INDEX TO ROCHESTER AND ONTARIO BEACH QUADRANGLES 35 



Polypora incepta, 19. 

 Poterioceras sauridens, 27. 

 Potsdam sandstone, thickness, 8. 

 Proetus sp., 27. 

 Protean group, 13. 

 Pseudoniscus roosevelti, 29, 30. 

 Pterinea, 29. 



emacerata, 19, 30. 



subplana, 26. 



undata, 19. 

 Pterygotus monroensis, 30. 



Reef structures in Irondequoit lime- 

 stone, 16. 



Rhipidomella hybrida, 19, 26. 



Richmond beds, 9 ; and Oswego 

 sandstone, equivalency, 9. 



Ridge road, 6. 



Rochester, situation, 6 ; Lockport 

 dolomite, 7. 



Rochester shale, 8, 17-19; thickness, 

 18. 



Rondout waterlime, 7. 



Rosendale waterlime, ^2. 



Ruedemann, Rudolph, cited, 9, 19, 23- 

 24, 25-26. 



Sagenella membranacea, 19. 



Salina formation, description, 27-32 ; 



thickness, 27. 

 Salina period, 7, 10. 

 Sandy creek, 28. 

 Sarle, C. J., cited, 12, 16, 28, 29. 

 Schuchert, Charles, cited, 9, 17. 

 Semicoscinium tenuiceps, 19. 



Sequence of events preceding deposi- 

 tion of rocks of Rochester area, 

 8-10. 



Shawangunk conglomerate, eurypte- 

 rid fauna, 29. 



Smythe, C. H. jr, cited, 14. 



Sodus shale, 8, 13. 



Spirifer crispus, 17, 19, 26. 

 niagarensis, 19. 

 radiatus, 19. 

 sulcatus, 19. 



Stromatopora, 23, 24. 

 galtensis, 26. 



Stropheodonta profunda, 23, 24, 



Subretepora dichotoma, 19. 



Taconic revolution, 9. . 

 Tonawanda creek, 28. 

 Tonawanda swamp, 28. 

 Trematonotus alpheus, 26. 

 Trenton limestone, thickness, 8, 

 Trochoceras desplainense, 27. 



Ulrich, E. O., cited, 9. 

 Utica shale, thickness, 8. 



Vanuxem, Lardner, cited, 13, 

 Vernon shale, 8, 29, 30-31. 



Walther, J., cited, 25. 

 Whitfieldella nitida, 17, 19, 26. 

 Williamson shale, 8, 15-16. 

 Wolcott limestone, 8, 14-15. 



Zaphrentis cf. racinensis, 26. 



