334 



The Ohio Journal of Science [Vol. XX, No. 8, 



SIMILARITY TO THE " ROCK STREAMS" OF COLORADO. 



Our difficulties in interpreting this feature were evidently 

 very similar to the experience of Cross and Howe, who first 

 described the "Rock Streams" of Colorado which closel}'- 

 resemble the present terrane, for in their first account of them* 

 they say: "Probably masses of the same character occur in 

 many other localities, but they are less sharply defined from 

 other debris and hence, so far as we can ascertain, they have 

 never attracted sufficient attention to be particularly described. 



Photograph by D. B. Church 



ONE OF THE LARGEST OF THE ROCK PILES. 



The man against the sky line gives the scale. In this case the pile departs some- 

 what from the conical shape, but was evidently formed in 

 the same manner as the more perfect cones. 



The most striking of these masses, and those to which attention 

 was first directed, closely resemble debris covered glaciers at 

 the heads of the basins or cirques in which they occur. * * * 

 All the accumulations just described impress one with a sense 

 of motion, looking as if they had flowed as do viscous masses and 

 were still advancing from the head walls of the cirques down- 

 ward. So noticeable was this that in the fiald they were spoken 

 of as "Rock Glaciers," and upon the map receive the name of 

 " Rock Streams. " * * * The larger rock streams, however, 



*Silverton Folio. (U. S. Geol. Survey Folio 120, p. 25), 1905. 



