rabssKB.] DELAWARE KIVEK SECTION. 43 
Hudson river in Ulster and Green counties, called commercially the 
"North River stone." The ninty-first milepost is in the first railroad 
cut a short distance north of the railroad bridge, at which locality is a 
fine exposure of the irregular concretionary structure, some of the 
concretions being very large. Prof. White stated: "The Chemung 
rocks rise from the Delaware about 300 yards above the ninety-second 
New York milepost on the Erie Railroad. This is about one-half mile 
above the Erie Railroad bridge and 4 ( ! r miles from Port Jervis/' 1 It is 
quite clear that the ninety-first milepost is meant, since the distance 
from the railroad bridge shows that it is not the ninety-second one. 
Fauna of No. 1477 A4. 
Spirifera mesastrialis Hall (rr) 
Paheoneilo emarginata (Con.) Hall (rr) 
Leda di versa Hall (r) 
Microdon (Cypricardella) tenuistriatus Hall (?), possibly M. gregarius Hall, 
but it resembles the former more elosely (rr) 
Orthonota carinata Con (rr; 
Palaeoneilo plana Hall (rr) 
Paracyclas lirata (Con. ) Hall (rr) 
Grammysia subarcuata Hall (?) (rr) 
Modiomorpha mytiloides (Con. ) Hall (?) ( rr) 
Small specimen which closely resembles the young forms of this species as 
given in figs. 2 and 3 on PI. xxxvin (Geol. Surv. N. Y., Palaeontology, 
Vol. v, Pt. i, Lamellibranchiata n). 
Modiomorpha subalata (Con. ) Hall var. chemungensis Hall( ?) (rr) 
Leiorhynchus sp?, specimens intermediate between L. multicosta Hall and L. 
mesacostalis H all : ( it) 
Actinopteria boydi (Con.) Hall (a) 
( ?) Psilophyton prinoeps Dn., broken fragments of plant stems (r) 
( ?) Crania sp., or possibly Disciua sp (rr) 
No. 1477 A5. — Exposures of bluish sandstone and shales on the western 
bank of river about opposite the Saw Mill Rift siding of the Erie Rail- 
road, and a little more than 900 feet above the ninety first milepost. 
(This is probably near the horizon of the place indicated by Prof. 
White as the top of the Chemung, since on the opposite side of the 
river, a short distance above this point, heavy sandstone ledges begin 
to appear which are probably Starucca.) The upper exposures at this 
locality are thin greenish-gray sandstones, alternating with blue argil- 
laceous shales. A little farther down, one of the heavy irregular layers 
is near the level of the river, and the sandstones of this exposure are 
blue and fine grained. The blue shales contain fragments of some 
fossils, as Homalonotus dekayi (Green) Emm. 
Fauna ok No. 1477 A 5. 
Homalonotus DeKayi (Green) Emm (rr) 
Paheouelio emarginata (Con. ) Hall var. (?) (rr) 
( ?) Psilophyton princeps !)u (rr) 
Aviculoid shell (rr) 
Gasteropod shell (rr) 
>G«, p. 1114. 
