Recent research on seasonal effects on tree rings in other trees in the same genus, the plantation pine , has revealed that up to five rings per year can be produced and extra rings are often indistinguishable, even under the microscope, from annual rings.
As a tree physiologist I would say that evidence of false rings in surely counts much more strongly against such the notion.
His dendrochronological studies spanned almost thirty years, of which the last five were spent mostly in the White Mountains.
Through the study of annual growth rings of these trees, a fairly precise method of absolute dating has been obtained.
An extraordinarily gnarled tree, also in the White Pine Mountains [R. It is appropriate to note here that several of history's most noteworthy dendrochronologists have spent a large part of their lives studying this, the oldest and perhaps the hardiest of all the world's trees, in its remote mountain habitat.
The species has been widely used in dendroclimatic reconstruction, most famously figuring in the popular debate over anthropogenic global warming, and in several classic studies of timberline ecology.
Radiocarbon dating has been one of the most significant discoveries in 20th century science. This record has been used, among other things, to calibrate the radiocarbon timescale (the rate of radiocarbon production in the atmosphere is not constant over time, thus the need for calibration). Climatic variations and forcing mechanisms of the last 2000 years. Multi-millenial dendroclimatic studies from the western United States. This has permitted building a continuous chronology from the present back to 6828 BC (Hughes and Graumlich 1996). They lie in the rain shadow of the Sierras, with an average annual rainfall of 10-13 inches.Bristlecones grow in other similar areas and were already the focus of much speculation when Schulman arrived on the scene in 1953.