34 NEW YORK STATE MUSEUM 



Verdrietege Hook. It follows along the eastern side of Rockland 

 lake and thence northwestward, but for several miles the sand- 

 stone is nowhere exposed near it. But just south of the entrance 

 to the tunnel of the West Shore railroad, near Long Clove, the 

 contact is finely shown. The relations here have been pictured 

 and described by Darton, 1 and are represented in figure 7. The 

 trap ascends by steps across the sandstone, which has been altered 

 for a distance of 20 feet from the contact. This exposure better 

 than any other shows the dike-like character of the upper con- 

 tact. The sandstones dip gently westward (away from the obser- 

 ver in the diagram), and the contact line crosses their strike at a 

 steep angle. 



Outcrops of highly indurated shale (hornfels) and trap occur 

 along the road leading south from Long Clove in such relation- 

 ship to each other as to show that the line of contact is here an 

 irregular one. The shales dip northeast toward the trap at a steep 

 angle, the departure from the normal westward dip being prob- 

 ably due to deformations caused by the intrusion of the trap. 



West of Short Clove the border is very irregular in places. In 

 general it lies above and to the north of the road skirting the 

 ridge, but it often changes abruptly in elevation and direction, 

 showing that the trap must zigzag across the sandstone beds in 

 a more complicated manner than farther south. Its dike-like 

 character is clearly evident. The relations shown by figure 8 

 were noted near the corner, where the road turns south to New 

 City. The contact is exposed for a distance of 4J feet. The 

 sandstone dips away from the observer and obliquely to the left 

 (west) and shows no signs of metamorphism near the trap, a 

 somewhat unusual occurrence. The contact line here trends 

 northward, nearly at right angles to its general course. 



A mile farther west there is some evidence that a small tongue 

 of trap extends from the main mass into the sandstone, but the 

 exact relations are obscured. Outcrops of sandstone are common 

 for several miles west of Short Clove, and the location of the con- 

 tact line can generally be accurately determined. 



lDarton, N. H., U. S. geo. sur. Bui. 67, p. 51 and fig. 26. 



