Review of the New York Geological Reports. 165 
The Genesee slate affords but few fossils, and these are found 
in its upper portion. The following species, figured in Vanux- 
em’s Report, are tolerably abundant in its eastern extension near 
Lodi in Seneca county, and Bigstream point, ravine near Ogden’s 
ferry and Cayuga lake. 
Vanuxem’s Report. (42.) 
Q 
Fig. 1. Orbicula lodensis. 2. O. quadricostata, 3. Lingula spatula. 4. L. 
concentrica. 
These occur in the upper twelve or fifteen feet of the mass, 
and are rare in the western part of the state. 
Vanuxem found, also, a long linear smooth leaf of grass or sea- 
weed. 
Vanuxem’s Report. (94.) 
2 
Fig. 1.2. Avicula fragilis. 3. Strophomena setigera. 4. Tentaculites fissurella. 
In the fourth district the Avicule of this wood-cut are the most 
prevalent forms, especially on Lake Ene. It is remarkable that 
1, 2, 3, are the same species found 1 
recurring after a long interval in rocks w 
other. ‘The similarity of composition, 
for this analogy in organic remains. __. 
the western equivalency of the Genesee slate we have else- 
Where spoken. : uh f 
Portage or Nunda Group. (Part of F. No. 8* of Pennsylvania 
and Virginia. Post-medidial Flags of Rogers.) In the Annual 
Reports the strata comprehended in this group were described 
Peal, puke “Si onan amaie a ol 
idely separated from each 
without doubt, accounts 
* In the New York Reports it is laid down as part of F. 9 of Pennsylvania and 
Virginia, but we believe this to be incorrect. 
