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Keywords: Tree.ring.arp.jpg The growth rings of an unknown tree species at Bristol Zoo Bristol England This trunk is three feet 1 metre across <br> Notice that a ring is not of uniform width i e it cannot be assumed that a wide ring represents a good growing season since the opposite conclusion could be made elsewhere on the same ring Photographed by Adrian Pingstone in September 2005 and released to the public domain 2005-09-18 own assumed Arpingstone Growth rings |