518 NEW YORK STATE MUSEUM 



Albany, where alternating fine grained sandstone, conglomerate 

 beds and gray fissile argillaceous and arenaceous shales occur. 

 These rocks did not yield any fossils; but, as they are lithologic- 

 ally similar to the Lorraine beds of the Mohawk valley, dip regu- 

 larly at 18° -to n 80° w and are consequently outside of the 

 region of disturbance of the Hudson river valley and probably 

 continuous with the Lorraine beds of the Mohawk valley, they 

 can with a sufficient degree of certainty be correlated with these 

 beds. Furthermore, Utica shale fossils {see heloiv station 21) 

 were found in underlying rocks farther down the creek. Similar 

 shining gray fissile shales were found on the south bank of the 

 Normans kill about a mile above (west) the mouth of the Vly; 

 and an excellent exposure of Lorraine beds was met at French 

 mills, 11 miles west of Albany, where gray sandstone banks, 10 

 feet and more in thickness with intercalated shales, cross the 

 river. 



South of this neighborhood, at the Indian Ladder, the Lorraine 

 beds underlie the Manlius limestone, and yielded Dalmanel- 

 la testudinaria and Trinucleue concentricus, 

 as reported by Walcott. Other outcrops of Lorraine beds can be 

 observed at several places along the foot of the Helderberg 

 mountains. One of the best of these is that along Sprayt kill 

 at South Bethlehem, where, below the railroad bridge, some 20 

 feet of sandstone causes a waterfall and farther up, at Calla nan's 

 road metal quarry, the contact with the Upper Siluric Water- 

 lime is exposed. Numerous sandstone banks alternate here with 

 light colored, soft, argillaceous shale and some bands of more 

 sandy shale. In the shale, 18 feet below the Waterlime, a a r y - 

 n i d e s was found. These beds dip slightly southwest. A very 

 coarse sandstone with bluish green mud pebbles is expoised 4^ 

 miles farther south close below the Waterlime and Manlius lime- 

 stone along the road leading from Ravena to Aquetuck. It 

 strikes n 60° e and dips 40°, n 150° e, is hence, again involved 

 in the tilting to the east, characteristic of the Hudson valley re- 

 gion. It is doubtful whether this sandstone still belongs to the 

 Lorraine rocks or is already the sandy development of a deeper 

 terrane. Its strike wooild carry it far to the east of the Lorraine 



