1 H ) \V A A C A D I'. M \ O !■• S C ( K N C F. S . 



2. lUue or dral), suI)-ciTst;i]liiie liuHstonp, luassivo. 



Good (iiKirry rock. Lowe r ciinoid Is'd aljovf^. 



jlgaricocrimi.s Avitli shallow c()lU'a^ itv. A. 



with sixteen arms. Adinoerimis ^;<'^r?K>r/o.sv/.s' 



Hall. St« Ills and [ilates of Eudadocvimis below. 



Fish remains ;> f ^ 1 1 



1. Limestone in thin layers, ('lif-rty. LoMer tish btcl. 



PlalifceraK fi^^xurcUa Hall. PJafii<c\'as crpd- 



eatem Hall ." '. (S feet 



\o. 1 is hut partially exposed li< r.'. its full thickness {no- 

 !)al)ly a£>'<>re£>-atini>- twenty feet. 



COIMIKLATION. 



The uppermost layer, No. 11, was discovered ;it a sinu'le 

 locality by Mr. L. A. Cox. In its lit'.iolo^ical character as 

 well as its fo?sil remains, it very much r 'sembles Wn crinoid 

 beds of Crawfordsville. The most common forms in the cal- 

 careous division at Keokuk ar3 wantini>- at Crawfordsville. 

 We are disposed to consider the lower part of those ])eds con- 

 sisting of twenty-five feet of shale as the C(pii\;;!eiU of th3 

 goedo bed at Keokuk. 



FOSSILS. 



The criiioids, the most prominent form, though not t!ie 

 most numerous. One-half the Keokuk forms apjiear at Keo- 

 kuk and about one-fourth at Crawfordsville. 



Braehijiods numerous, Spinfera and Prodnctiibc predomi- 

 nating, ^lost interesting collections of ci-inoids made hy Mr. 

 L. A. Cox and Mr. N. K. Hurk't. 



OBSERVATIONS ON THE KEOKUK SPECIES OF 

 AGARICOCRINUS. 



i;\- I'koF. c. H.(;()KnoN. 



{A /:■/,■„,■/.) 



Six species of A(janrorn'iuf.'< obtained from t!ie Keokuk 

 beds, of which three, viz: ^1. ahicn'raviis IJo'iner; .1. 



IPkcc. I. A. S.. 18S7-9.I >oo [Mar.li .0, iScp.l 



