100 
of gneiss, once presumably a part of cliffs no longer existing, are 
found on the south slope of the mountain. 
The limestone belt has but few streams, the drainage being 
principally underground through sinks. The Monocacy creek 
enters the limestone plain from the slate hills at Bath and empties 
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Fic. 1.. Map of Northampton County, Pennsylvania. 
into the Lehigh river at Bethlehem. The Saucon creek drains 
the beautiful Saucon Valley and flowing north empties into the 
Lehigh river at Freemansburg. All the rest of the streams head 
near the Kittatinny mountain and flow south either into the 
Delaware or Lehigh rivers thus flowing from the slate belt into 
the limestone belt. 
It is probable that other conditions have as strong a bearing 
