592 



NEW YORK STATE MUSEUM 



•Olyptograptus amplexicaulis, 535'. 

 "Ooniophora carinata, 520^ 521*. 

 Oraptolites, pseudo-planktonic ani- 

 mals, 563^ 

 ■Graptolithus amplexicaulis, 496^ 



bicornis, 496^ 



mucronatus, 503*. 



pristis, 496^ 503^ 



ramosus, 496^ 



serratulus, 496^ 506*. 

 •Green Island, east shore of, 526^-27'; 



north shore of, 524^-26-. 

 Greenbush, 543\ 

 Gurley, R. R., cited, 583^ 489«, 497*, 



511^ 514^ 528', 534^, 547». 

 Guyot, Arnold, cited, 582^ 553^ 



3£all, James, cited, 58r, 58r, 582S 

 582^ 489', 490«, 493^-96*, 500^, 508', 

 514% 521^ 525^ 528«, 534*, 536*, 

 536% 545% 553% 564*, 577^, 580% 



iHelderberg mountains, outcrops of 

 Lorraine beds, 518% 



Heterocrinus heterodactylus, 516^ 



Hormotoma cf. gracilis, 529^. 



Hovey, F. O., cited, 584*. 



Hudson river beds, history, 490®- 

 512«; fossils, 490^-91% 493% 502% 

 504^-5*, 549^ correlated with Lor- 

 raine beds, 491^ correlated with 

 Frankfort slates, 492% 495"; cor- 

 relation with Point Levis sihales, 

 494^; primordial (Quebec) age of, 

 494^; composite character, 496^; 

 t)reak between Hudson valley re- 

 :gion and Mohawk valley, 504^; 

 evidence of Trenton age, 505^; cor- 

 Telation with Trenton limestone, 

 512°; resting on lower Trenton 

 limestone beds, 549^; Ti-enton fos- 

 sils in, 549^; four zones, 550^-51^, 

 558^, 567^; explanation of overturn 

 of strata, 552*-58^; thickness, 560''; 

 in the Mohawk valley, 565-; sum- 

 mary of paper, 567'-68*. 



Hudson river group, use of term, 

 491% 492% 492% 493% 493^-94^; 



term dropped by Hall, 494'; dis- 

 cussion of validity of term, 564*- 

 67"; term should be dropped, SGG*, 

 568% 



Hudson river shales, use of term, 

 492% 508% 566"; proposed to drop 

 term, 568». 



Hudson river slate group, term, 

 490% 



Hyolithes sp. ?, 502'.' 

 americanus, 502^. 



niaenus crasslcaud-a, 501*, 501'. 

 Indian Ladder, Lorraine beds, 518*. 

 Isotelus gigas, 525'. 

 cf. gigas, 545^ 



James, J. T., cited 525^, 534% 562». 



KerLWOiod, 543% 



Kimball, J. P., cited, 583', 560«. 



Lansing"burg, north end of, 541'- 



42«; bluff above, 542% 

 Lapworth, Charles, cited, 583\ 584*i 

 489% 497*, 505^-6«, 522% 528^ 547\ 

 562«, 563% 567% 

 Lasiograptus mucronatus, 544*. 

 Laveny's point, Waterford, 523^ 

 Lavery's quarry, 535^ 

 Lepidocoleus jamesi, 516', 52r, 526% 

 526^ 535'; description, 577"; ex- 

 planation of plate, 587*. 

 Leptaena rugosa, 525". 



sericea, 499^, 500^, 500*-l% 501», 



502% 508% 505% 

 subtenta, 502% 525^ 

 Leptobolus insignis, 515% 520*, 521*, 

 524% 5'24% 529% 530*, 531% 570». 

 walcotti, 541% 569^-70^; explana- 

 tion of -plate, 585% > 

 Leptograptus subtenuis, 539^, 543^. 

 Lingula curta, 503% 515% 520*, 521% 

 Lingulops, 569*. 

 Lophospira bicincta, 526% 



uniangulata var. abbreviata, 

 525% 526% 



