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Description of Plate VI, 



Fig. I. Fossil ripple marks (Palseophycus flexuosus, James), . . . .129 



Fig. 2. Fossil mud washings (Aristophycus ramosum, M. & D.), . . 130 



Fig- 3- Fossil rain marks (Chloephycus plumosum, M. & D.), . . . 130 



Fig. 4. Fossil rill marks from the Carboniferous — after Dawson, . . 131 



Fig. 5. Fossil rill mark (Trichophycus sulcatum, M. & D.), . . . . 131 

 Fig. 6a. Dumb-bell fossil — after Hall. 



6b, Dumb-bell fossil — after Billings. 



6c. Dumb-bell fossil — Col. Cin. Soc. Nat. Hist. (Arthraria antiquata, 



Billings . . 131 



