1895. | NEW YORK ACADEMY OF SCIENCES. 81 
small Utica outcrop in the bed of the creek south of Poland, 
also presumably a case of faulting, as the formation there is 
lower Trenton. 
At the base of the type section the top of D® (page 77) seems 
to correspond in level nearly with the top of C* (page 75), a 
short distance further down stream, and although the included 
layers below C° only aggregate 19 feet 10 inches against 26 feet 
6 inches below D7 I am nevertheless inclined from their ap- 
pearance to consider them lower beds, and that some of the 
beds of D thin out before reaching C,as was the case with layer 
D 18 in the upper part of the section. Therefore substituting 
the equivalent layers of C in.D we obtain a total thickness of 
318 feet 10 inches for the typical Trenton Falls section. 
Below the bridge at Trenton Falls village, there are no out- 
crops along the creek for several miles, the single exception be- 
ing a small outcrop of nodular impure limestone at the bend of 
the creek, three-fourths of a mile below the village, near Sawyer 
Bridge, locally known as “ Frog Hollow.” The river cuts its 
way between excellent river terraces of the extensive delta de- 
posits which bury the surrounding country until Poland Bridge 
is reached. Here, on the west bank of the creek, beneath and 
just south of the bridge, are seen twenty feet of limestone in 
layers two to six inches thick, with shaly partings. A small 
stream cuts the section. The layers are especially prolific, the 
lower with large specimens of Prasopora, and about six feet from 
the top a particularly rich seam from which the following fossils 
were chiefly obtained. The fossiliferous portions are notably 
lenticular and not continuous. 
Plectambonites sericea, ventricose var. c. Orthis ( Platystrophia) biforata ce. 
Orthis (Dalmanella) testudinaria ce. Trematis terminalis c. 
Rafinesquina deltoidea c. Lingula quadrata. 
alternata ? Stenopora fibrosum. 
Strophomena planumbona ec. Ceraurus pleurexanthemus. 
incurvata. Orthis subequata. 
Asaphus platycephalus ce. Monticulipora. 
Trinucleus concentricus ¢. Orthoceras. 
Calymene c. Holopea symmetrica ¥ vr. 
Near the top of the hill, on the road leading west from the 
covered bridge just mentioned, another Trenton exposure oc- 
curs on the roadside, at an elevation of probably 150 feet above 
the former. It is a black compact, rather soft limestone and 
yielded :— 
Orthis ( Dalmanella) testudinaria a. Orthoceras. 
Trinucleus concentricus ¢. Ceraurus pleurexanthemus. 
Modiolopsis faba c. Calymene senaria. 
Rafinesquina alternata c. Nucula levata. 
TRANSACTIONS N. Y. ACAD. ScI., Vol. XV., Sig. 6, April 7, 1896. 
