202 FREDERICK G. CLAPP 



In the present study particular attention is given to the first three 

 types. 



SANDPLAINS. 



Although in ascertaining the elevations of the plains the writer has 

 not had opportunity to do any leveling, yet from the excellent con- 

 touring on the new Boston sheet, and in some instances by the aid of 

 the older topographic maps, the approximate elevations have been 

 interpreted in the field. Within the immediate area under consid- 

 eration twenty-five typical plains have been studied, which are here 

 named, with their approximate heights above tide. The distribution 

 of the plains and their associated eskers is shown in Fig. 2. 



1. Newtonville plain, 150 feet. 14. Dedham plain, 120 feet. 



2. Newton Highlands plain, 150 feet. 15. Wigwam plain, 120 feet. 



3. Newton Center plain, 150 feet. 16. Islington plain, 120 feet. 



4. Winchester Hill plain, 150 feet. 17. Pegan plain, 160 feet. 



5. Nahantan plain, 150 feet. 18. Noanet plain, 150 feet. 



6. Cow Island plain, 140 feet. 19. Cedar Hill plain, 270 feet. 



7. West Roxbury plain, 140 feet. 20. South Natick plain, 120 feet. 



8. Dedham Island plain, 150 feet. 21. Trout Brook plain, 100 feet. 



9. Lower Falls plain, 150 feet. 22. Greendale plain, 100 feet. 



10. Waban plain, 150 feet. 23. Riverside plain, 60 feet. 



11. Wellesley plain, 150 feet. 24. Auburndale plain, 70 feet. 



12. Needham plain, 170 feet. • 25. Newtonville plain No. 2, 80 feet. 



13. Birds Hill plain, 190 feet. 



Where the plains slope appreciably away from the ice-contact 

 the elevation of the outer edge is taken, as representing most closely 

 the true water-level. Most of them slope slightly, the difference in 

 elevation sometimes amounting to as much as 20 feet, which makes 

 it evident that plains having elevations given as 150 feet and others 

 as 170 feet might have been formed as deltas in the same body of 

 water. That such was probably not the case will be shown below. 



In addition to the plains already enumerated, several exceptionally 

 fine developments outside the Needham area have been visited in 

 this connection. The most important of these are as follows: 



26. North Wellesley plain, 170 feet. 29. South Framingham plain, 170 feet. 



27. Pickerel Pond plain, 170 feet. 30. Medfield lunction plain, 170 feet. 



28. Cochituate plain, 170 feet. 



A comparison of the elevations of the thirty deltas shows that 

 twelve of the number have an elevation of 140-50 feet, six of them of 



