856 



NORTH AMERICAN INDEX FOSSILS. 



Vermont quartzites — lower Cambric of 



northern Appalachians. 

 Verticil — several objects forming a 



circle around an axis, as of leaves 



about a stem at the same node. 

 Vesicle — a bladder-like vessel, a cell. 

 Vesicular — bearing vesicles or hollow 



cavities. 

 Vestibule — in Bryozoa, a tubular shaft 



at the bottom of which the zoecial 



aperture occurs. 

 Vickshurgian — general term for lower 



Oligocenic. 

 Vicksburg limestone — lower Oligocenic 



of Gulf coast. 

 Vincentown sands — upper Cretacic 



(Jerseyan) of Atlantic coast. 

 Viola limestone — upper Ordovicic of 



Oklahoma. 

 Virgula — in graptolites, the median 



axis or strengthening rod extending 



the entire length of a branch (see 



Fig. 50). 

 Viscera — the internal organs of the 



body. 

 Vitreous — glassy. 

 Volution — a spiral turn ; a whorl. 



Wabaunsee formation — Permo-Carbonic 



of Kansas. 

 Waccama formation — lower Pliocenic 



of Carolinas. 

 Waldron shale — Niagaran of Indiana 



and Tennessee. 

 Walnut clay — Fredericksburgian or 



middle Comanchic. 

 Wapanucka limestone — Arkansan (low- 

 er Carbonic) of Oklahoma. 

 Wappinger limestone — lower Cambric 



to lower Ordovicic of eastern New 



York. 

 Wapsipinicon limestone — middle De- 



vonic of Iowa. 

 Warsaw shales and limestones — upper 



division of Osage group, lower Mis- 



sissippic of Mississippi Valley. 

 Wasatch limestone — Mississippic of 



Wasatch Mountains. 

 Washita division — upper Comanchic, 



general term. 



Waukeshaw beds — Niagaran of Wis- 

 consin. 



Waverlyan, Waverly group — lower Mis- 

 sissippic of eastern North America. 



Waynesboro formation — middle Cam- 

 bric of Pennsylvania-Maryland. 



Waynesburg formation — upper Monon- 

 gahela of Ohio, Pennsylvania, etc. 



Wellington division — subdivision of the 

 Sumner, Kansas. 



Wenonah formation — middle Cretacic 

 of Atlantic coast. 



Weverton sandstone — lower Cambric of 

 Pennsylvania and Maryland. 



White Horse formation — Permic of 

 northern Texas. 



White Pine shale — Mississippic of 

 Nevada. 



White River beds — Oligocenic of South 

 Dakota. 



Whitewood limestone — upper Ordovicic 

 of Black Hills. 



Whorl — a single turn or volution of a 

 coiled shell. 



Wilbur limestone — upper Siluric of the 

 Helderberg Mountains. 



Wind River beds — lower to middle 

 Eocenic of Wyoming. 



Windsor limestone — Carbonic of Nova 

 Scotia. 



Wing — in pelecypods, the posterior and 

 larger expansion along the hinge line. 



Woodbury clay — middle Cretacic of At- 

 lantic coast. 



Woods Bluff beds — lower Eocenic of 

 Alabama. 



Woodstock formation — subdivision of 

 Pamunkey of Atlantic coast. 



Wreford formation — subdivision of the 

 Chase of Kansas. 



Wyoming formation — Triassic of the 

 Front Range region. 



Yellville limestone — upper Cambric and 

 lower Ordovicic of the Ozarks. 



York shale — lower Cambric of southern 

 Pennsylvania. 



Yule limestone — lower Ordovicic of 

 western Colorado. 



Zoarium — a colony of Bryozoa formed 



