216 NEW TRACKS IN NORTH AMERICA. 
days’ travel. As this part of the route was more open, art 
probably comprised long stretches of comparatively. st 
water, it would not be safe to allow a distance of over thirf! 
miles per day, or 300 miles for this interval. Thus the whol 
distance travelled would be 550 miles, or something over 50 
miles from Green River junction to the head of steamboaly 
navigation at Calville. 
4. The absence of any distinct cataracts, or perpendiculay 
falls, would seem to warrant the conclusion that in time 0 
high water, by proper appliances, in the form of india-rubbet, 
boats and provisions secured in waterproof bags, with good 
resolute oarsmen, the same passage might be safely made, and, 
the actual course of the river mapped out, and its peculiat 
geological features properly examined, : 
5. The construction of bridges by a single span would re 
rendered difficult of execution, on account of the usual flaring 
shape of the summits. Possibly, however, points might be | 
found where the mesas approach sufficiently near each oth ot 
for such a purpose. : 
6. The width of the river, at its narrowest point, w: 
estimated at 100 feet, and the line of high-water mark at 
forty feet above the average stage in August. a 
7. The long-continued uniformity of the geological forma- 
tion (termed ‘white sandstone,” probably eretaceous) i 8 
remarkable; but under the term may have been comprise 
some of the later stratified formations. The contrast on 
reaching the dark igneous rocks was so marked that it could 
not fail to be noticed. 
8. Any prospect for useful navigation up or down ti 
cafion during the season of high water, or the transportation 
of lumber from the upper pine regions, could not be regarded 
