THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Aet. YII. — Notes on the Physiography and Glacial Geology 

 of the Northern Catskill Mountains ; by John L. Rich, 

 University of Illinois. 



Contents. 



Introduction. 

 Physiography. 



General Statement. 

 Drainage. 



Detailed Physiographic Features. 

 Glacial Geology. 



Direction of Ice Movement as Indicated by Striae. 

 Moraines. 



Along headwaters of West Branch of Delaware Eiver. 



Moraines in Schoharie Valley. 



Moraines along the East Branch of the Delaware. 

 Local Glaciation. 

 The Grand Gorge Lake. 



Grand Gorge Delta. 



Platter Kill deltas. 



Deltas on the Manor Kill. 



Deltas along Batavia Kill. 



Delta at Windham. 



Apparent absence of deltas on the upper Schoharie 

 Creek and its tributaries. 



Lake clays. 



Lower lake levels in Schoharie Valley. 

 Drift-filled Gorges and Hanging Valleys. 

 Summary. 



The following paper is an attempt to assemble, in as nearly 

 complete form as possible, the results of somewhat scattered 

 observations on the physiography and glacial geology of the 

 northern Catskill Mountains and the adjoining plateau. These 

 observations have been made at intervals, mostly in vacation 

 time, during the past eight years. 



Am. Jour. Sci.— Fourth Series, Vol. XXXIX, No. 230.— February, 1915. 

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