THE HART MOUNTAIN OVERTHRUST 55 
tute parts of one major thrust, carved into isolated portions by 
erosion. As they suggest, however, such correlation awaits further 
and more careful study, particularly as to the dating of the faults. 
To the information they have gathered may be added the more 
recent work of Haynes* on the “Lombard Overthrust” in Mon- 
tana. 
The present paper is presented as a further contribution to the 
subject, and, while conclusions as to correlation are still premature, 
the writer believes it to be quite improbable that these various 
faults will ultimately be found to be a part of one great over- 
thrust. It seems much more likely that they represent numerous 
‘“‘Decken”’ or rock sheets, the one driven over the edge of the 
next after the manner described by Geikie? in discussions of Alp ne 
structure. Two such rock sheets, one above the other, are exposed 
along the South Fork of Shoshone River, in the area here described. 
t Jour. Geol., XXIV (1916), 269. 
2 Geikie, Mountains, Their Origin, Growth, and Decay. 
