610 



HISTORICAL GEOLOGY. 



LIFE. 



Plants. — In the Portage the remains of land plants are rare. There are 

 stems of species of Lepidodendron — L. Chemungense and L. 2)rimcevHm; of 

 Lycopodites and Knorria; of CijdosUgma—C. affine Dn.; of Calamites — 

 Bornia inornata Dn.; oi Tvee-f evns,Asterochlcena(Astero2Jtens) Noveboracensis 

 Dn., from Milo, N.Y. ; and woods of Gymnosperms, as Cordaites (formerly 

 Dadoxylon) Clarki Dn. Sporangites {S. Huronensis) occur in the more bitu- 

 minous portions of the Genesee shale. 



931. 







\, 



Dictyo-cordaites Lacoei, Dawson (1): a, venation of leaf ; 6, fruit enlarged. Dawson, '89. 



The Chemung la,n.d plants discovered include those of the Portage and 

 others. Some of them are represented on page 609. Figs. 926, 927, 928 show 

 portions of plants from the Chemung of Gilboa, N.Y. ; 928, from the Catskill 

 beds of Montrose, Pa. ; 929, from Pottsville, Pa., and Franklin, N.Y. The 



