690 NEW YORK STATK MUSEUM 



line of the liighways connecting Syosset with towns on the nortliern 

 side of the ridge. 



The northern plains varying from 190 to 220 feet in elevation are 

 well developed ahout East Norwich. Their snrtace is roughened 

 and is usually more uneven than the 20 foot contours of the accom- 

 panying map can be made to indicate. These upper plains frequently 

 overlook like a terrace lower levels of much more uneven surface 

 near the 100 foot level, as between Manhasset hill and Flower hill, 

 between Greenville station and Glenwood landing, and on the borders 

 of Mill Neck creek. The terraciform slopes are like the sides of 

 those valleys which dissect the rude plains, usually irregular, roughly 

 lobate or cuspate, and sloping without sharp demarcation into the 

 lower grounds which they overlook. The northern margin of these 

 dissected plains often reveals them as mere narrow ridges with 

 rounded summits, and with small bays or marshes on either side, as 

 at Mill Neck. 



The broad southern plain needs little more description beyond 

 that already given than to note a low ridge, about 20 feet in eleva- 

 tion and from a mile to 2 miles wide, springing out from the 

 plain near Lynbrook, and extending southwestward parallel to the 

 main ridge farther north, till it is cut off by the sea at Far Rocka- 

 way. Associated with this ridge is the semicircular depression on 

 the west known as Jamaica bay, largely marsh-tilled, and an exten- 

 sion of this feature in the region of Broad channel. Along both 

 north and south shores are bars and beaches, with cliffs, produced by 

 the recent work of the sea. 



A summarized view of the island in this region would be fairly 

 represented in a cross-section, such as that shown in fig. 1, in which 

 the northern, rude, terraced plains rising rather abruptly above the 

 sound are succeeded on the south by the main ridge and the out- 

 lying knobs, from which there stretches a broad plain sloping south- 

 ward to the sea or confronted near Far Rockawav hv a low ridtre, 

 bevond which in turn lie the south beaches. 



Flir 1 Diafrrammatic cixxi ■ ectioa of Long Island near the boundary line of Queens and Nas- 

 «ui counties 



