538 



F. G. CLAI'P GLACIAL PERIOD IN NEW ENGLAND 



In 1878 Hitchcock described fossiliferous clays interstratified between 

 two tills at Portland.* The same writer has observed till overlying strati- 

 fied clays and gravels at many places in New Hampshire.! 



In the same work Upham Jdescribes numerous exposures of till resting 

 on stratified clay in the vicinity of lake Winnipiseogee. Upham inter- 

 preted the phenomena, however, as being due simply to the washing of 

 material on top of the clay from melting of a neighboring glacier and not 

 to anjr retreat and readvance of the ice. 



Chalmers, in 1893, § described an exposure of stratified clay underlying 

 till at Nogrotown point, New Brunswick, giving sections and fossils 

 (column 25, pages 530-523). One of his sections is as follows: 



Section at Fern Ledges, near Saint John, 'New Brimstvick 



Material Feet 



4. Till with boulders up to 1 foot in diameter 13 



3. Till with boulders up to 6 feet in diameter 25 



2. Stratified, tough, dark red clay containing a few pebbles and occasion- 



ally a boulder 14 



1. Till 10 



Total ,. 62 



The following section is also rejjorted from near Nogrotown point: 

 ■ Section one-fourth Mile West of Nogrotown Point, Neiv Brunsivick 



Material Feet 



4. Till 11 



3. Stratified till l 



2. Till containing 7 species of fossils (see column 25, pages 520-523) 10 



1. Stratified, dark red, tough clay with a few boulders, containing 7 species 



of fossils (see column 25, pages 520-523) 20 



Total 42 



There seems to be no pa,rtiGular evidence from the report whether the 

 above described deposits are pre-Wisconsin and Wisconsin, or whetlier 

 they are Gardiner and Montauk, but the former hypothesis is believed to 

 be true. 



The following are a few of the instances of till overlying clays seen by 

 the writer : 



• Geology of New Hampshire, vol. iii, pp. 279-282. 



t Op. cit, p. 290. 



t Op. cit, pp. 131-138. 



§ Bull. Geol. Soc. Am., vol. 4, pp.- 361-370. 



