548 NKW YORK STATE MUSEUM 



and also inclose a few intercalations of coarse arenaceous beds, 

 of breccia bands and of shale. The last contains no graptolites 

 and differs from the graptolite shale by its lighter color, coarser 

 texture and more abundant arenaceous element. 



i Greenish gray silicious beds with intet'calated soft carbon- 

 aceous shale, the latter containing a considerable graptolite 

 fauna; 2 feet. The shale is a little more sandy than that of 

 the preceding graptolite beds; and the fauna, as shown by the 

 lists of fossils, is so different that it heralds the appearance of 

 a new zone. This is (jraptoUte bed 3. 



} Regular alternations of greenish gray, thinly laminated 

 silicious layers and dark gray sandy shales; 5 feet 5 inches; 

 no fossils. A thin seam of bluish black pyritiferous shale 

 with a few graptolites was observed both near the bottom and 

 top of the layers. The graptolites do net differ from those of 



bed 3. 



Jc Dark gray limestone layers; 5 feet 9 inches. The limestone 

 layers are thin, partly evenly bedded, partly exhibiting inter- 

 locking, narrowly undulating surfaces, very similar to those 

 of the European triassic " Wellenkalk." There is here also a 

 breccia 5 inches thick, with coarse sand as cement. The thin, 

 shaly partings between the limestone layers contain no grap- 

 tolites. 



I Alternations of greenish silicious beds and black shales, 

 with a 4 inch limestone breccia in the middle; 16 inches. 

 Graptolites occur sparingly and in poor state of preservation 

 in the shale. This graptolite bed Jf has the characteristic 

 species in common with bed 3. 



m Limestones which exhibit the undulating character noted 

 above still more strikingly; 16 feet. The thin shale partings 

 between the limestone layers, as in all other limestone strata 

 of the section, are destitute of graptolites. 

 n Covered; 8 feet 9 inches. 



This short break in the section is followed by the large 

 exposure in the quarry lately opened to obtain the material for 

 the construction of the dam of the Lansingburg waterworks. 



