136 Geological Equivalents. 
Names of strata which are known to Geologists of both Continents, 
with some of their organic associations in North America. 
I. PRIMITIVE. 
Geiss, slaty granite, 
Absence of all organized remains. 
GRANULAR LIMEROCK. 
Il. TRANSITION. 
ARGILLITE. ) 
Clay slate. Orthocera, Filices. 
Wacke slate. Terebratula, (species not yet ascertained.) 
First GRAYWACKE. 
Millstone grit, 
Old red sandstone. 
METALLIFEROUS LIMEROCK. 
Mountain, Encrinal. Encrinus transversus. 
Shelly. Fungites polymorpha, Cauymena Blumenbachit, Ortho- 
cera annulata, O. striata, O. undulata, Spirifer ambiguus, Os- 
trea, (nine inches long and three wide,) Asaphus, (large,)* f 
Oeyerrs latissimus, (found in a lias-like rock, between the 
shelly and cherty limerock.) Fungites discoidea, Columnatit 
sulcata, Productus hemisphericus, Scalaria semicostata, Enctr 
nus curvatus, Lithodendron dichotomum. 
Cherty. Cyathophyllum ceratites, C. vermiculosum, C. flexuosu™ 
C. vesiculosum, C. helianthoides, C. quadrigeminum. This gives 
us six species of the Cyathophyllum, which we have found in the 
cherty or cornitiferous limerock. These horns, as they are call 
ed, (Ceratites, stone-horns of authors,) and the hornstone, entitle 
the rock to the appellation Cornitiferous. Orthocera paradoxes _ 
Conularia quadrisulcata, Productus depressus, Gorgonia ripest: 
ria, Gryphea Macullocha, Terebratula dimidiata, T. octophea™ 
T. pectita? T. affinis? Spines of an Enchinus in abundance; 
me ee 
No organized remains discovered. 
* This is found in the upper soft slaty variety of the rock, which has bee? 80 a 
cessfully used for the lias cement at Chitteningo, &c. Dr. Smith, of Lockport, $°” 
me two specimens, taken from a continuation of the Chitteningo lias rock, immetl 
ately beneath the geodiferous limerock, on which the cherty (cornitiferous) repos “< 
For a temporary name, I callit Ocyeres latissimus. It contains twenty five jointss 
side lobes one half as broad as middle lobe; and the latter, half as wide 4 long ° 
joints of the middle lobe curved obliquely backward and then forward at its op 
and extend to such a depth as almost to sever the side lobes. Its middle lobe os 
inches and a half long. Remains of the original crust or shell appear to be ei 
in one of the specimens; which are dark colored or black, and separated by a 
white lines of carbonate of lime. The dark colored part seems to be a subst! “ 
from the rock. 
