Tree ring growth dating
In western Canada, dendrochronology has been largely confined to the montane and boreal forests (Case and Mac Donald, 1995; Luckman and Innes, 1991).An investigation of fire and insect infestation frequency in the jack pine forests of Manitoba (Gill, 1930) was the first Canadian study to use ring-width data and cross-dating techniques to develop a tree-ring chronology.
Dendrochronology, the study of the annual growth in trees, is the only method of paleoenvironmental research that produces proxy data of consistently annual resolution. Initially the cells are thin walled to conduct the abundant spring soil moisture.
The failure is deep below the surface, over a curved plane, causing the block to rotate and the trees to tilt backward towards the scarp face.
Titled trees produce reaction wood and grow asymmetrically, so that the trunk curves upward to resume a vertical growth.
Whereas the use of these methods is limited by the relatively short life spans of most tree species, evidence of earlier floods and landslides should exist in dead wood.
Reconstructing geophysical events from dead wood is more involved, however, since the logs are not in situ and cross-dating is required to determine the years of anomalous growth.
Shortly afterwards, Powell (1932) compared variation in wheat yields in Saskatchewan to ring-width variation in white spruce and some hardwood species.