Page:The Journal of geology (IA journalofgeology11893univ).pdf/217

north of it, except at those points at which the later drift reaches the border of the earlier. The moraines from which these high-gradient trains of gravel take their origin lie between the two areas of depression-deposits, and there is abundant and clear evidence that they were later than the one and earlier than the other. The phenomena connected with the earlier depression should, therefore, be considered quite independently of the Champlain depression. None of the agencies of the later depression can be legitimately appealed to in explaining the formations of the earlier depression. The confusion of the past, which is pardonable, should be eliminated, and further confusion avoided by the recognition of the distinctness of the two depressions.