TITLES OF PAPERS 67l 



Then was read by title 



HISTORICAL NOTES ON EARLY STATE SURVEYS 

 BY GEOEGE P. MERRILL 



The next paper read was 



IRON ORES OF MARYLAND 

 BY JOSEPH T. SINGEWALD, JR 1 



[Abstract] 



This paper presents a brief summary of the results of an investigation car- 

 ried on during the past season on the iron ores of Maryland under the auspices 

 of the Maryland Geological Survey. Four classes of ore were recognized — 

 limonite, hematite, magnetite, and siderite. The paper presented embraced a 

 discussion of the character and chemical composition of each of these ores, the 

 localities in which the deposits occur, and also their geologic and stratigraphic 

 relations. 



After this was presented orally 



SHORTAGE OF COAL IN THE NORTHERN APPALACHIAN COAL FIELD 

 BY I. C. WHITE 



This paper has been published as pages 333-340 of this volume. 

 The next paper was read by title. 



GLACIAL CHARACTER OF THE YOSEMITE VALLEY 

 BY FRANCOIS MATTHES J 



Then was presented orally 



THE MILLS MORAINE WITH SOME DISCUSSION OF THE GLACIAL DRAINAGE 

 OF THE LONGS PEAK (COLORADO) DISTRICT 



BY EDWARD ORTON, JR 2 



This paper was discussed by W. T. Lee. 

 The next paper read was 



QUARTZ AS A GEOLOGIC THERMOMETER 

 BY FRED E. WRIGHT AND E. S. LARSEN 



[Abstract] 



Observations by Le Chatelier and Mallard in 1889-1890 proved that at about 

 570 degrees quartz crystals undergo a reversible change, the expansion-coeffi- 



1 Introduced by Wm. Bullock Clark. 



2 Introduced by F. P. Gulliver. 



LXIII — Bull. Geol. Soc. Am., Vol. 20, 1908 



