14 ' NEW YORK STATE MUSEUM 



Dicellograptus and middle Trenton Diplograptus 

 amplexicaulis zones, and in the fauna ' of the power- 

 house of Lansingburg a probable representative of the upper 

 Dicellograptus zone^ hitherto not observed in the eastern 

 United States, was found. The islands furnished a number of 

 unexpectedly rich and interesting localities; one below the state 

 dam at Green Island with upper Utica fossils, specially lamelli- 

 branchs, and a peculiar admixture of Trenton forms; another at 

 the north end of the island with a similar fauna and some 

 interesting new forms, notably a genus of pelecypods 

 (Technophorus) hitherto not represented in New York, 

 and a cirriped crustacean (Pollicipes) thus f^r only 

 known from late Mesozoic and Cenozoic formations. On 

 Van Schaick island the construction of waterworks brought 

 out a great amount of Utica shale with characteristic 

 brachiopods and graptolites, associated with a form thus 

 far only known from the Dicellograptus beds, these beds 

 thus probably furnishing a representative of the lowest Utica 

 launa and a new horizon. On Block island a rich and typical 

 Lorraine molluscan fauna was found, such as was known before 

 only fr6m the neighborhood of Rome and the northwestern part 

 of the state. 



A conglomerate bed, which is exposed on top of Rysedorph hill 

 -about a mile east of Rensselaer, evidently continuous with similar 

 l)eds, intercalated in the Normanskill graptolite shale at the 

 Moordener kill near Castleton and Schodack landing, has fur- 

 nished fossils of Cambric, Chazy, Lowville limestone and Tren- 

 ton limestone age in such profusion that it has been made the 

 object of a special study. The considerable number of entirely 

 new forms or of forms hitherto known only from Canada and the 

 west, specially in the Trenton limestone boulders of the con- 

 lilomerate, indicate what wealth of new forms is still hidden 

 away in the Lower Siluric beds of this state and makes it 

 desirable that the Lower Siluric faunas all around the Adiron- 

 dacks should be given special attention. It is also to be ex- 

 pected that a tracing of these terranes, combined with a care- 



