nii I'lELD IMUSEUM OE NATURAL HISTORY 
Halls 76 and 77. 
GEOGRAPHIC GEOLOGY. 
The purpose of this collection is to illustrate in a vivid and 
realistic way the surface configuration of the earth. The chief 
feature of the exhibit is a series of relief maps which reproduce 
on as natural and representative scales as practicable, the topog- 
raphy and structure of selected portions of the earth s surface. 
A part of the series shows only topography and sculpture, while 
another part shows geological structure as well as topography. 
To some extent the topography is shown on one map and the 
geological structure on another, so that both elements are repre- 
sented with the greatest distinctness. The portions of the sur- 
face selected to be represented are usually such as to portray 
some typical form of surface sculpturing or of volcanic accumu- 
lation. Some, however, represent natural or political divisions. 
In addition to the relief maps, there are models showing 
geological structure or illustrating methods of development. 
Some of these are dissected so as to show the more intimate 
structure of the formations. There are also exhibited globes, 
wall maps, and other geographic material. The following is a 
list of the principal features : 
Hall 76. 
Entering this hall from the West Dome and passing around 
to the right, the maps against the wall will be found in the 
following order : 
Relief map of Kentucky showing topographical and geologi- 
cal features and location of principal coal fields. 
Relief map of the United States showing limits and theoreti- 
cal curvature of the ancient ice sheet at the stage of the Glacial 
period following the main epoch, modelled on a section of a 
globe 1614 feet in diameter. Scale, 1 inch equals 40 miles. 
Relief map of Missouri showing topographical and geological 
features and principal mining districts. 
Relief map of New Jersey showing topographical and geo- 
logical features. 
Model of Henry mountains and vicinity, Utah, showing geo- 
logical formations and effects of erosion. 
