\:\1.1.-^t-.K'n,()i;V OF KAS'IV.KN .\kK.\N.->.\.S. .s,» 



;'(M-()ll(>cti(ii)s of m\ lt()\lu)i»() diivs Mi-c too iiidrlinitc lo Ix-rcr- 



Tlicsc i;(M»cr:il Holes w err f()llo\V('<J Itv :i l(\i;ist('i- of the spc- 

 <i('s ol>s('r\(*cl ill wliicli were li-ivcii notes on size, ahund.iiK-e, 

 <listril»iitinM, vjiriatioiis and other facts of ohsorvation. The 

 lotal nunilx'J" of species on which data were obtained were 

 al)out eiiiiitv, the oaks l)eiiio' the most important ccononii<- 

 ally. The l>otanicaJ rehitions of the area need a thoroniih 

 •siftiui; and pr^nnise a licli ;tie]d t(» \\hoe\('r sjiall nnd<'rlake 

 the stud\. 



ON THE GEOLOGY OF EASTERN ARKANSAS, 



in I'KOF. K. KI.I.SWOK f n (.Ali 



i'his paper \va>> a euntinnation anil iwtension of the one 

 presented at the meeting- of I ^S.S, niid like it was based on 

 thetield work done under the auspices of the Arkansas (reo- 

 !o,i>i<"iil survey. The area studied was much more extensive 

 than that reported on in the i)recedini>- y(>ar. 



The ijeiieral re<»i()ii examined is all tliat portion of the 

 .State which lies east of the St. Louis, Iron Mountain and 

 Southern Railroad and north of the Arkansas River. The 

 fi'oion particularly examined extends from Helena north to 

 ■he Missouri State line, included a particular study of the 

 licoloirical formations seen in Crowley's Ridae and souaht to 

 <'onnect these terranes with those of similar -.x^xv in other por- 

 tions of the State. The more obvious fact> iileancd durinir 

 the field investiii-ations are the followinuf: 



'I'he eastern half of the State of Arkansas is included within 

 an area which, until coinparati\ cly recent liCoIoeicMl time, 

 was entirely sul)incr<»:i'd under a northward extension of the 

 (iulf of Mexico. l{eachini>' away southwestward from near 

 the mouth oi the Ohio River, in a nearly direct line, this old 



[Pk.ic. I. A. S . i'!-!7-;. I 85 [March 0. 1800.I 



