GLOSSARY. 



837 



shells in which, as in Nautilus, the 

 later whorls partially or completely 

 hide the preceding. 



lola limestone — middle Carbonic of 

 Kansas. 



Irregular — not regular. Applied to echi- 

 noids in which the mouth is either 

 central or eccentric and the anus is 

 eccentric; exocyclic (see Fig. 1928, 

 1933). 



Ischiopodite — see II., 388. 



Isodont dentition — in pelecypods, see I., 

 361. 



Izard limestone — upper Ordovicic of 

 Arkansas. 



ites — a Greek adjective suffix, meaning 

 like, or indicating origin or relation- 

 ship with. Much used in form ites 

 for fossils and ite for minerals, often 

 with no particular significance. 



Ithaca beds — local division of the Por- 

 tage in New York. 



Jacalitos formation — upper Miocenic of 

 California. 



Jacksonian, Jackson limestone — upper 

 Eocenic of Gulf coast. 



Jakutic division — subdivision of the 

 Scythic or lower marine Triassic. 



Jefferson City limestone — Ordovicic of 

 Ozark region. 



Jeffersonville limestone — middle De- 

 vonic of southern Indiana, etc. 



Jerseyan — the upper Cretacic of the At- 

 lantic coast. 



Joachim limestone — middle Ordovicic 

 of the Ozark region. 



Johannian division — a lithologic divi- 

 sion, including part of the middle and 

 part of the upper Cambric of the At- 

 lantic coast. 



John Day bed — Oligocenic of Oregon. 



Joint — in crinoids, an individual seg- 

 ment of the stem. 



Jordan coal — basal Coal Measures 

 (middle Carbonic) of Missouri. 



Jordan sandstone — subdivision of the 

 St. Croix formation. 



Judith River beds — middle Cretacic of 



Canada and Northwestern United 

 States. 



Jugum — in brachiopods, the yoke-like 

 calcareous ribbon, directly uniting the 

 two branches of the brachidia (see 

 Fig. 385, e). 



Juniata beds — upper Ordovicic of cen- 

 tral Appalachians. 



i^anawha series — lower Carbonic of Ap- 

 palachians. 



Karnic division — subdivision of the 

 upper marine Triassic. 



Kaskaskia limestone — upper Mississip- 

 pic of Mississippi Valley. 



Katemcy series — upper Cambric of 

 Texas. 



Keel — a strong central carina or ridge ; 

 in cephalopods, see II., 24. 



Keokuk limestone — middle division of 

 Osage group, lower Mississippic of 

 Mississippi Valley. 



Kiamitia clay — basal Washita (upper 

 Comanchic) of Oklahoma-Texas. 



Kimeridgian — division of the marine 

 upper Jurassic. (Kimtneridgian.) 



Kimmswick limestone — lower Kinder- 

 hook of Missouri. 



Kinderhook group — lower division of 

 lower Mississippic of Mississippi 

 Valley. 



Kiowa shale — upper Comanchic (basal 

 Washita) of Kansas, etc. 



Kittanning sandstones, shales, lime- 

 stones and coals — middle Carbonic 

 (Alleghenian) of Pennsylvania, Ohio, 

 etc. 



Kittatinny limestone — lower Cambric 

 to lower Ordovicic of New Jersey. 



Knobstone group — lower Mississippic of 

 Indiana and Kentucky. 



Knox dolomite — upper Cambric to 

 lower Ordovicic of southern Appa- 

 lachians. 



Knoxville group — lower Comanchic 

 (Shastan) of California. 



Kootenay formation — non-marine Co- 

 manchic of Canada. 



