542 NEW YORK STATE MUSEUM 



Didymograptus serratulus and the countless num- 

 bers of D i p 1 g r a p t u s a n g u s t i f o 1 i u s, these three 

 graptolites belonging to the lower Dicellograptue zone. The gen- 

 eral aspect of this fauna, the appearance of several new species 

 of 11 m a c o g r a p t u s in it and the fact that the graptolite 

 shales of Mt Olympus on one hand lie to the northwest, that i» 

 apparently above the Diplograptus amplexicaulis beds of station 

 27, and on the other hand closely approach the Utica beds at 

 Lanfiingburg and at station 31, half a mile farther north, may 

 be taken to suggest that we have here a separate horizon. If 

 these beds do not represent another zone, but only a part of the 

 upper Dicellograptus zone, the Diplograptus amplexicaulis zone 

 would seem partly to overlie with its beds at Watervliet, 

 and partly to be intercalated into, the lower Dicellograptus 

 zone, at station 27, east of Mt Olympus, an irregularity which 

 may be also caused by the complicated folding of the region, 

 which partakes of the nature of an anticlinorium (see p. 557). 

 The entire problem, however, of the relation of these beds of 

 Lansingburg to the lower Dicellograptus and Diplograptus am- 

 plexicaulis zones awaits its solution in the tracing of the entire 

 system farther north at some future time. 



Station 31. Bluff above Lansingburg 



Directly opposite Laveny's point, station 6, in a high bluff, half 

 a mile above the Lansingburg-Waterford bridge, a fossiliferous 

 bed was found. The soft, fissile, black shale contained: 



Corynoides calicularis, Nicliolson. r 



Diplograptus sp. Small fragment 



Olimacograptus bicornis. Hall, c 



Climacograptus sp. n. c 



These beds probably belong to the horizon represented by the 

 Lansingburg fauna. 



Following these sandstones, black gray and greenish shales 

 of the Poeeten kill southward, a good section is met along a creek 

 entering the river opposite Lagoon island. Here similar rocks 

 are exposed, which, however, did not yield any fossils. 



