0()Rl>ON-l'"OS .11, WOOD KKOM KKoKTK I.IMISIOM '.I ( 



hijitrroi'lcs, li()(fijcU!i(iii r/rtjf'iu'ciiHi^ ( '(iiitjilosoriis rjiizoiih ijUiix, 

 ('i/.s((tpf('rls hnlhit'crd, (JijKtoplcris fr(t(/ili's, Oiioclcd st^iisfhi/is, 

 (Jsinif}i(Ia c/(n//oiii(ni(i, Osinnii'la riamnmnni'a^ PJicrjopfcri'^ 

 lii'X{iti(j)i()pli'v<u Poli/po'liniii nih/an'y Picns. (Kjnih'iKi^ Pdhi'd 

 tilrojiitrimrcfi, W<in-ls/(i (>})fiiKit. 



PEARL BEARING UNI03. 



I'.V I'ROI-. V. M. Wll 11- R. 

 {No Ahstracf.) 



NOTES ON A FOSSIL WOOD FROM THE KEOKUK 

 LIMESTONE, KEOKUK, IOWA. 



\\\ I'kOK. C". H. C.ORnON. 

 {Al'iiract.) 



Some years since a [)()rli<)n of supposed fossil wood was ob- 

 tained from an eighteen inch limestone layer al)ont six or 

 eio-ht feet helow tlie ( ieode Ix'd. It was s(>cure(| hy Mr. S. 

 .). \\'ailaee and placed in t h(> rooms of tli(> Keokuk Lihi'ary 

 Association. A hi-iel' mentiou was made of it in a letter lo 

 the editors of tlr.' ^in/cr/'cf/ti p/oiinui/ of Science ami Arts, as 

 noted ill t!io May issue of ISTS. 



It I'onsists of a "seetii)n ahout thre(> feet lon<>", one end of 

 wliicli disappL'ars in the hank and tlit^ otlier a[)[)arently taken 

 ofl" in qiuirryini:- years Ix'fore. It is flattened into a tliin 

 coaly layer one-sixteenth to oae-sixMi of an inch thick and 

 IwcKe inches across, and seems to l)e s;'[)aiMted hy pressure 

 into two [)arts ajjparently not ((iiit" on the same plane." 'j'lio 

 thittened layer of carhonaceous matter has hiriivly disappeared 

 tliouah enouirh remains to show itsnatuvo, and the cast of the 

 woody Hher in t!ie limestone is \vell marked. 



At one place a leaf s"ar is (piite ch'arly defined and at 

 others small trans\erse ridires prohahly due to |)ressure. It 



[Pkuc. I. A. S.. i8S7-g| g7 [March lo, 1S90 J 



