160 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



the Eocene, which yield petroleum on distillation, in some cases giving larger 

 yields than the famous oil shales of Scotland. A study of the microscopic 

 structure of these shales, by means of methods developed in studying peat ami 

 fresh biological material, has developed the fact that they contain an extensive 

 flora of very minute alga? and other cryptogamic plants. Some of these plants 

 will be presented and discussed. (Lantern slides, 20 minutes.) 



There was then presented and discussed by Messrs. TJlrich and Weller 

 the following paper, which was illustrated by charts ; 20 minutes. 



FORMER EXTENSION OF THE DEVONIAN FORMATIONS IN SOUTHEASTERN 



MISSOURI 



BY STUART WELLEB 



(Abstract) 



The Devonian formations in Sainte Genevieve County, Missouri, are now 

 restricted in their distribution to a narrow zone of faulting that crosses the 

 county in a general east-west direction. It has been possible to differentiate 

 the faulting in this zone into two periods — one late Devonian in age and the 

 other post-Fennsylvani;m. During the earlier faulting the upthrow was all 

 on the north, and during the succeeding period of erosion and peneplanation 

 the entire mass of the Devonian and Silurian rocks extending northward from 

 the fault-line was removed. The later faults followed closely the direction 

 of those of earlier date, but in general lie a mile or less to the south of them. 

 The upthrow of the later faults is on the south, and with the succeeding 

 erosion and peneplanation the southern extension of the Silurian and Devonian 

 beds was cut away. The only Silurian and Devonian record, therefore, of 

 what was originally a succession of broadly extended seas is now preserved 

 in the narrow strip between the two lines of faults. 



The final paper of the program Avas read by the author and was dis- 

 cussed by Miss O'Connell and Messrs. Van Ingen, Kindle, Buedemann,, 

 Wilson, and Ulrich : 20 minutes. 



BOTTOM CONTROL OF THE COMPOSITION OF MARINE FAUNAS AS 

 ILLUSTRATED BY DREDGING IN THE BAY OF FUNDY 



BY E. M. KINDLE 



(Abstract) 



The results of collecting and dredging marine shells from the inter-tidal and 

 shallow-water zones at 10 stations on the west coast of Nova Scotia are pre- 

 sented in tabular form, each of 51 species of gasteropods and pelecypods being 

 checked in columns representing different stations and types of bottom. It is 

 shown that a very small proportion of the species are common to types of 

 bottom which, like black mud and gravel, exhibit sharp physical contrasts. 

 Types of bottom, however, which are similar or closely allied in physical 

 features have a very large percentage of species in common. 



