REPORT OP THE DIRECTOR AND STATE GEOLOGIST 1901 rl3 



and later on the north, with here and there clays of marine or 

 lacustrine origin sheeting over the glacial deposits. 



The work in the Champlain valley was wholly conducted on 

 the New York State side and directed to the fixing of the upper 

 limit of wave action and of the clays. An important deposit 

 with an upper wave limit of 520 feet was discovered near 

 Street Road, which by comparison with the highest definite 

 beach between Port Kent and Keeseville served to give a base 

 of reference for the deformation of the highest wave line. While 

 the strength of wave action at this high level (590 feet near Port 

 Kent) is consonant with the theory of submergence to this depth 

 at that point, the evidence which would serve to discriminate 

 between marine and lacustrine wave action was not locally de- 

 termined. The tilting of this upper level in the Champlain dis- 

 trict is at the rate of nearly 2 feet to the mile. From a com- 

 parison of these northern stations with the elevations of deltas 

 south of Whitehall, it appears that there is a marked sag about 

 the southeastern base of the Adirondacks. 



Owing to enforced absence from the field for about a month 

 during the middle of the summer and his return to Cambridge 

 early in the autumn, Professor Woodworth did not find it pos- 

 sible to cover the area north and west of Plattsburg, in which 

 it is expected that critical evidence will be found on which to 

 distinguish the marine and nonmarine beaches of this district 

 and thus determine definitely the hight of true marine submer- 

 gence in this field. 



On account of the complexity of Professor Woodworth's sub- 

 ject and the very extensive field which he has to cover it is not 

 possible for him to make an extended report of progress till 

 further work has been done. It is expected that another field 

 season will put him in a position to make a communication of 

 much interest on the subject of his investigations. 



Incidently as pertinent to the work of the State Museum, he 

 reports the discovery of a small mass of trap rock heretofore 

 unrecorded on the geologic map near Schuylerville. This trap 

 exists in an amount above water level sufficient to afford some 



