96 PEOCEEDINGS OF THE BALTIMORE MEETING 



In Georgia and South Carolina there are abundant deposits of white sedi- 

 mentary clays of Cretaceous age of value to the pottery, paper, and paint in- 

 dustries. 



In Florida the white sedimentary Tertiary clays, so valuable in the white- 

 ware industry, contain abundant reserves. 



The States of Mississippi, Tennessee, Kentucky, and Illinois are supplying 

 large quantities of refractory band clays from the Wilcox formation, which 

 are specially interesting because they can replace much of the clay for graphite 

 crucibles and glass pots, formerlj^ obtained from Germany. 



Presented in abstract from notes. 



OCCURRENCE AND ORIGIN OF WHITE CLAYS AT SAYLORSBURC, MONROE 

 COUNTY, PENNSYLVANIA i 



BY FREDERICK B. PECK 



(Ahstract) 



The clay occurs below an arch in the coarse Oriskany sandstone, which arch 

 runs northeast-southwest along the north side of Chestnut and Cherry ridges, 

 in Monroe County, Pennsylvania. The anticline pitches to the southwest. To 

 the northeast the sandstone roof has been removed. To the southwest it is 

 more or less intact. 



The clay has resulted from local alteration of calcareous shales (Stormville 

 series) and clayey limestones (Bossardsville limestone) beneath the Oriskany 

 arch. Before removal the arch, with impervious beds above, acted as a re- 

 ceiver under which the CO2 gas, resulting from the decomposition of the lime- 

 stone, accumulated under pressure, hastening and thoroughly completing the 

 decomposition of the shales and limestones. Prospects to the southwest, where 

 the roof of the arch is more or less intact, encounter CO2 gas. In one case it 

 escaped so rapidly and in such quantities as to drive the workmen from the 

 opening. The sound of the escaping gas was distinctly audible and resembled 

 the escape of air from the valve of an automobile tire. Numerous fossils of 

 Helderberg age are found in the clays. 



All of the important occurrences of the white clay are along the course of 

 an ancient drainage system, remnants of which are seen in the Wind Gap, 

 south of Saylorsburg, and in the low points in Chestnut and Cherry ridges at 

 Saylorsburg and east of Mount Eaton. 



Presented by title in the absence of the author. 



OIL GEOLOGY IN RELATION TO VALUATION 

 BY RALPH ARNOLD 



{AhstrarCt) 



A summary of results obtained and conclusions reached in the course of 

 investigations undertaken for the United States Department of the Treasury. 



Presented bv title in the absence of the author. 



1 Presented with permission of the State Geologist. 



