OCR Text |
Show r A q ( 'The The ) letters 11B . ALY " after ( that t1iat ) , g 4 3148Y means . bench mark , a permanent ( bench beneh ) mark along a spirit level line , a precise level line run by the survey between Greenriver , Utah , and Flagstaff , Arizona , and is the basis for one of the elevations on this map . If you follow up stream you , will see any number of permanent bench marks established along that river . It would be above the bed of the stream . It is a concrete post with a brass tablet set inside with the elevation stamped on it . ( E . 1866-1867 . ) He explained that between mile three and mile four , where the No . 4300 is noticed , it simply means the topography at that place was up to the ( forty- forty ) three hundred foot contour , and that the ( contours contours- contours ) were merely sketched in up to that elevation . ( ( E R ) . 1867-1868 . ) There were many places on the ( Colo- Colo ) rado River where the walls are much higher than ( thirty-nine thirtynine ) hundred feet , which ( would -would would ) not be shown if the map only was made to show contours up to ( thirty-nine thirtynine ) hundred feet above sea level . Each ( contour confour ) line on the map represents a rise of twenty feet . This contoured interval is indicated on the map . He then explained that the blue line as shown at mile eleven represents a stream ( course- course ) with water in it , and a blue broken line represents an intermittent stream course . ( ( K R ) . 1868 . ) These markings are standard on all maps , and the double line , running down the side of the river at mile twenty , represents a second class road , is a ( stand- stand ) |