ON A PECULIAR CLEAVAGE STRUCTURE RESEMBLING 

 STRETCHED PEBBLES, NEAR ELLIJAY, GEORGIA^ 



W. C. PHALEN' 



INTRODUCTION 



The subject of elongated or stretched pebbles has been treated in 

 two articles by Mr. S. W. McCallie, state geologist of Georgia. - 

 Both of the occurrences described are in Georgia, one of them, the 

 first cited in the references below, being located in the vicinity of 

 Ellijay, Gilmer County, about 75 miles north of Atlanta; the other 

 2^ miles southeast of Dahlonega, the county seat of Lumpkin County. 

 Mr. McCallie's paper on the Ellijay occurrence may be summarized 

 briefly as follows : 



The stretched pebbles are chiefly confined to a belt less than one- 

 half mile wide and about 15 miles long just west of the Louisville- 

 Nashville Railroad and near the western margin of the crystalline 

 rocks of the state. The beds containing the pebbles are in some places 

 numerous. They vary from iMo 5 feet in thickness, and are always 

 interbedded in mica schist. The pebbles in the different beds 

 differ both in size and in degree of elongation. They are mainly found 

 in a matrix of mica which, however, may be absent or nearly so, 

 in which case the quartz pebbles may be welded together, requiring 

 slight pressure to force them apart. Both quartz and feldspar 

 pebbles are found, the former being the more numerous; the former 

 also are greatly elongated while the feldspar pebbles retain more or 

 less perfectly their original rounded shapes. The size, shape, color, 

 and texture of the pebbles are next described, and the article closes 

 with a description of thin sections of the pebbles. The title of Mr. 

 McCallie's paper, '^ Stretched Pebbles from Ocoee Conglomerate," 

 will serve to summarize sufficiently well his idea of the origin of the 

 phenomenon. 



1 Published with the permission of the Director of the U.S. Geological Survey. 



2 Jour. 0} Geology, XIV (1906), 55-59; ibid., XV (1907), 474-78. 



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