CORRELATION OF STRATA. 
TRILOBITA, 
ECHINODERMATA, 
ETC. 
Tsotelus suse Whitfleld.................. 
Ptychopyga ulrich, n. sp................. 
Nileus vigilans M. & W.................. 
Tilenus americanus Billings ............. 
Tllwous cf. indeterminatus Walcott...... 
Thaleops ovata Conrad................... 
Bumastus trentonensis Emmons......... 
Bumastus orbicaudatus Billings......... 
Bathyurus extans Hall................... 
Bathyurus spiniger Hall................. 
Bathyurus schucherti, n.sp.............. 
Bronteus lunatus Billings............ ... 
Dalmanites achates Billings............. 
Prerygometopus intermedius Walcott... 
Pterygometopus schmidti, n. sp......... 
Pterygometopus callicephalus Hall...... 
Ceraurus pleurexanthemus Green........ 
Cyrtometopus scofieldi, n. sp............. 
Hncrinurus vapnulus, n, sp.............- 
? Encrinurus raricostatus Walcott....... 
Encrinurus cristatus, n. Sp..............- 
Cybele winchelli, n. sp................-..- 
Odontopleura parvula Walcott........... 
Arges wesenbergensis var. paulianus, n. 
Platymetopus cucullus M. & W.......... 
Platymetopus robbinsi Ulrich............ 
Platymetopus bicornis Ulrich............ 
Proetus cf. parviusculus Hall............ 
Harpina minnesotensis, n. sp..........-. 
Harpina cf. H. ottawensis Billings... .... 
Harpina rutrellum, n. sp...... .......... 
Cyphaspis (?) galenensis, n. sp........... 
ECHINODERMATA and other fossils not 
described in this volume. 
OCMC AUAIS Te GOGcacsooonesass cond geac 
I) GTAGMOCLUAUS SS Dhtree ctr eieteteleisiensier=c- leiel-’> 
IMDENGTOCTINUS We SP). c-- eee cesses 
MENATOCRINUS snes Dee ese ele eile 
ID Erol Rosi ATS! 15° SiDssoccceocseoaunose sage 
Merocrinus laxus Ulrich................. 
Palxocrinus articulosus Ulrich.......... 
Gly MtOCriMUS Hr io eases utes nie aieterereteisie 
IPOTOGRIMU Sierectresecemicnttoeieeelers tos cis cements 
Carabocrinus magnificus Ulrich.......... 
@aTrapOGrinUS:eriaciccss = clei estvcvtelverss east 
(OPimManoeiniGhoscous onus ocebeonoadseepes 
Cremacrinus punctatus Ulrich........... 
Pleurocystites squamosus Billings....... 
Pleurocystites angulatus Uirich.... .... 
Pleurocystites abnormis Ulrich.......... 
Hurycystites granosus Ulrich............. 
Glyptocsytites grandis Ulrich............ 
Glyptocystites, sp. undet................ 
SBA SASHOIy cearevacte oeteis arctciavee u sreateteretaraiats Shsteters 
Edrioaster bigsbyi Billings............... 
ARLACHIMIG . 35 Gade ouboneonedoEbenn sone ac 
AO CVACEIMUS pias viele ec ia\s ew 1cis els Mec ees 
Lichenocrinus crateriformis Hall and 
VRIES Sid God endo God bo AOR e onto nn 
Lichenocrinus affinis Miller.............. 
@WyclocyShoidessy. cer ceces sc cs ciinis's cis ere 
Pasceolus globosus Billings.............. 
Lycrophycus ottawaensis Billings........ 
Serpulites dissolutus Billings............ 
COLNUMLES pay Spree mare ce cise gisicesicies 
Cormulites ssp undetreceacec esc sees aes 
OntoniaySpsandescs mene caocnsesseeacece 
Trenton Period. 
Stones Black 
River River Trenton 
Group. Group. Pp. 
ol _- 
1h S sI13 | a 
-|co - | of @ 
~ |SlSi2is| a2\el. 
aHle}e]/,1/2| s]8 eal 2 
B/S/—2]€| s |s2] 4 |28) 2 
~ 
Olea] | 8 lee) 2 ea) 3 
S|%]| als] loos fas! 5 
El/S (2) a)] gles slesic 
3)2|3]4| 2 (321s (28 = 
Tl \)/n)]e@15 isa] laa| & 
>< |} 3x 
Xa [exe 5x os 
>< || 3x 
sx || 3< 
Xai [exe x es 
x 
x 
Sa ak 
uel Al 
x 
Xs 
x 
x6 || GP ll-as|| x 
eX roan | eX 
xe|] S61 5:0] | sre) x1 5 ]| si || 2s 
Po) 26] WPe|} Se || sx || sel! Sk |] Se 
X 
x/Tt]T 
ir |) 
? 
xe 
x 
x 
x 
ae 
x 
x 
?x|? x 
x 
x 
x 
x 
Bxa 
x 
xe 
x 
><} 
x 
x 
x 
x 
3e,|| 38 
|r lt 
n 
x 
xe 
axe 
x 
x 
Ka |) eX | exe ex s<,|| Se |] Sk 
x 
x 
36 |] 3 
SX | MEX Xa | ex 
x¢ || 52 |) 3 
Hudson or 
Cincinnati 
Period. 
: A 
a ic) 
= = 
=| 2), 
| bp rs 
=] ol 
ela| = 
eo ° a 
a g = 
y c= ° 
=) = Z 
P|s ie) 
x 
Ss 
iS) 
s 
s 
i) 
sT 
Sel 
x 
x 
7, 
x 
x 
[BET 
TU 
x R 
Tv 
TUL 
x 
Tv 
Tennessee. 
CXXill 
2 
-) a 
al 3S 
Cs} 
E 
a te) 
T # 
B 
B 
BT BT 
?H 
Ss B 
7 BT 
T 
yy tT 
T 
ae BtoH 
1 
Te 
T 
& 
mT 
T 
T 
ap 
BT 
