212 NEW YORK STATE MUSEUM 



aiK?rtiii'e and the surface marked by fine lines of growth and 

 lonji-itudiual lines, strengthened at regular intervals. 



Tlie nautiloids are represented by N a u t i 1 u s ( 1) i s e i t e s) 

 111 n r c e 1 1 e n s i s [fig. 150], characterized by an angularity 

 of the umbilical mariiin of the whorl, by a noded outer or ventro- 

 lateral margin, and by a suture having a broad lateral lobe, with 

 angular saddles on the umbilical and ventrolateral margins, and 

 a rounded lobe on the venter. 



The goniatites of this limestone are represented by the large 

 and characteristic A goniatites expansus ( Vanuxem) 

 [fig. 157] (Goniatites vanuxemi Hall). This species 

 when adult is a foot or more in greatest diameter, with a large 

 living chamber, which has flattened sides and a rounded venter. 

 In the earlier stages of development the venter is flattened and 

 margined by ventrolateral ridges. The surface is furthermore 

 ornamented by sinuous ridges. The suture is simple, with a 

 narrow ventral or siphonal lobe. Parodiceras dis- 

 co ideum [fig. 158] is a smaller smooth species, with the um- 

 bilicus closed, owing to the close coiling of the shell. This char- 

 acter is shown even in the young specimens. 



Hamilton shales 



The Marcellus shales are succeeded by arenaceous beds, chiefl}' 

 more or less impure quartz sandstones alternating with silicious 

 clay mudrocks which often become shale. In the coarser sand- 

 stones, brachiopods not infrequently occur, chiefly as molds, 

 Spirifer granulosus predominating. The lower beds 

 of this series ai*e shown in the clifl: of Vroman's Nose, which rises 

 some 600 feet above the level of the Schoharie river. The lower 

 beds here are dark gray shales and thin sandstones, the former 

 becoming more blocky toward the top. In the coarser beds, 

 S p i r i f e r granulosus is common together with the 

 curioiis marking known as Spirophyton and already represented 

 in the Esopus shales. 



Another clifl; of Lower Hamilton strata is seen in the south- 

 western ])ortion of Ilartman's hill,^ east of Middloburg. These 



'So iiiUHod from ono of the early sottloments of tlie Palatines at the foot 

 of tills liill, Nvliicli was called Ilartman's Dorf. 



LI 



