CUSP ATE FORELANDS AT BAY OF QUINTE 



129 



bars, which in form will approximate in shape to the typical V- 

 terrace and V-bar. 



THE ORIGIN OF THE V-TERRACE AND V-BAR. 



Four of the forms which have been described in the preceding 

 paragraphs agree very closely, both in form and location, with 

 Gilbert's description of the type examples 

 in Lake Bonneville.' 



In his descriptions of the type examples 

 Gilbert notes that: 



They are built against coasts of even outline, usually 

 but not always, upon slight salients, and they occur 

 most frequently in the long narrow arms of old 

 lakes. 



In discussing the origin of the form he 

 states : 



In some cases the two margins appear to have 

 been determined by currents approaching the terrace 

 (doubtless at different times) from opposite direc- 

 tions ; and then the terrace margins are concave out- 

 ward, and their confluence is prolonged in a more or 

 less irregular point. In most cases, however, the 

 shore drift appears to have been carried by one cur- 

 rent from the mainland along one margin of the ter- 

 race to the apex, and by another current along the 

 remaining side of the terrace back to the mainland. 

 The contours are then either straight or convex. 



The bars which border the terraces he attrib- 

 utes to a later period during a slight deepen- 

 ing of the waters of the lake, after the ter- of about 500 yards at the 

 races had attained their full size. While the ^P^^ °^ ^^^ portion of 



, , , 1 , , 1 1-1 1 1 1 , • Amherst Bar above water 



lake stood at the higher level, the Imear , , ^ . 



° ' level on May 25, 1903. 



embankments were built at the outer mar- Direction of wave advance 

 o-ins. shown by the arrow. 



The author's studies of the forelands in the Bay of Ouinte 

 lead him to suggest the following hypothesis as to the mode 

 of origin of the forms here described. In the first place, 

 it must be noted that the level of the water in the bay varies 



Fig. 12. — Sketch plan 



U. S. Geological Survey, Fifth Annual Report, 1883-84, p. 



