ROOKS. 



37 



Names. Localities, etc. 



44 Medina sandstone. Martville, Cayuga. 



45 do (inclosing nodules of shale). Rochester. 



46 do (with Arthrophycus harlani). Wayne. 



47 do (variegated and shaly). Medina. 



48 do (shaly). Lewiston. 



49 do Kedfield, Oneida. 



50 do (upper shaly layers). Medina. 



51 do (variegated). Lewiston. 



52 & 53 do (upper greenish layers). Lewiston. 



54 do (upper gray layers, with Gytherind cylindrica). 



Medina. 



55 do (variegated). Near Martville, Cayuga. 



56 do (variegated). Lewiston, Niagara. 

 67 do Rochester, Monroe. 



58 do (very shaly). Irondequoit bay, Monroe. 



59 do Medina, Orleans. 



60 do (with ZiZw^wZa cimeata zxACytherina cylindrica). 



Medina. 



61 & 62 do (with nodules of shale enclosed). Medina. 



63 & 64 do (with Lingula cuneata). Lockport and Medina. 



65 do (with L. cuneata and Pleurotomaria pervetusia). 



Medina. 



66 do (with L. cuneata). Medina. 



67 do Clarendon, Orleans. 



68 do (with tortuous lamination). Rochester. 



69 - 71 do (shaly variety). Lewiston. 



72 do (shaly). Rochester, Monroe. 



73 do (shaly). Martville, Cayuga. 



74 do (with C. cylindrica and L. cuneata). Medina. 



75 do (with concretionary surface). Oswego. 



76 do (with Artkrophycus harlani). Medina. 



77 do (with A. harlani). Adams's basin, Monroe. 



78 do (with Fucoides? heterophyllus). Adams's basin. 



79 & 80 do (with F.? heterophyllus). Medina. 



