i. 4 w 
g spurs separated by ravines. The spurs are truncated at 
keir lower ends by a sea cliff. The hill at the left terminates 
ruptly at the valley in a steep scarp, from which it slopes 
adually away and forms an inclined table-land* that is trav- 
_» _ t j « i ^ 
fed by a few shallow gullies. On the map each of these 
itures is represented, directly beneath its position in the 
, etch, by contour lines. 
The contour interval, or the vertical distance in feet between 
| |e contour and the next, is stated at the bottom of each map. 
: tis interval differs according'to the topography of the area 
ipped: in a flat country it may be as small as 1 foot; in a 
mntamous region it may be as great as 250 feet. Certain 
ntour lines, every fourth or fifth one. are made heavier than 
/ Vi 9 
3 others aud are accompanied by figures showing altitude, 
le heights of many points—such as road corners, summits, 
\ rfaces of lakes, and bench marks—are also given on the map 
figures, which show altitudes to the nearest foot only. More 
et altitudes—those of bench marks—as well as the geodetic 
prcli nates of triangulation stations, are published in bulletins 
ued by the Geological Survey. 
tiering and the works of man are shown in black.* Bound- 
State, - countyy-city, land grant, town- 
p, or reservation, are shown by continuous or broken lines 
(different kinds-and weights. Good motor or public road 
s 
3 sl iowui by fine double liues, poor motor or private roads by 
shed double lines, trails by dashed single lines. 
by the name of a city, town 
e 
