534 GEOLOGY OF THE YELLOWSTONE NATIONAL PARK. 



Formation and locality : Madison limestone, Limestone bluff north of 

 Little Sunlight Creek, Absaroka Range, 600 feet above the stream ; Arnold 

 Haffue. Divide between Gallatin River and Panther Creek, Gallatin 

 Range; W. H. Weed. Crowfoot Ridge, Gallatin Range, bed 25, bed 26, 

 lower part of bed 27, upper part of bed 27 ; J. P. Iddings and W. H. 

 Weed. South of Forellen Peak, Teton Range ; S. L. Penfield. Head of 

 Conant Creek, Teton Range ; W. H. Weed. 



Productus LiEvicosTA White. 

 PI. LXIX, figs. 9a, %, 9c. 



Prodnctm Icevicostus White, 1860: Jour. Boston Soc. Nat. Hist,, Yol. VII, p. 230. 

 ( ?) Hall and Whitfield, 1877 : King's D". S. Geol. Expl. 40th Par., Yol. IV, p. 266, 

 PI. V, figs. 7, S. Keyes, 1895: Geol. Surv. Missouri, Vol. V, Pt. II, p. 41, PI. 

 XXXVIII, fig. 1. 



This is the type identified by Hall and Whitfield as P. Icevicosta and 

 figured by them in King's U. S. Geol. Expl. 40th Par., Vol. IV, PI. V, figs. 

 7, 8. The figure there given is somewhat restored, and in view of new 

 material, which unquestionably belongs to the same species, appears to be 

 only partially correct, The broken portion consists of the ears, which, 

 instead of being small and inconspicuous, are rather large, marked by the 

 same fine striae which traverse the body of the shell, and in addition by 

 strong longitudinal wrinkles, together with, in some cases, numerous spine 

 bases. 



This is one of the most common species in the Yellowstone National 

 Park and in some localities is found in great abundance. As there repre- 

 sented it appears to answer White's description in every detail. 



Formation and locality: Madison limestone, White Mountains, Absa- 

 roka Range, just below the Quadrant quartzite; T. A. Jaggar. East side 

 of Gallatin River, west of Electric Peak; divide between Gallatin River 

 and Panther Creek, Gallatin Range; W. H. Weed. Crowfoot Ridge, Gal- 

 latin Range, top of bed 5; J. P. Iddings and G. M. Wright. Same, top 

 of bed 26, lower part of bed 27, bed 31; J. P. Iddings and W. H. Weed. 

 East slope of Survey Peak, Teton Range; S. L. Penfield. Summit of 

 peak west of Antler Peak, Gallatin Range; south slope of same; J. P. 

 Iddings. North of Bighorn Pass, Gallatin Range; A. C. Gill. Head of 

 Conant Creek, Teton Range; W. H. Weed. Kinderhook age, Burlington, 

 Iowa; Louisiana, Missouri; Oquirrh Mountains, Utah. 



