74 



WILLIAMS— DEEP KANSAN PONDINGS IN 



wango.^ The sheer walls of this cutting are shown along the rail- 

 road across the Allegheny from Glade. In this canyon were dropped 

 some of the deposits described below, and others were dropped after 

 the greater clearance of the glacier from the valley. Williams^ has 

 called these the Early, the Middle, and the Late Big Bend Gravels 

 of the Late Fhiviatile Period, as all the prominent deposits along 

 the Allegheny Valley are associated with ponding, and with deposi- 

 tion by currents passing through stagnant water. 



All of these deposits show foreset bedding dipping towards 

 Thompson, and the earliest is the high, long, and narrow bar stand- 

 ing out into the level plain, on which Oakland Cemetery is situated, 

 south of Warren and of the Allegheny River. This is similar in 



b.i'-£^StL:ii'^^:^^i 



Fig. 13. Western end of South Warren terrace-bar, showing shaping before 



deposition of Leverett clay. 



appearance and origin to the bars in front of the gaps in Bald Eagle 

 Mountain (cf. Fig. 2). It is capped with iceberg clay, and its top 

 has the elevation of the Upper Indian Hollow Sands, 1,322 feet. 

 The old gravels in its composition are the Clarendon Gravels swept 

 from the valley of Brown's Run, from the area where the Cone- 

 wango channel was crossed by the torrent, and from that channel 



