418 J. M. STOLLER TOPOGRAPHIC FEATURES OE HUDSON VALLEY 



quois-Mohawk currents discharged into the Hudson Valley waters, and 

 the deductions therefrom that seem clearly warranted and have a bearing 

 on the question whether the Hudson-Champlain Valley was occupied by 

 a body of sealevel waters connecting the Saint Lawrence arm of the sea 

 with the ocean at 'New York. 



^40 Foot Terrace ZOO Toot Terrace loo Foot Terrace. 



Figure 2. — The Terraces at Mechanicsville 



The 100-foot interval contour lines are drawn from the topographic map (Cohoes 

 Sheet) of the U. S. Geological Survey. On the topographic map the 20-foot interval 

 contour lines, here omitted, show the bluffs separating the several terraces. The city of 

 Mechanicsville is located on the 100-foot terrace west of the river. 



At Mechanicsville there are three distinct terraces fronting the Hud- 

 son Valley from the west. The uppermost of these is at the 240 -foot level 

 and is a part of the well known brick-clay terrace formation developed on 



