Data description: AGE_DATA.CSV

	This file contains data on individual tree ages at treeline
	sites on the Seward Peninsula.  The data are the raw data used
	to generate the recruitment history (in the file
	REC_HIST.CSV).  The REC_META.CSV metadata file contains all of
	the information on sites needed for this file.  The data were
	collected from permanently marked study plots within 6 study
	sites: two at Bear Creek (Bear Creek Floodplain and Bear Creek
	Non-floodplain) and four along the Fox River (Sandy Bridge, Fox
	Braid, Guy Rowe, Horton Creek).  Trees that were sufficiently
	large to core (approximately 4 cm diameter) were tagged with
	aluminum tags and are identified by the 4-digit tag number.
	Trees that were too small to core were tagged with aluminum
	bird banding tags, and are identified by a 1-3digit tag
	number.  The structure of the data file is described in the
	table below.  Column number Column name Data format Description
1 Site Text Site name 2 Plot Integer Plot number within site.  3 Tag
number Integer Number on permanent tag.  Tag number is a unique
identifier only for trees that were cored.  4-digit tag numbers are
therefore unique, 1-3 digit tag numbers may not be unique.  4 Age of
tree Integer Contains the estimated age of the tree in 2000.  If data
are accessed after 2000, this number should be incremented
accordingly.  5 Establishment date Date (yyyy) Contains the estimated
year in which the tree established.  These dates lack annual precision,
and should be analyzed only in 5-10 year classes.