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CONSTRUCTION SOURCES OF GRAVEL, MINTZER 153 
some glaciated areas of the world this photo tone feature is a significant indicator of 
gravelled plains. 
Results of the study. 
A field study of the glaciated was made near Mindelheim. The airphoto study had 
indicated where to begin the search. Gravel deposits were already being worked for sand 
and road metal aggregate for pavement construction purposes. By field inspection and 
  
Fig.7. A typical view of the cut bank of a gravel quarry. The photo was 
taken near the same location seen in Fig. 6. Notice the steep slope typical 
of gravel. This steep slope is an aid to interpreting potential gravel sources 
in airphoto pattern investigations. 
sampling it was seen that the gravel deposits would be of suitable quality and quantity 
for the road construction. 
Punjab, India. 
Another type of landform yielding gravel sources is the terrace formed from sedi- 
ments deposited in the terrace landform. The writer found that terrace gravels are 
easily found in India. The writer’s investigation lead him to a water transported gravel 
deposit in an elevated position above the Indo-Gangetic Plain. This alluvial tract was 
formed by the Ganges River system. The Ganges valley, one of the three main physio- 
graphic divisions of India, separates the Peninsular region from the Extra-Peninsular 
portion of India. The water-deposited materials found therein give to India one of the 
world’s richest agricultural areas. It is indeed one of great interest and importance in 
the human history of the world. The alluvial plain is described as a basin formed during 
the Upper Eocene age of an uplift of the Himalaya mountains. In the Recent geological 
period sediments filled up the valley to a level plain with a very gentle seaward slope. 
The deposits are stratified sands, silts or clays, with occasional gravel beds and lenses 
of peaty organic matter. In places older sediments of rather dark color are rich in con-