122 PROCEEDINGS OP THE WASHINGTON MEETING 



the red beds to the east, have yielded marine fossils. These fossils are now 

 being studied in the Taleontological Laboratories at Columbia University. 

 This fauna substantiates the previously recognized Pennsylvania age of these 

 limestones. In the Red Mountain region, near the Wyoming-Colorado bound- 

 ary line, a thin red conglomerate was noted 177 feet below the base of the 

 overlying Morrison shale. This conglomerate contains numerous bone frag- 

 ments, mostly of a water-worn nature ; but after a two-day search the writer 

 was rewarded by the finding of a complete limb bone, the nature of which is 

 yet undetermined. It is anticipated that this horizon, which was recognized 

 in two sections 30 miles apart, will yield better material when thoroughly 

 examined. 



Presented by title in the absence of the author. 



EXPERIMENT IN THE GRAPHIC PRESENTATION OF THE ECONOMIC GEOLOGY 



OF BEDDED DEPOSITS 



BY GEORGE H. ASHLEY 



(Abstract) 



Aii attempt to present, by means of charts and maps, all of the known data 

 concerning the resources of an area, so that, without the text, which in the 

 main is confined to an explanation of the charts and maps, the reader may 

 determine for himself the position on or under the surface, probable thickness, 

 etcetera, of any and all beds of coal, clay, limestone, iron, etcetera, at any 

 point in the area, so far as the data on hand warrant any conclusions. 



Presented in abstract extemporaneously. 



BRECCIATION EFFECTS IN THE SAINT LOUIS LIMESTONE 

 BY FRANCIS M. VAN TUYL T 



(Abstract) 



The Saint Louis limestone, as developed in southeastern Iowa and adjacent 

 parts of Illinois and Missouri, is frequently so badly brecciated and disturbed 

 that all semblance of the original structure is lost. The character and cause 

 of this disturbance has until the present never been fully investigated, although 

 it has been commented on by nearly all geologists who have examined the 

 formation even casually. 



Recent study of the Saint Louis has made necessary considerable revision 

 of the formation as defined in previous reports. It is now known that the 

 arenaceo-magnesian limestone sometimes shown at its base and formerly in- 

 eluded with it is a distinct formation of the horizon of the Spergen limestone. 

 This has been shown to be both physically and faunally distinct and to be 

 separated from the true Saint Louis by a disconformity. 



Moreover, the Pella member, which was formerly regarded as the topmost 

 subdivision of the Saint Louis, is also formationally distinct. This bears a 

 good Sainte Genevieve fauna and is separated from the true Saint Louis be- 



1 Introduced by T. E. Savage. 



