84 NEW YORK STATE MUSEUM 



Crinoid stems have also been found at Marlboro. L , ( P • ) 

 s e r i c e a and O. (D.) testudinaria were found on 

 both sides of the Hudson as rather abundant and characteristic. 



The only other fossil locality in the slates which was found by 

 the writer, and which appears to be new, is at Swartoutville. At the 

 western edge of the large field across the road from the house of 

 Irving Hitchcock is a ridge composed of fissile, gray sandy shales 

 with interbedded, dense blue impure limestones. 



The shales stand almost vertical, dipping slightly to the west and 

 strike diagonally across the ridge, so that in going from south to 

 north along the ridge one passes over probably older beds. The 

 interbedded limestones are of dark blue color and carry numerous 

 traces of organic remains. The fissile shales have yielded P 1 e c - 

 tambonites sericeus, and fragments of indeterminable 

 fossils. 



Relations are very obscure, but one or two small outcrops of lime- 

 stone conglomerate were noted between these strata and the bluish- 

 gray limestone a short distance to the east. In their structural 

 relationships the fossiliferous shales probably belong with the lime- 

 stones and are probably near the base of the slate formation. The 

 slates at the west are younger. The amount of displacement be- 

 tween them is wholly problematical. 



In 1883, during the construction of the railroad along the west 

 bank of the Hudson, Messrs H. Booth and C. Lown of Pough- 

 keepsie discovered graptolites in the newly-made cuts at two locali- 

 ties, one two miles south of Highland and the other about one 

 mile north, near the place where the icehouses now stand. These 

 graptolites were identified by Whitfield as follows [the correct 

 names have been added in brackets]: Diplograptus 

 p r i s t i s Hall ; Climactograptus bicornis Hall ; 

 Dichograptus [Dicranograptus] furcatus Hall; D. 

 [Dicellograptus] divaricatus Hall ( ?) ; Monograptus 

 [Nemagraptus] gracilis Hall ; M . [Didymograptus] 

 Sagittarius Hall ; Diplograptus marcedus Hall. 

 [Cryptograptus tricornis]. He considered them as of Utica age. 

 A graptolite identified as G r a p t o 1 i t h u s [ Amphigraptus] 

 divergens was also reported from the slates one and 

 one-half miles north of Poughkeepsie on the east bank of the 

 Hudson river. This specimen is in the Vassar Institute Museum at 

 Poughkeepsie.. 



