1877.] D^J [Ashburner. 



59. Gray, slialy, argillaceous limestone alternating with 

 greenish-gray lime-shale (local deposit?) 20' 



58. Black fissile slate and shale, surfaces verj'- much stained 

 with iron and coated with bituminous matter 100' 



57. Black slate and brown shale, surfaces stained with iron 

 and coated Avith bituminous matter ; the shale in the lower 

 part directly above the iron ore bed is very argillaceous 180' 



56. Marcellus iron ore bed, varying thickness 4' 



Upper Helderberg {Post Meridian) Limestone 60' 



55. Dark blue limestone containing seams of calcite 4' 



54. Dark brownish-gray argillaceous lime shale 2' 



53. Dark blue argillaceous limestone 2' 



52. Dark bluish-gray lime shale and light olive calcareous 



shale 7' 



51. Dark greenish-gray lime shale 1' 



50. Concealed. Shaly limestone (?) 7' 



49. Dark olive calcareous shale easily weathered 22' 



48. Massive gray argillaceous limestone 5' 



47. Fragile dark olive and yellow argillaceous limestone. . • 10' 



46. SchoJiarie and CaudagalU, both wanting, but perhaps represented 

 by clay and shale on top of the Oriskany. 



No. VII. 



OrisTcnny ( Meridian) Sandstone 58' 



45. Upper partocherous clay, lower part coarse-grained fer- 

 ruginous and calcareous sandstone 12' 



44. Friable sand containing pebbles size of a pea 15' 



43. Coarse-grained arenaceous sandstone more fragile than 

 above and breaks into more irregular shapes. Mass stained 

 with ferruginous matter and surfaces coated with red hematite. 

 Contains : Cyrtoceras expansus, Dalmania micrihrus, Eatonia 

 peculiaris, Megambonia lamellosa, Orthis hipparionyx, Platy- 

 ceras ventricosa, Pterinea texilis, Bensselmria marylandica, 

 Rensselmria ovalis, Bensselmria ovoides, Spirifer arenosus, 

 Spirifer arrectus. Oriskany hermatite ore bed, locally de- 

 posited at the lower horizon 31' 



Silurian. 



No. VI. 



Lower Helderberg. 



Letoistown (Pre-meridian) Limestone 162' 



42. Partly concealed. Upper part composed principally of 

 shaly, argillaceous limestone with probably a few beds of crys- 



