INDEX TO LOWER SILURIC SHALES OT MOHAWK VALLEY 



Sphenothallus, 73 



angustifolius, 26, 73, 74 



latifolius, 73 

 Sponge spicules, 23 

 Sprakers, 14, 20, 25 

 Spyroceras bilineatum, 42, 49, 50, 62 

 Starch Factory creek, 15, 27, 35 

 Steels creek, 34 

 Stictopora sp., 20 

 Stictoporella cf. angularis, 21, 22 



exigua, 21, 22 

 Stomatotrypa ? sp., 21 

 Stose, George W., cited, 72, 13 

 Stiirtz, B., cited, 70 

 Stylonurus? limbatus, 42, 45, 49 

 Swartztown creek, 15, 19 



Taeniaster cylindricus, 89 



elegans, 89 



schohariae, 46, 49, 50, 88-90 



spinosus, 89 

 Taeniura, 89 

 Technophorus, 123 



cancellatus, 60, 62, 64, 122-23 



punctostriatus, 123 

 Tellinomya levata, 20 



nuculiformis, 21 

 Tentaculite limestone, 53 

 Tentaculites cf. flexuosa, 51 

 Thysanograptus eucharis, see Lasio- 



graptus (Thysanograptus) eu- 

 charis 



Trematis terminalis, 33, 63 

 Trenton limestone, 6, 12, 13, 14, 15, 



16, 20, 21, 22, 29, 58, 69; decrease 



of thickness eastward, n; use of 



term, 10 

 Trenton limestone, basal, 34. See 



also Glens Falls limestone 

 Triarthrus becki, 7, 8, 9, 10, 17, 21, 



24, 26, 27, 28, 32, 33, 35, 36, 42, 



43, 49, 50, 52, 62 



Tribes Hill (fucoidal) limestone, 20 

 Trinucleus bellulus, 51, 52 



concentricus, 8, 10, 16, 20, 22, 33, 



34, 35, 42, 43, 49, 5O, 51, 60, 62 



Trocholites ammonius, 7, 21, 26, 27, 



33, 34, 42, 49, 52 

 Troy, 58 

 Turrilepas filosus, 23, 62 



Ulrich, E. O., acknowledgments to, 

 6; cited, 70, 71, 72, 73, H, 13, M, 

 21, 26, 37, 38, 51, 52, 56, 58, 65, 69, 

 77, 84, 86, 95, 96, 97, 98, 100, 101, 

 104, 105, 106, 107, 109, 1 10, 119, 



I2O, 121, 122, 123 



Ulrichia? bivertex, 22, 25, 64, 120-21 



Utica, 10, 27 



Utica shale, 6, 9, n, 12, 38, 47, 58, 

 67, 69; characteristic fauna of the 

 base of, 28; disappears entirely as 

 it approaches the Hudson valley, 

 66; entirely absent in the lower 

 Mohawk region, 29; historical 

 sketch, 7-15; not represented in 

 the Hudson river region, 30; 

 thickness, 9, 10, 13; use of term, 

 10 



" Utica shale " of the lower Mohawk 

 valley, 5, 11, 14, i5~34 



Vanuxem, Lardner, cited, 69, 7, 8, 



9, 15 



Vly, 47, 48 

 Voorheesville, 30, 47 



Waagen, cited, 123 



Walcott, C. D., cited, 70, 9, 51 



Waterford, 12 



Watervliet, 63 



Weller, Stuart, cited, 72, 116 



White, David, acknowledgments to, 



6; referred to, 73 

 White, T. G., cited, 71, 10 

 Whiteavesia sp., 23 



cancellata, 96 



cincinnatiensis, 95, 107 



cincta, 60, 62, 95, 96 



cumingsi, 60, 62, 96 



saffordi, 96 



subcarinata, 95, 96 

 Whitella compressa, 98 



elongata, 60, 62, 98 



ohioensis, 98 



Whitfield, R. P., cited, 70, 71, 8, 118 

 Winchell, N. H., cited, 71, 94, 95 

 Wood, E. M. R., cited, 72, 80 



Zygospira recurvirostris, 20, 60, 61, 

 64 



