Show t wy r beds of clay reveal the passage of time geologists can follow the tracks of the atine bear bv the BUD und tell year in ancient ahat even by millions of years the are hard to fount not tar from stockholm ore some beds of clay regu barly arranged in alternating bands chese turn out to of sand ond clay be the layers deposited by the melt ing glaciers of the ice age each one laid down to the spring and summer when the afsa was hottest and as each winter and there was a freeze up melting each summer the fayera become alico l as accurate an index to the antiquity of the ice ae as the an tree are to the age bual rings of a of the tree of meas moreover the same system geological time has now been and scandinavia extended over all parts of india and south america 1 everywhere abs tbs layers appear to cor od so closely in the variations of their thickness year by year that there seeba no doubt were laid down in corresponding years baron garard de geer |