ANCIENT WATER LEVELS OF CH A MPLAIN— HUDSON VALLEYS 213 



I collected in the delta sands south of the railroad station at 

 an altitude of about 155 feet above sea level rather abundant 

 Ma co ma groenlandica, common S a x i c a v a rugosa, 

 a few Led a portlandica, fragments of a Balanus, two 

 specimens of C y 1 i c h n a alba ( ?) . In the same horizon Mr 

 P. T. Ooolidge, of Watertown Mass., found in 1903 a fragmentary 

 M y t i 1 u s e d u 1 i s. At a lower horizon about 25 feet above 

 the lake and 3 feet below the top of the clay Mr Coolidge found 

 M j t i 1 u s e d u 1 i s common, Mac oma groenlandica 

 rather common, and one specimen of Saxicava rugosa. 



Mr Coolidge has also found shells in clay about 15 feet above 

 the lake on the south side of the swamp 1 mile north of Port 

 Kent. This locality afforded Saxicava rugosa common, 

 L e d a a r c t i c a and Macoma groenlandica, together 

 •with an undetermined iamellibranch. 1 



Fossils at Willsboro. Macoma groenlandica and 

 M y t i 1 u s e d u 1 i s were collected from the clays in the road 

 glitter 14 mile west of the railroad station, and south of the 

 station at an elevation of about 220 feet above sea level. The bed 

 of shells at this locality is 3 inches thick. 



Fossils on Croimi Point Peninsula. Macoma groen- 

 landica was observed in the clays a few feet above the lake 

 level on the west side of Crown Point fort ruins at an elevation of 

 about 110 feet above sea level. This is the southermost point at 

 which I have observed marine shells on the New York shore of 

 Lake Champlain. 



Marine shells on the Vermont shore. The Vermont geologists 

 have reported a number of localities at which shells have been 

 found in the clays in that state. The following abstract of the 

 reported occurrences has been made with the view of comparing 

 the elevation and southward extension with the occurrences 

 known in New York. 



According to the Vermont report of 1861, fossil marine shells 

 were found at Swanton at an elevation of 140 feet; at Milton 

 Falls, the highest locality, at 298 feet; at Colchester, at 320 feet; 



1 While this report is passing through the press Mr Peet reports fossils at 

 300 feet elevation back of Port Douglas on the south of Trembleau moun- 

 tain. Jour. Geol. 1904. 



