VOL 19, 1907. PL 3 



Fig. 3. F/for/Ls: or r/^c r^Li. at lake srFiECT 



Ji^fiS^MPioa 



Fig. 2. Prpor/LE or THE east eall 



FALL-eCAHF 



LIMESTONE 1 



too FC£T 



SANDSTONE 





Forts nailing FiG. 1. SECT/O/V of the: GORGE ^r roE?r JS/VELL/A/G, f^om gofi/NGs made 



L ' IMB^TOJ ' ^IEI i""^^ L/nc/er Me (//reef /on of Co/. ^/lAf£S B.^u/AM, Corps of fny/neers, (/.S.A. 



/^ e.^/.DUSA//, Potior enyiieer 



SAINT •PETE:R .; '• 



■ SANDSTON£' 



sc/ii-e:; 

 M/SS/SS/P/^"/ /R/^Ef( 



■•: .■•.'■■xf-<^ANn .':^GRAyEj.- • .an.d, '.■■-i.i.m-e.stone. -.blocks^- ..• ■^. 



SHAKOPEET!TDrbivirhr± dr^ t 



SECTIONS AT FORT SNELLING 

 KiKiirc 1 Is (1 s.vlluii iiim,- ll..- MtH«l«rtIi'l'l I'lvr wiw Mm- ni..iilh of Siiliil .\mli..iiy gui-gc ; ll«ure 2 Is a i>n»lll<' ..f tli.> !iiH-l.>n( fall Hi iiillos iibov.^ V<^^■\ Sm-llinj,': ll,L:un- :i Is a |)roQle of llm !im;ipnl fall 4 miles iibuTC Koft Snelllng 



