REPORT OF COMMISSION VII 
GVII-61 
Scales of 1/30,000-1/10,000 
e. Outline and classify ocean shorelines. 
f. Outline the major tributaries and minor streams. 
g. Prepare profiles of the characteristics of the major valleys and ridges. 
h. Mark departures from the general distribution pattern of water bodies 
or courses, and of sudden changes in direction of flow. 
j. Mark features on water bodies (e.g., waves, ice, logs, boats). 
Scales larger than 1/10,000 
k. Outline minor tributaries and distributaries. 
l. Mark locations of artificial drainage features (e.g., dam, drainage ditch, 
tiles area, river straightening). 
m. Mark locations of differences in photographic tone and texture of water 
in various drainage features. 
n. Determine specific characteristics, particularly with respect to associated 
topics, such as transportation on water bodies or land. 
SURFACE CONFIGURATION FEATURES 
Scales of 1/70,000-1/30,000 
a. Outline the major drainage divides between lakes and major rivers. 
b. Outline the areas of lower elevations (valley bottoms and lowlands 
adjacent to major water bodies). 
c. Outline areas on the basis of length of slopes. 
d. Outline in general the probable unglaciated and glaciated areas. 
Scales of 1/30,000-1/10,000 6 
e. Outline the minor drainage divides. 
f. Outline the parts of the area with respect to the amount of land in slopes 
and flat. 
g. Outline the parts of the area on the basis of steepness of slopes. 
h. Outline areas of rock outcrop. 
j. For unglaciated parts: 
1. Outline areas on basis of general rock type (e.g., igneous, sedimen 
tary, metamorphic). 
2. Outline areas on basis of structural characteristics. 
3. Determine general characteristics of specific landforms and geologic 
structures (e.g., dip, strike). 
k. For glaciated areas: 
1. Outline probable areas of mountain and continental glaciation. 
2. Outline areas of glacial erosion and glacial deposition. 
3. Determine direction of glacial movement. 
4. Determine general thickness of glacial drift. 
5. Determine general characteristics of specific landforms. 
Scales larger than 1/10,000 
Determine detailed characteristics of specific landforms and geologic struc 
tures. 
6 Of particular value in this scale class is Ray, R. G., “Photogeologic Procedures in Geologic 
Interpretation and Mapping, Preliminary Report, U. S. Geological Survey, Washington, 1955, 
although the report was prepared from research with photos having scales both larger and smaller 
than 1/39,000.