PREBLE COUNTY, — 145 
very circuitous channel through the limestone rock. Attention was 
called to this interesting fact by the late Dr. Dunham, of Camden. 
The geology of Preble county, it is to be remembered, is identical in 
its various elements with that of counties already treated at considerable 
length. To these reports the reader is referred who desires a fuller 
sketch of the history written in the formations that make up its geo- 
logical scale. | 
As Preble county is the last one to be reported upon in the district, that 
contains the Upper Silurian formations, no more appropriate place can be 
found for the insertion of a list of the Niagara and Clinton fossils of Ohio. 
The appended catalogue contains such a list, no fossil being entered in it 
that has not been recognized or described by one or other of the Paleon- 
toloyists of the Survey: 
FOSSILS OF THE CLINTON LIMESTONE. 
CORALS AND BRYOZOANS. 
AST ROCERNIIMMVEINU SOMME ialseiele se mtaepantereiare sictalaicvataie\ers taleveselsiaiaierats uvateys\alers) ate Hall. 
Dip hiya hy limes pucosumMee eka ey tateavamiavei rele lGle/oia/a1elalslers eyetaicta) ciarelavereiaiaete Hall. 
Chaetetes—undetermined sp. 
Clathroporag@linbonensisyayscauc cee ete e saan stom asisisenisistciniestentaecintac)seisiaie H. and W. 
AVOSILESPNIACALEM SIS ream cyte erctoiirs atemiclcue Wato a gle uiaicrailalaularaiallsluvars a multanaesl Hall. 
Hal sitesucavenwWlanianacc seat anieteemacwiacelccie veletebenle cite wuinlars wats celal aes Linn. 
Hichenaliaiconcentricananestas ase ascaisce canis selasceicciciieine cess catan ae ne Hall. ? 
TEENIE) OU as ENO 0 Wee AN a ly ee ...- Hall, ? 
Streptelasma—undetermined sp. 
SUC D) DOW?) WADE G Gag Gbdoq6 GFOObd Lad O0> SOOO SB OSOU COU OSE OODCOR OCOD ObbbbE H. and W. 
MOLLUSCA. 
BRACHIOPODS. 
ACEP AM OCOSUGIAUR yee ne aeiniaineee watnc Wie eelsincajeccejecitneuimeanlcaiaonte Hall. 
Merista—undetermined sp. 
Orbhisbitorataleen aywtelste ccc peeteic jerclcleree Siler elistolatlpereteeieie re lora icicle laiaalenieteneera Dalm. 
CH) 10 SCT ROA CES] a2 so i A a ay Ge ge RM EE et 5 Fe 
PES LLeEpLoOnbynChus Sub plamaysaecoctwelna a= = mentee aialeiciia alata tareinrsia/eiarelaina= e)ale\aic = Hall. 
MTnrplesia Orton... 2-5/2.) = SBS ee BBB EEE OBB OHO BOO BBA HA SoA A tka fb SEE EEE Meek. 
JETS OWI WOOOESUEY GU G550 66 GAGS55 BAO CO0G00 BO0E55 Ce abeg Gag SOb bOKOEA GooOKd Hall. 
LAMELLIBRANCHS OR BIVALVES. 
Ambonychia—undetermined sp. 
CyjPMcarcditesterkU Cin CUM pee erccise welals\a)alsla\a'aelelolefaleleinta\n) aiale(=|ia(n\e/o =\sbalaiaia| eiaia/s H. and W. 
OMyaellomewne, lonlibe. so AeA Beak 8 Sea ORO nae ee a6 dood Sooo boDR Ho OnOuOenooe Hall 
Holopea—undetermined sp. 
