
Locally absent ring in Scots pine (Pinus sylvestris).
Under other climate conditions, trees may produce only a partial ring or may fail to produce a ring at all. This may occur in a year in which conditions for growth are particularly harsh. These rings are called locally absent or missing rings and are commonly found in trees which are extremely sensitive to climate. A partial ring is visible in the upper portion of this slide. This ring gets pinched between the rings to the left and right of it and is not visible at all in the lower portion of the slide. Very old and/or stressed trees may also produce very small, barely visible rings only a few cells wide which are called micro-rings. Because of the occurrence of false, locally absent, micro, and missing rings, it is especially important to prepare surfaces carefully and use the technique of crossdating to ensure exact calendar year dates for individual rings. More about this later!

Photo Credits:
Jonathan Pilcher
Palaeoecology Centre, Queen's University, Belfast
Click to View Larger Image
Click on above image to enlarge.

Download a zip file
of a full resolution TIF image

Back to Slide Sets.....

Contact Us
Last Modified: 12 October 2001

Paleoclimatology Program Home Page