2.-)N 



3. Alioul like No. 2 l>ui even darker, more fossils, and containing num- 

 erous large fragments of a yellowish, sandy limestone. . . 1 ft. '■'< in. 



2. More massive than No. 1 and lighter eolored. Wry hard. Few fos- 

 sils, some gastropods separated by rather uneven contact From 

 No. 1 1 ft. (i in. 



1. Drab, hard limestone, fine grained, light, weathering to rather thin 

 layers. Columnaria abundant throughout. Batostoma varium 

 abundant. 



The Trenton in this section lies below the base of the Trenton of the Tren- 

 ton Falls gorge, and is known as basal Trenton. The beds are massive, cry- 

 stalline and contain light weathering "pebbles," (Solenopora and Stroma- 

 tocerium). The Black river also contains similar pebbles and many angular 

 masses of hard, blue, unfossiliferous limestone. The Lowville (Birdseye) is 

 either absent or represented by a thin layer only. The Black river contains a 

 large branching Batostoma (Batostoma varium) in considerable abundance, 

 together with Tetradium and Columnaria. The latter is sometimes in very 

 large masses. 



The Strophomena is especially abundant in the massive loAver part of the 

 Trenton. 



There is a disconformity between Nos. 1 and 2 and between 3 and 4. 



The upper layers of the quarry are thin, very dark colored, with black 

 shaly partings. They are very fossiliferous, containing especially Plectambon- 

 ites, Mesotrypa and Cryptolithus. Small Bryozoa are abundant. 



The dip of the rock is variable but is generally about two degrees south- 

 west. 



The Amsterdam limestone of Cushing includes the massive beds of the 

 so-called Trenton and the Black river at this outcrop. The following species 

 were collected : 



1 . Batostoma? decipiens Ulrich r 



2. Batostoma varium Ulrich r 



3. Bythopora herricki (Ulrich) c 



4. Calymene senaria Conrad c 



5. Chasmotopora reticulata (Hall) a 



0. Columnaria halli Nicholson c 



7. Crinoid segments a. 



8. Cryptolithus tessellatus Green c 



