Timber core samples are sampled and used to measure the width of annual growth rings; by taking samples from different sites within a particular region, researchers can build a comprehensive historical sequence.
22.
Dr . Scott Stine, a paleoclimatologist at California State University at Hayward, used radiocarbon dating techniques to determine the age of the trees'outermost annual growth rings, thereby establishing the ends of drought periods.
23.
Over 250 annual growth rings were once counted in a log square being sawn for gunwales in an English boatyard, while a tree once grown at Kew Gardens, London, attained a height of only in 50 years.
24.
Analysis of the annual growth rings of the trees has shown that in a colossal piece of misfortune, the Roanoke colonists _ and the Jamestown settlers who followed them a few years later _ arrived in the worst droughts of the last 800 years in that part of the country.
25.
Chris Carter was inspired to write this episode based on an interest in dendrochronology, a subject that involves analyzing annual growth rings found in non-tropical tree species, Carter also credits the episode's ominous ending with his experience growing up in the era following the Watergate scandal, having spent his life coming to mistrust the government profoundly.
