DECEMBER 15, 1899.] 
3. Canadian. This term has the prestige of time 
and priority. , 
4. Mohawkian. Conrad and Vanuxem made use 
of the term ‘Mohawk limestone’ for certain of 
the calcareous layers beneath the Trenton, but they 
differed so widely in their application of the term 
that in the summation of their results, the geologists 
decided to abandon it. The name is here revived 
with a broader meaning. The valley and watersheds 
of the Mohawk river afford typical exposures of all 
members of the group. 
5. Cincinnatian. The formations of the Neo- 
champlainie are not as completely developed in the 
State of New York as in Ohio and Indiana. In the 
latter sections the Lorraine fauna is represented, but 
is followed above by the well-defined fauna of the 
Richmond beds. Probably in no other region is the 
succession of these faunas so complete as about Cin- 
cinnati, and this fact justifies the recognition of the 
term Cincinnatian, which already has historic value. 
For a full description of th series by Winchell and 
Ulrich, see Geol. and Nat. Hist. Surv. of Minn., vol. 
3, pt. 2, pp. ci-cv., 1897. 
6. Oswegan. This name is appropriate on account 
of the widespread occurrence of the Oneida and Me- 
dina formations in Oswego County, N. Y. Vanuxem 
employed the term ‘ Oswego sandstone’ for the forma- 
tion subsequently and by common consent called 
Medina sandstone. In reviving the name, though 
with a broader meaning than in its original use, it 
derives its title from its early date. 
7. Niagaran. In the sense suggested by Professor 
Dana. 
8. Cayugan (new). The divisions of this group are 
knit together by lithologic and faunal characters and 
are distinctly Ontaric. The outcrops are typically 
exposed about the north end of Cayuga Lake, N. Y. 
9. Helderbergian, The present state of our knowl- 
edge does not permit the use of the term Helderberg 
in its original scope. The ‘ Helderberg division’ was 
made to embrace formations now regarded as consti- 
tuting the lower and part of the middle Devoniec, 
We propose to restrict the term Helderbergian to the 
formations currently known as ‘ Lower Helderberg,’ 
excluding the ‘ Tentaculite limestone.’ 
10. Oriskanian. The Oriskany formation varies 
considerably in the character of its sediment. Its 
ealeareous facies is highly developed in eastern New 
York, while the more siliceous sediment excludes all 
others in the central part of the state. The fauna of 
the Oriskany from its lowest beds, as at Camden, 
Tennessee, to its highest beds, as in the Province of 
Ontario, shows progress in differentiation, but it is 
not yet practicable to subdivide the New York de- 
velopment of the fauna. 
SCIENCE. 
877 
11. Ulsterian (new). From the outcrops of all 
the members in Ulster county, N. Y. 
12. Erian. The ‘Erie division’ comprised the for- 
mations from the top of the Onondaga limestone to 
the top of the Chemung. We propose to save the 
term to the New York nomenclature by reviving it 
with a restricted meaning. 
13. Senecan (new). In Seneca county and along 
the shores of Seneca lake are excellent exposures of 
these beds. 
14. Chautauquan (new). From exposures in Chau- 
tauqua county, N. Y. 
15. Beekmantown limestone (new). The Calcif- 
erous sandrock of Eaton and authors generally. 
This formation took its original name from sections 
in the Mohawk valley, where the rocks are without 
fossils. At Beekmantown, N. Y., the normal fauna 
is finely developed and the rock section essentially 
complete. : 
16. Lowville limestone (new); instead of Birdseye 
limestone of common use. Lowyille is a town in 
Lewis county, N. Y., where these beds are well ex- 
posed. 
17. Hudson river beds. It is becoming increas- 
ingly evident that the great mass of shale in the Mo- 
hawk and Hudson river valleys which was desig- 
nated at an early date by this term is resolvable into 
horizons extending from the middle Trenton to and 
including the Lorraine beds. At present it seems 
unlikely that when this determination of horizons 
has been carried through the series any part will re- 
main to which the original term can be applied by 
virtue of its distinctive fauna, though it may still 
serve to designate a facies of the formations men- 
tioned. 
18. Rondout waterlime (new). From the fine 
development of these beds in the extensive cement 
quarries at and near Rondout, N. Y. 
19. Manlius limestone. Tentaculite limestone of 
Gebhard, Mather and later writers. The name here 
used was introduced by Vanuxem and is entitled to 
first consideration. Manlius is the place of typical 
exposure in Onondaga county, N. Y. 
20. Coeymans limestone (new); and 
21. New Scotland limestone (new). These terms 
designate respectively the Lower Pentamerus (Hel- 
derberg and Pentamerus limestones of the New York 
geologists) and the Catskill or Delthyris shaly lime- 
stone. Coeymans and New Scotland are adjacent 
towns in Albany county, N. Y., through which runs 
the Helderberg escarpment affording the finest ex- 
posures of these formations. 
22. Becraft limestone. This name was introduced 
by N. H. Darton with the sanction of Professor James 
Hall, for the beds previously known as the Upper 
