FORMATIONS OF SILURIAN AGE. a 
1. Zaphrentis sp. undet. 
2. Monotrypa corrugata n. sp. 
3. Chonetes jerseyensis Weller. 
4. Rhynchonelia agglomerata n. sp. 
5. Atrypa reticularis (Linn.). 
Locality 109 B.—At Flatbrookville, along the creek below the lime- 
kiln, the lower beds of the Decker Ferry formation are finely exposed, 
and may be seen resting directly upon the Bossardville limestone. 
At this locality the beds contain a large amount of arenaceous ma- 
terial, but in the more or less calcareous beds intercalated im the 
sandstone, fossils are abundant, the commonest species being Chonetes 
jerseyensis. ‘The species which have been identified from here are 
as follows: 
Favosites corrugatus n. sp. 
Monotrypa corrugata n. sp. 
Stropheodonta bipartita (Hall) 
Orthothetes deckerensis n. sp. 
Chonetes jerseyensis Weller. 
Dalmanella postelegantula n. sp. 
Rhynchonella deckerensis n. sp. 
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Rhynchonella agglomerata un. sp. 
Atrypa reticularis (linn.). 
10. Reticularia bicostata (Van.). 
11. Whitfieldella? sp. undet. 
— 12. Undetermined ostracode. 
At Flatbrookville the only Decker Ferry fauna which has been 
observed is that of the Chonetes jerseyensis zone, above described. 
It is possible that the higher faunas might be detected after a careful 
search, but the higher beds are highly arenaceous, with fossils rarely 
present or very poorly preserved. 
Locality 167 A.—Outside of the Delaware valley the Decker Ferry 
formation occurs in the Green Pond mountain region, where it over- 
lies the red, arenaceous, Longwood shales. In this region its thickness 
does not exceed forty or fifty feet. At the period of its deposition 
the formation was probably continuous across the interval between 
the Delaware valley and the Green Pond region, thinning out to the 
east, having since been removed by erosion. The most fossiliferous 
locality in the Decker Ferry formation of the Green Pond region 
is on the Cobb property, one and one-half miles south of Newfound- 
land, and the following species have been identified from there: 
a) 
