. Report of the geological exploration of the fortieth parallel . z, about 1,000 or 1,500 feet belowthe summit, in a piece of quartzitic debris which could not be distinguishedfrom the rock in situ immediately above it, was obtained half of a ribbedhracMopod, referred with some doubt by Hall and Whitfield to Spirifer material of the fossil itself is precisely that of the enclosing quartzite,and there is a strong probability that the fragment represents a horizonabout 700 feet down from the summit of Mount Agassiz, and the fossil,which is a Carboniferous one, offers very fair evidenc
. Report of the geological exploration of the fortieth parallel . z, about 1,000 or 1,500 feet belowthe summit, in a piece of quartzitic debris which could not be distinguishedfrom the rock in situ immediately above it, was obtained half of a ribbedhracMopod, referred with some doubt by Hall and Whitfield to Spirifer material of the fossil itself is precisely that of the enclosing quartzite,and there is a strong probability that the fragment represents a horizonabout 700 feet down from the summit of Mount Agassiz, and the fossil,which is a Carboniferous one, offers very fair evidence of the age ofthe series. It is altogether impossible that a fragment of the limestoneswhich once arched over this region could have withstood the long periodof erosion which has degraded the range since the close of the Cretaceousage. I therefore conclude that this cannot be a relic of the fossiliferousUpper Coal Measures which were once vertically above tliQ spot. It seemsequally improbable that a traveller, Indian or otherwise, should have acci- , VII. <
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