The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . 3 ^ CJ a OS 0 a -e a> ti a> > T3 H SJ ^ —^ ?X 1 . ^ tn c 0 ?-^ •i ^ M jii w 3 o m e M C ?^ M ?c l-t c » 0 s 33 « t* J3 C H ?5 c o ?> — u t^ d tl! c 0 33 (T a c c 3 d S w-1 , S Xi M-i m c % ^ c •*^ a ^ ^ ft ?M s SP ^ Jd tl c m ^ C 3 C3 c (3 3 o o <T) u 1 •^ e-i s oo •—I o 668 THE ICE AGE IN NORTH AMERICA. of considerable importance as well
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . 3 ^ CJ a OS 0 a -e a> ti a> > T3 H SJ ^ —^ ?X 1 . ^ tn c 0 ?-^ •i ^ M jii w 3 o m e M C ?^ M ?c l-t c » 0 s 33 « t* J3 C H ?5 c o ?> — u t^ d tl! c 0 33 (T a c c 3 d S w-1 , S Xi M-i m c % ^ c •*^ a ^ ^ ft ?M s SP ^ Jd tl c m ^ C 3 C3 c (3 3 o o <T) u 1 •^ e-i s oo •—I o 668 THE ICE AGE IN NORTH AMERICA. of considerable importance as well as interest. Many haveseemed to assume that they could come into position onlyby being dropped into the water from a boat. The accompany-ing illustration, however, from a photograph of ProfessorRussell taken in front of the Malaspina Glacier, Alaska,shows what was doubtless the real method. A glacial deltais here seen in process of formation. In the summer time,when the drainage channels were overcharged both withwater and debris they would build up a delta terrace neartheir mouth. During a considerable portion of the year,however, these dep
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Keywords: ., bookauthoruphamwarren18501934, bookcentury1900, bookdecade1910
