52 C. D. WALCOTT — A DISPLACEMENT IN" THE GRAND CANON. 



In section 2 (fig. 2), which w;i> taken "><)(• yards north of section 1 (fig. 1), 

 at the north wall <>4' the valley, the Cambrian Tonto Bandstone and the 

 superjacent Cambrian limestone arch over the Hue of the Butte fault with- 



Vw st 



East 



^ 05 O.C. (a) U.T. R.W 



Fir.uRF. 3.— An East and West Section on the & : ' V ip Brook. 



Tlie section faces north fit a point opposite section 1 and south of the outcrop of lava besides the 

 brook. L.A. = Lower Aubrey sandstone. Other letters and scale as in section 1. 



out breaking, and the fault is limited to the pre-Cambrian movement that 

 displaced the Chuar and Grand Canon terranes of the Algonkian. The 

 latter movement is shown by the faults b and c, fig. 2. Whether a pre- 

 ( iambrian fault existed on the line of the fault a, fig. 1, is unknown, as the 

 debris covers the slope at the corresponding point in fig. 2. 



West 



Pious '• arguni 



The rise on the « '" \ Upper Aubrey limestone ; L \ 



an dn tone; R vv. Red Wall limes) me ' i Upper Tonto shaly lime 



. ['onto sandsto • I Chuar group shales; a, a Butte. fault Scale as in fig. 1. 



