![]() ![]() australis) on a steep 9,000 foot ridge of Pine Mountain in the San Gabriel Range of southern California. Wolffia using a increment borer to age-date an old sierra juniper ( Juniperus grandis syn. Sierra Juniper (Juniperus occidentalis var. Age-Dating Trees By Counting Annual RingsĪge-Dating Old Trees Using An Increment BorerĪge-Dating Wood Samples Using Cross-Dating Method
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