40 PROCEEDINGS OF THE PRINCETON MEETING 



the Cambrian quartzite. The conclusion is reached that these older sediments, 

 bounded above and below by conglomerates and unconformities, are properly 

 classed as Algonkian. 



Presented in full without notes. The paper was discussed by Dr. C. D. 

 Walcott. 



RECONNAISSANCE OF THE ALGONKIAN ROCKS OF SOUTHEAST 

 NEWFO UNDLAND 



BY ARTHUR F. BUDDINGTON ^ 



{Abstract) 



The Algonkian rocks of southeast Newfoundland consist, first, of a thick 

 series of sediments at least 16,000 feet thick; and, second, of a complex of 

 igneous rocks comprising intrusive bosses of granite, syenite, and gabbro, in- 

 numerable dikes of basic and acid porphyries, and several lava flows, both 

 basic and acid. The latter are accompanied by equivalent tuffs and agglom- 

 erates, and although completely devitrified and more or less sheared, yet are 

 preserved in a remarkably fresh condition. The acid lavas show beautiful 

 spherulitic, lithophysal, flow breccia,' fluxion, and ellipsoidal structures. The 

 basic lavas, probably of submarine origin, show a characteristic development 

 of pillow lavas, as well as amygdaloidal and possible variolitic structures. 

 Volcanic necks filled with agglomerate are indicated at one or two'-^ T.p **•' -. 



The sedimentary series is made up for a large part of more or less water- 

 worn volcanic material ana eo^isists of green and purple cherty slate, volcanic 

 conglomerate, purple argillite, and an upper series, 6,000 to 7,000 feet thick, 

 of red and green sandstones, conglomerates, and shales, which in their pre- 

 dominating red color, fresh feldspars, cross-bedding, and intraformational con- 

 glomerates show evidence of a continental origin. 



Eead in full from manuscript. The paper was discussed by Mr. Arthur 

 Keith. 



SECTIONS ILLUSTRATING THE LOWER PART OF THE SILURIAN SYSTEM OF 

 SOUTHWESTERN ONTARIO 



BY MERTON Y. WILLIAMS * 



(Al)stra€t) 



The subject-matter of this article is based on detailed field work done during 

 the past summer for the Geological Survey of Canada and extending along 

 the Niagara escarpment from Niagara Falls to the end of the Bruce Peninsula. 

 Twenty-three important sections were measured. 



The conclusions are as follows : The Medina sandstones of Niagara gorge 

 (125 feet thick) are represented farther north by dolomite and shales (cata- 

 ract formation). The members of the Qinton formation, along with the 



"^ Introduced by Gilbert van Ingen. 

 * Introduced by E. M. Kindle. 



