W. H. I'KATl'. SEC'IIOX OF SIXTH STliKKT HI.l'KK. }27 



ct-ssiblc- no results of a satisfactorv natufc can be ai-rivtMl at, the 

 averao-e of ineasui-eni«'nts hleudino- f)ne known type with another, 

 and it is inipossihh- to state whether the peculiarities ])]-eviously 

 i-(derre(l to will icsnlt as characteristics of the so-called ancient 

 Puel>los. or not. 



Fkuiuaim' tini. ISSd. — ( iK<ti,o(ii(Ar, Skciion. 



I'rof. W. H. Bariis in the chair. Fiv(- mendiers jneseTit. 



An amendment to the By-I.aws was ado})ted chano-ino- the day of 

 the reo'ular meetina" of the Section to the fii-st. instead of the third. 

 Friday in ea<-h month. 



Prof. Barris I'ead an interestinu' letter from i^rof. ("has. Wac-hs- 

 nnith, of Bnrlino-tou. Iowa, conhrnnnu- Piof. Bariis' views i(-oai-d- 

 ino- the o-eoloo-y of this locality, and r-ecooiiizina- his o-eims of 

 Sti-r((>('riiii(s as well established. 



Prof. Barris prc^sented sev(M-al s])ecimens of Ki(<niij>/i<ihis ih iuiri 

 f)-om Mi(diig-an, and from ("ook's (piariy at Dayenport. 



'J'lie followino- ])aper was pi-esenteil : 



Section of tlie Bluff at Sixtli Street, Davenport. 



I!V W. II. I'H.VIT. 



The l)lnii' alonu' Sixth stie(H, between Ripley and Hairison streets, 

 i'onsists of a hig-h nan-ow ridg-e between the Mississippi River bottom 

 and a very l)road ravine which extends back toward the west about 

 half a mile, nearly parallel with the front slope, and terminates very 

 abruptly at Harrison street. This ravine, like T)iick ( 'i-eek ami other 

 ravines and small streams on this side of the river, runs very nearly 

 parallel with the Mississi|)])i River, Imt descending- in the o])po- 

 site direction. 



The lo\vest portion expos(Ml to vitnv is composed of the usual "blue 

 clay" (c/), or glacial drift, always containing- more or lessg-ravel irreg-u- 

 larly distribute(k In addition, it also contains muiierous masses of 

 sand in as irregular positions as possilde, and looking- as if they had 

 been dropped in with the clay while in a frozen or otherwise solidified 

 condition. Occasional exceedingly (-rooked and ii-regular liiies of 

 stratiticaticm are also observable. Jt a])])ears evident that this whole 

 formation must have been deposited in turbulent waters, before the 

 cutting- out of the ravine or the river valley. This deposit comes up 

 to a leyel at about 90 feet above the low water level of the Mississippi 



