386 Scientific Intelligence. 



and fin lime-quarries are worked in the southeastern fronts of the 

 anticlinals. Tliis arrangement is further deversified by the dip; 

 the ridges and valleys heing narrowest where that is steepest, and 

 broadest where it is most nearly horizontal. These secondary 

 nVxuivs are verv near together here, three of them occurring: in 

 the space of six miles lineally of the ridge. Bennet's Quarry is 

 the central one of these, and has been most studied by the writer. 

 Buckley's Quarries lie south and north of it respect- 

 ,* — ^ q uarr y depends upon the extent 

 talus at bottom, and of erosion at 



There are at Bennet's Quarry, beginning at the bottom: 



taculite Limestone, Prof. Cook's Quarry Stone;* makes the best of lime 

 - purposes ; about twenty feet thick. + 



No. 3. Lower Pentamerus and Cherty Limestone; together, forty feet thick. 



No. 4. Delthyris Shale; one hundred and twenty feet thick. 



No. 5. Upper Quarry Stone ; ten feet thick. 



No. 6. Upper Shale ; one hundred and fifty feet thick. 



No. 1. Trilobite Layers; five to ten feet thick. 



No-. 5, 6 mid 7 are believed to belong to the Upper Pentamerus - 

 and are SUOG* iiskany Sandstone and Cauda Galli Grit 



fprmations, the latter exhibiting a thickness of from five hundred to eight hun- 



-iis were very kindly identified for me by Prof 

 Hall: 



from No. 1, Tentacular Linu-T >nc; /) nt.iniHr, s ■,,/,•,!.<'■ 'h *\ 

 Spn'iftr Vunnsemt, Meyambonia ovoidea, and Strophod-Mo. 



From No. 2, or Favosite Limestone, Favosites Eelderbcryi, a 

 Cyiithnphylhim, and P^itriuierus yaleatus. 



From No. 3, or Lower Pentamerus and Cherty Limestones; 

 I>ith,><i,Ht€s ph uroptyx, Piint>i,„eru& yaleatus, and a form of Lich- 



5, Upper Quarry Stone ; Rhynchonella ventricosa and 



6, Upper Shale. This subdivision is very sparingly 

 , 7, Trilobite layers; Chonetes complanata, Renssel- 



'lis, Ii,,„. ,ll,„. .tu.< V>ln»,->„\K 1 ' >' " '">" " '"'' * P 1 ' " ''"/'' >' "' 



D. ,)dcrwus.\ D. d*„tat, t . H>folithe» centennial*, 



re different from the original paper. I think the thickness was overestii 

 .-myself in this Journal, vol. xi, p. 200. Described t 



