TREXTON LIMESTONE. 



299 



a half mile northwest of this point, at Smith's quarry, the junction of the Upper Blue 

 beds and the Galena limestone with a few feet above and below is shown, completing 

 the series. This junction may also be seen between Turtleville and Shopiere. 



The quarries at Rockton, Illinois, present a magnificent section of the Upper Buff beds 

 from layer B. IV upwards to the lower portion of the Upper Blue beds . 



These statements are given thus specifically that there may be the fullest opportunity 

 for verifying and utilizing the statements of this report, and that there may hereby be 

 furnished a basis for the more accurate study of the vertical, and, to some extent, hori- 

 zontal range of the exceedingly interesting fossils of these beds, which it is hoped will 

 be prosecuted by the geologists of the region. A series of collections carried on for years 

 under the favorable opportunities afforded by continuous quarrying, in which the exact 

 locality and horizon should be carefully noted, could not fail to show valuable results. 



Over one hundred species of fossils are known to occur in these beds, among which the 

 following identifications have been made : 



Buthotrephis succulens. 

 Steptelasma corniculuni. 

 Cha3tetes lycoperdon. 

 Cha^tetes discoideus. 

 Stictopora elegantula. 

 Stictopora, n. sp. 

 Schizocrinus nodosus. 

 Ptilodictya recta. 

 Lingula, sp. und. 

 Orthis perveta. 

 Orthis plicatella. 

 Orthis testudinaria. 

 Orthis pectinella. 

 Orthis tricenaria. 

 Orthis bellarugosa. 

 Strophomena camerata. 

 Strophomena alternata. 

 Strophodonta, sp. und. 

 Streptorhynchus deflectum. 

 Streptorhynchus subtentum. 

 Leptsena sericea. 

 Rhynchonella, sp. und. 

 Ambonychia attenuata. 

 Ambonychia, n. sp. 

 Ambonychia lamellosa. 

 Cypricardites Niota. 

 Cypricardites rotundatus. 

 Cypricardites ventricosus. 

 Cypricardites, n. sp. 

 Tellinomya nasuta. 

 Tellinomya alta. 

 Tellinomya Iphigenia. 

 Tellinomya levata. 

 Tellinomya ventricosa. 

 Modiolopsis superba. 

 Modiolopsis plana. 

 Raphistoma lenticularis. 



Raphistoma Nasoni. 



Trochonema ambiguuin. 



Trochonema umbilicatum. 

 j^R-ochonema Beloitense, n. sp. 



Plurotomaria subconica. 



Murchisonia bicincta. 



Murchisonia gracilis. 



Murchisonia helicteres. 



Murchisonia pagoda. 



Murchisonia tricarinata. 



Cyclonema percarinatum. 



Subulites elongatus. 

 j/Clisospira occiclentalis, n. sp. 



IMicotoinu planulata. 



Maclurea Bigsbyi. 

 ,/Metoptoma perovalis, n. sp. 



"elltTophon bilobatus. 

 ellerophon Wisconsinensis, n. sp. 

 jucama JbueDi, n. sp. 



Bucania punctifrons. 



Bucania bidorsata. 



Pterotheca attenuata. 



Baconi, n. sp. - 



Gyroceras, sp. und. 

 ,yrtoceras annulatum. 



Cyrtoceras corniculum. 



Cyrtoceras eugium. 



Cyrtoceras Neleus. 



Oncoceras abr upturn. 



Oncoceras Alceus. 



Oncoceras Lycus. 



Oncoceras Pandion. 



Oncoceras plebeium. 



Oncoceras, sp. undescribed. 



Oncoceras, sp. undescribed. 



Orthoceras anellum. 

 ^jQrthoceras nlulticameratum. 



