1 6 NEW YORK STATE MUSEUM 



but at some exposures they contain brachiopods in large numbers 

 and occasionially species of the western Naples fauna. Concretions 

 in sandy shale and thin sandstones exposed at 1060 to iioo feet A. T. 

 by the side of the road leading north from Johnson's hollow, i mile 

 west of Millport, contain L i o r h y n c h u s m e s a c o s t a 1 i s , 

 Atrypa reticularis, Chonetes deflect us, Pro- 

 ductella lachrymosa, P. speciosa, Orthis 

 carinata, Ambocoelia umbonata and T a x o - 

 crinus ithacensis. In the bed of the stream, i mile west 

 of Pine Valley at 1045 feet A. T., are Orthis tioga, O. im- 

 pressa, Atrypa reticularis, Spirifer mesa- 

 cos t a 1 i s. At 1030 feet A. T., in the small ravine at the north 

 end of the quarry on the east side of Beers hill, i mile southwest of 

 Pine Valley, a soft layer in the upper part of this formation contains : 

 Phragmostoma natator, P. incisum, Buchiola 

 speciosa, Pleurotomaria itylus. The same light 

 soft shales at 1080 feet A. T., near the floor of the quarry contain 

 Manticoceras sp. Phragmostoma natator, Buchiola 

 speciosa, Palaeoneilo plana, Pleurotomaria 

 itylus, Schizophoria impressa, Productella 

 s p i n u I i c o s t a . In the upper part of the formation in the Pratt 

 quarry at Elraira fbssils are exceedingly rare, but imperfect speci- 

 mens of Manticoceras patters oni occur in a stratum 

 of clayey shale at about 1050 feet A. T. Small fragments are found 

 in small layers throughout the formation. 



High Point sandstone 



This formation, which attains a thickness of 85 feet, has some- 

 what the character of a very broad lentil with its greatest thickness 

 in the meridian of the Genesee river, where it is a homogeneous mass 

 of light bluish gray sandstone in layers 3 to 8 feet thick and aggre- 

 gating 185 feet. It thins out rapidly and becomes softer toward the 

 west and is hardly to be recognized on the shores of Lake Erie. It 

 contains no brachiopods in or west of the Genesee river section. Its 

 thickness also diminishes toward the east and gradually parts of the 

 beds become shaly. It may be traced easily for 30 miles from the 



