TITLES AND ABSTRACTS OF PAPERS 41 



Rochester shale, scarcely extend beyond the Niagara Peninsula, the Wolcott 

 limestone alone being seen at a locality of 25 miles northeast of Hamilton. 

 The Lockport dolomite rests from northeast to southeast successively on 

 Medina (cataract), Clinton and Rochester formations being thickest in the 

 north. Typical guelph fossils, including Megalomus canadensis, were found 

 on the northwestern portion of the Bruce Peninsula. 



Read in full from majiiiscript. The paper was discussed by Messrs. 

 E. 0. XJlrich, A. W. Grabau, and John M. Clarke. 



EVIDENCE OF CLIMATIC OSCILLATIONS IN THE PERMO-CARBONIFEROUS 



BEDS OF TEXAS 



BY E. C. CASE 



(Al)stract) 



This paper described the general series of deposits in the Wichita and Clear 

 Fork formations of north central Texas and attempts to show how a few of 

 the most persistent of the beds show evidence of a local change in climate. 

 The change in climate is correlated with the invasion of the region by a sea 

 from the south. The evidence from the nature of the deposits is supported by 

 the occurrence of plant and vertebrate fossils. 



^»j^j^„ in full from manuscript. The paper was discussed by Prof. 

 A. W. Grabau. 



GEOLOGIC HISTORY OF THE FLORIDA CORAL-REEF TRACT AND COMPARISONS 

 WITH OTHER CORAL-REEF AREAS 



BY THOMAS WAYLAND VAUGHAN 



(Abstract) 



The geologic formations of the southern end of the mainland of Florida and 

 of the Florida Keys were briefly characterized, and it was shown that in Pleis- 

 tocene time chemical deposition which resulted in the formation of oolite was 

 about one hundred times as effective in the formation of limestone as coral 

 reefs. The ratio of the constructional work of chemical deposition in Pleisto- 

 cene time in Andros Island, Bahamas, to that of the living barrier reef off the 

 east side of that island was stated to be several thousand to one. 



The living barrier reef of Florida occurs within the 10-fathom curve on a 

 platform the geographic limits of which exceed those of the reef, thus showing 

 that the reef is superimposed on a platform built by other than reef agencies. 



As several students of coral reefs have attributed the formation of atolls 

 to submarine solution by virtue of the carbon dioxide content of flowing sea- 

 water, this subject was studied from four standpoints, and the conclusion 

 deflnitely reached that submarine solution has not been instrumental in the 

 formation of the bays, sounds, and lagoons of the Florida coral-reef tract. 

 The atoll rims of both the Tortugas and Marquesas have been shaped by winds 

 and currents. 



