Show tree rings to fix date of remote civilization reports of have haie been made from the national geographic expedition into the southwest shiell Is endeavoring to fix the date clate definitely of a remote tion which undoubtedly ext existed sted this Is being done by a study of the tree rings as found in some timbers ot of the ancient structures this work will enable the scientists to date the period when the complex and highly developed civilization of chaco canyon produced the beautiful milage pueblo 13 a communal dwelling of 2500 people centuries before the white while man set foot i american Americ aft soil soll the mementos of a civilization which rivaled those of the ancient old world culture ot of which the Bon itans apparently knew nothing have already been brought to 1 washington ashington from year to year but always there was mas the perplexing question I 1 how ilow old are they by minute study and comparisons of the rings of the timbers uncovered covered and old trees and stumps of the vicinity it Is hoped to arrive at a very acau rate date |