. Bulletin - New York State Museum. Science. Fig. 30 Favosites niagarensis in thickness at Buffalo, though only the upper 8 or 10 feet carry the Eurypterus fauna. It is therefore probable that the Rosen- dale bed oorresponds only to the upper part of the Bertie, while the underlying sandstones and conglomerates (Shawangunk beds) probably are the equivalent of the lower part of the Bertie, as well as part of the remaining fSalina beds.^ ^Tbe impropriety of considering the Shawangunk grit basal Siluric in age will be apparent when we consider that it rests iineon formahli/ on the folded Hndson r
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. Bulletin - New York State Museum. Science. Fig. 30 Favosites niagarensis in thickness at Buffalo, though only the upper 8 or 10 feet carry the Eurypterus fauna. It is therefore probable that the Rosen- dale bed oorresponds only to the upper part of the Bertie, while the underlying sandstones and conglomerates (Shawangunk beds) probably are the equivalent of the lower part of the Bertie, as well as part of the remaining fSalina beds.^ ^Tbe impropriety of considering the Shawangunk grit basal Siluric in age will be apparent when we consider that it rests iineon formahli/ on the folded Hndson river strata in which are included the Lorraine or Upper Champlainic beds. It w^ould be necessary to assume that the folding and extensive erosion which the Hudson river beds suffered after Lorraine time was all accomplished during the interval represented by the Richmond beds of the west. Thus very little time is allowed for the folding and erosion of the Champlainic beds, if the succeeding beds are considered basal Siluric, i. e., Premedina as is the general practice. If however we consider the Shawangunk grit of Salina age, the folding and erosion of the Champlainic beds could have been accomplished during Palaeo- and Meso- Siluric time.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. New York State Museum; New York State Museum. Albany : New York State Education Dept