636 



Report of the State Geologist. 



L> 7 . Black carbonaceous shale at the base of the Utica formation; i 9 F< ' e ~s7 

 nineteen feet exposed on the hill near the Eysaman house.* 



Yanuxem, in describing the rocks about Little Falls, states that "the 

 gneiss rises at the east end to the height of a hundred feet," while the Cal- 

 ciferous is given as having "a thickness of over 200 feet."f In each case it 

 will be noticed that the thickness is more than twice as much as Vanuxem's 

 estimate. Darton gave the thickness of the Calciferous as from u 200 to 25<> 

 feet on the Mohawk," % while the Birdseye is mentioned as having a thickness 

 of "four feet about Little Falls."§ On the south side of the east and west 

 road west of the Eysaman house is an old quarry and lime-kiln, known as the 

 Cook quarry, in which the contact of the Birdseye and the Trenton limestones 

 is clearly shown. 



Section of the Cook Quarry. 



XL YLL C n . Fine-grained, dove-colored Birdseye limestone. In 4^=^ 

 the lower part of the quarry are exposed four and one-half feet, composed of 

 the three following layers in ascending order : two feet and three inches, one 

 foot and five inches, and nine inches. The vertical, small Phytopsis markings 

 were present, but no other fossils. 



C n . Thin, irregular layers of dark-colored Trenton limestone i 2 i| e =i7 

 somewhat crystalline and highly fossiliferous ; twelve and one-half feet are 



exposed in the quarry wall. 



1. Orthis (Palmanelld) testudinaria, Dal. (aa) 



2. Ortliis {Dmorthis) pectinella (Emm.), Hall and Clarke, (c) 



3. Pajmesquina alternata (Con.), II. and ('. (r) 



4. Pleetamhonites sericea (Sowb.), H. and C. (c) 



5. Asaphus plafycephalus, Stokes. (r) 



6. Stictopora cf. acuta. Hall. (r) 



7. Monticulipora {Prasopora) l/ycoperdon, (Say). (r) 



8. Crinoid segments. 



On the south side of the river opposite the central part of the city is a 

 nearly perpendicular cliff of massive Calciferous sandrock, 300 feet in height. 

 About 170 feet above the base is a four-foot stratum containing specimens 

 apparently of Oryptozvon proliferv/m, Hall. Below the Calciferous sandrock 

 is the gneiss w hich is excellently shown in the West Shore railroad cut east 



* Recently Mr. M. L. Havilaud and other students of Union College, measured the section north of Little Falls. They 

 obtained a thickness of 217 feet for the Laurentian gneiss : 446 feet for the Calciferous; 81 for Ihe Trenton, anil 27 feet of Utica 

 slate to the top of the hill. c. s p. 



t Geology of New York, Part HI , 18-12, p. 30!). For the thickness of the Calciferous, sec also p. 32. 



X Thirteenth Annual Report State Geologist [New York], 1804, p. 418. 



§ Ibid., p. 422. 



