AN EURYFTERID HORIZON IN THE NIAGARA. 
3 
The depth of excavation was 3 to 4 feet, the fauna being entirely 
confined to this horizon. Fragmentary fossils were also found 
in place and it appeared that most of the remains were contained 
in about 6 inches of strata. The horizon is about 25 feet below 
the base of the Guelph formation. 
THE FAUNA. 
The following species were found at the above described 
locality. Lichenalia concentrica Hall, Monomorella cf. orbicularis 
Billings, Orbiculoidea subplana (Hall), Orthis ? near tenuidens 
Hall, Camarotoechia whitei (Hall) ?, Spirifer radiatus Sowerby ?, 
Whitfieldella nitida Hall ?, Anoplothepa ? sp., Meristina ? sp., 
Conularia niagarensis Hall ?, Conularia sp., Eusarcus logani sp. 
nov. Some other poorly preserved fossil material was found, which 
has not been identified. Some fragments appear to be crinoid 
columns. 
Not only are the fossils all from the same horizon, but 
numerous Orbiculoidea occur on the same slabs with Eusarcus 
fragments and also resting upon Eusarcus telsons. 
FAUNAL AFFINITIES. 
From the occurrence of the genus Eusarcus in the fauna 
of the Eramosa beds we are led to compare this fauna with others 
also including Eusarcus. Three Silurian horizons have furnished 
this genus, viz., the Bertie 1 waterlime of New York and Ontario, 
the Kokomo 8 waterlime of Indiana, and the shale beds of the 
Shawangunk 3 grit of eastern New York. The Bertie waterlime 
and Shawangunk grit possess only crustacean faunas, and as 
Eusarcus logani is quite unlike species found in them it is conse- 
quently difficult to make comparisons. In the case of the Ko- 
komo 4 waterlime of Indiana, it is different. Eusarcus newlini 
of that horizon is perhaps more closely related to E. logani 
1 Pohlman, Julius. Buffalo Soc. Nat. Sci., Bull. 5, 23, 1886. 
•Claypole, E. W., Am. GeoL, Vol. VI. pp. 258-260, 1890. 
* Clarke, J. M„ and Ruedemann, Rudolf, N.Y. State Mus. Bull. 107, p. 295. 
4 The Age of the Kokomo according to Clarke and Ruedemann is Lockport: N.Y. State 
Museum Memoir 14, 1912, Vol. I, p. 87. Kindle, however, concludes that it is "either a Salina 
or Cobleskill horison." Am. Jour. Science, Voi. XXXVI, Sept., 1913, p. 288. 
