Mount Rainier National Park, Washington. Trees are sampled at the lowest possible level to determine their age.
Dates
Date Taken
1845
Summary
Mount Rainier National Park, Washington. Trees are sampled at the lowest possible level to determine their age. The date is obtained by subtracting the number of annual rings in a complete sample from the number of the year after the outer ring was formed. The next year must be used, for although the last year of growth of a tree is not complete by midsummer, for dating purposes the outer ring and growth year are complete. Carbon Glacier started to recede from here about 1845. Figure 2, U.S. Geological Survey Professional paper 387-B.
Summary
Mount Rainier National Park, Washington. Trees are sampled at the lowest possible level to determine their age. The date is obtained by subtracting the number of annual rings in a complete sample from the number of the year after the outer ring was formed. The next year must be used, for although the last year of growth of a tree is not complete by midsummer, for dating purposes the outer ring and growth year are complete. Carbon Glacier started to recede from here about 1845. Figure 2, U.S. Geological Survey Professional paper 387-B.
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