620 



Report of the State Geologist. 



Trenton Falls. 



The rock section begins near the southern end of the path on the western 

 side of the gorge and extends to the top of Prospect quarry, a distance of 

 about two miles. The path may be followed for a short distance below the 

 hotel stairs ; but the lowest rocks, stratigraphically, are exposed in the 

 Narrows above this point. At the water level below the hotel stairs, is the 

 base of Mr. White's section D of station No. 130, which also extended from 

 this locality up the gorge to the Prospect quarries. Section C, No. 130, on 

 the eastern side of the gorge below Section D, was studied by Mr. White, 

 but apparently no considerable thickness of lower rocks was found. 



Section of Trenton Falls Gorge.* 



A}. The lowest rocks exposed along the path on the western side af^M 

 of the gorge, are twenty-four feet thick at the Narrows, and on account 

 of the heavy dip down stream, show only the upper eleven feet at the 

 southern end of the path. The upper part is composed of thin layers, three 

 to five inches thick, which form a somewhat clearly denned band two and one- 

 half feet thick. This is Nos. 3 and 2 of White's section. Below this band 

 are similar limestones with shaly fossiliferous partings. In the Narrows, the 

 lowest layers are compact bluish grey, thin-bedded limestones, interstratified 

 with coarser-grained layers containing numerous well-preserved specimens of 

 Monticulipom (Prasopora) Vycoperdon. The more compact layers are 

 unfossiliferous. In the Narrows are shown Nos. 3, 2 and 1 of White, and 

 apparently about thirteen feet of lower rocks. 



1. Montioulvpora (Prasoiiord) lycoperdon, (Say). (aa)f 



2. Orthis (Dalmanella) testudinaria, Dal. (r) 



3. Plectamhonites sericea, (Sowb.), Hall and Clarke. (r) 



4. Ceraurus pleurexanihemus, Green. (r) 



5. Crinoid segments. 



A 2 . Heavy bed of compact, regular, thin-bedded, very dark blue ,^='34 

 limestone, from eight to ten feet thick, which separates into layers from three 

 to ten inches in thickness, divided by. shaly partings. This heavy bed is 

 prominently shown along both sides of the gorge from the southern end of 

 the path on the western side, to the upper part of Sherman fall. At the end 

 of the path, where the rods are placed, the base of this bed is about eleven 



* Station No. 48, Section A. Union College Survey. 



fTuc relative abundance of the species is indicated in the following manner: a = abundant ; aa = very abundant ; c = com- 

 mon ; r = rare ; rr = very rare, when but one or two specimens have been found. 



