1895. | NEW YORK ACADEMY OF SCIENCES. 
Trinucleus concentricus. Orthoceras. 
Asaphus platycephalus. Orthis testudinaria. 
Ceraurus pleurecanthemus. Calymene senaria. 
Cyrtolites Trentonensis. Ptilodictya. 
Orthis (Platystrophia) biforata. 
5. Heavy barren layer. 
6. Comprising, with 3-5, the first waterfall, and 
forming with the layers below a zone of Holopea sym- 
metrica, not elsewhere located. 
Light gray, rather coarsely crystalline with very 
thin shaly seams and black nodules; rather impure and 
fracturing irregularly. Recurrent fauna of B+, but dif- 
ferent lithologic characters. 
Holopea symmetrica a.* Trematis terminalis. 
Stenopora fibrosum a. Lingula riciniformis. 
Prasopora lycoperdon. cequalis. 
Trinucleus concentricus. Plectambonites sericea. 
Asaphus platycephalus. Rafinesquina aternata. 
Ceraurus pleurexanthemus. Strophomena planumbona. 
Cyrtolites Trentonensis. Hyolithes. 
Gyroceras. Murchisonia. 
Orthis ( Platystrophia) biforata. Conularia trentonensis. 
7. Alternating barren and shaly layers, the jatter 
containing fragments of T’rinucleus concentricus. 
8-9. Including the base of the second fall. Light 
gray, similar to B° but not impure; has very regular 
cleavage; contains some pyrite and many fragmental 
remains of Calymene senaria, Orthis testudinaria and 
Monticulipora. 
10-11. Rather impure and finely crystalline, light 
gray and composed of comminuted fragments with 
frequent shaly partings. 
Orthis testudinaria. Stenopora fibrosum. 
subeequata. Calymene senaria. 
Rafinesquina alternata. Conularia. 
12. Shaly layer, containing only Prasopora lycoper- 
don, forming top of the second water fall. 
31’ 
41’ 
53/ 
85 
Q// 
g// 
SQ’ 
Or 
Q’ 
_ 
* Two of the specimens of this species collected in this layer, preserve the original 
shell material and one the iridescent lustre of the pearl. This isa noteworthy fact con- 
sidering the age of the fossils—lower Trenton. While several gasteropods and brachio- 
pods with preserved coloration are known from as low as the Subcarboniferous or De- 
vonian | PHILLIPS, J., Geol. Yorkshire II. 226; Sars, M., Annals and Mag. Nat, Hist. 423 
(1869); POURTALES, Bull. Mus. Comp. Zool. 126 (1868); DE VERNEUIL, Trans. Geol. Soe. 
London I. 346 (1842) Kryxrs, C. R. The Nautilus, IV., 30 (1890.)] the only record I find 
of shell color preservation from so low a horizon asthe Trenton is that of an Hn- 
doceras proteiforme from New York, described by Pror. 0. C. Marsu, Proc. Am. 
Asso. Ady. Sei. XVI. 326 (1868). 
