134 GEOLOGICAL SUEVEY OF THE TERRITOEIES. 



tion 2, rises in a long spur, the red-beds mantling round its southern 

 end with a very low dip, while upon its western side small areas of the 

 red-beds still remiin, and, preserving an eastern dip, indicate a fault 

 separating them from the main ridge. 



Eeturning southward we find west of the ridge h the same series again 

 reclining at a gentle angle upon the next echelon ridge to the west, Ce 

 The hill c, section 4, is a very commanding point, rising some 2,000 feet 

 above the adjacent creeks. 



Its uniform eastern slope descends to the long ridge of red-beds which 

 runs uninterruptedly from Dry Creek to the Little Thompson, and dips 

 eastward at an angle not far from lOo. Ending as a ridge at the Little 

 Thompson, the next ridge of red-beds to the south is found between the 

 Little Thompson and Saint Vrain's Creeks, but offset some three miles 

 to the west with respect to the former ridge. 



In the Lower Little Thompson the ridge h does not exist as an anti- 

 clinal at all, though its effect maybe seen in the flatter dip of the beds. 

 Proceeding up the stream an excellent section of the rocks may be ob- 

 tained from Cretaceous No. 3 dov^nward to the Metamorphic rocks, the 

 gravel terraces concealing all east -of No. 3. (Section 6.) 



In passing through the ridge formed by No. 1, it is here seen to flatten 

 and swing around westward to the south, on through the red-beds, 

 which show a like tendency, when, at their base, a rugged outcrop of 

 archsean quartzite presents itself, on which the red-beds rests, and on 

 the west side of which their lower members are dragged abruptly down- 

 ward, followed by a space of contorted strata which is fairly represented 

 in section 6. The quartzite is the southern extremity of the long south- 

 east spur of the ridge c. Continuing southward from this point, and after 

 passing some of the contorted beds. No. 1 is found on either side gradu- 

 ally closing to the south, with a flat east dip and steep west dip, c, sec- 

 tion 7. The trio sides join farther on, the bed becoming continuous, but 

 again the area covered by No. 1 is broken open, and a small crescent- 

 shape patch of the underlying Jurassic is exposed on the summit of the 

 hill c, section 8, lying midway between the Little Tliompson and Saint 

 Vrain's Creeks. The steeper dip at this isofeted point is upon the east. 

 This is the last known indication southward of fold c. Taking it up 

 again at the Little Thompson, section C, and following it northward, we 

 find upon the east side of the schist ridge, c, the long sandstone ridge 

 before spoken of dipping gently east, while the red-beds upon the west 

 side of the sharp ridge, instead of being upturned upon it and dipping 

 west, are faulted sharply downward, abutting directly against it. As 

 the northern end of the valley rises, and erosion having removed the 

 beds at higher levels, the lower sedimentary rocks are found forming a 

 bay-like area southwest of the high hill c, section 4, faulted against the 

 schists at the east, and lying upon the schists on the west and north, 

 (section 5.) 



Passing north around the steep west base of the high hill c, an iso- 

 lated sandstone area of similar structure is found in Eattlesnake Park, 

 (section 3.) It would here seem as if the fault bent from a northwest to 

 a northeast course. Returning to the sandstone bay, west of ridge c, its 

 lower red- beds are found mantling around the south end of the lower 

 schist ridge d, lying west of hill c, with a south dip of about 40°, when, 

 turning southward, they form the high, western, most hog-back ridge 

 between the Little Thompson and North Saint Vrain's. East of this 

 ridge the same beds are folded into the rolling anticlinal d, section 7, 

 which a few miles south is only apparent by the flatness of No. 1 on the 

 south side of the Saint Vrain's, (sections 8 and 9, d.) The high promi- 



