Dec., 1912.] Ordovician Section, Lake Huron Area. 
4i 
Among other forms occurring in the Cloche island limestones 
may be mentioned Rafinesquina inquassa, Dalmanella gibbosa, 
and Conradella obliqua, all of which suggest Black river age. 
Streptelasma profundum, Rhynchotrema (?) ottawaensis, Ortliis tri- 
cenaria, Dinorthis pectinella, a small Dalmanella belonging to the 
testudinaria group, Strophomena filitexta, Plectambonites curds- 
villensis, Leperditia fabulites, Bumastus milleri, and numerous other 
species range from the Cloche island Black river limestones into the 
Curdsville strata, exposed at the base of the Trenton on Goat 
island. Solenopora compacta, Herbetella bellarugosa, and Actino- 
ceras bigsbyi , hitherto not found above the Cloche island limestones, 
may eventually be found also in the Curdsville beds on Goat 
island, since they occur in the Trenton elsewhere. Not being famil¬ 
iar with Black river faunas, the writer submitted the fossils 
collected to Prof. Percy E. Raymond, and was pleased to receive 
his confirmation as to the Black river age of the Cloche island 
limestones. 
The bryozoans were submitted ta Dr. E. O. Ulrich, with the 
following results: Batostoma humile, B. varium, B. winchelli, 
Eridotrypa mutabillis, Homotrypa minnesotensis, Nicholsonella 
ponderosa, Phyllodictya frondosa, Phylloporina sublaxa, Prasopora 
insularis are represented by varieties also occurring in the Decorah 
shales of the Mississippi basin, and thus tend to corroborate the 
reference of the Cloche island beds to the Black river. As a matter 
of fact, Batostoma winchelli and Homotrypa minnesotensis were 
identified also from the Curdsville bed in the lower part of the 
Trenton on Goat island, and some of the other species, such as 
Batostoma humile, Eridotrypa mutabilis, and Prasopora insularis, 
are known to range upward into the lower Trenton, but, to Dr. 
Ulrich, this bryozoan fauna presented a distinct Decorah shale 
facies. Most of these bryozoans were collected in the upper part 
of the Cloche island beds, above the SO foot level mentioned in the 
preceding lines. Further collecting may indicate the presence 
also of other faunas within these beds. 
5. Curdsville and other Trenton Exposures on 
Goat Island. 
The lowest exposures of the Trenton on Goat island present a 
fauna very similar to that of the underlying part of the Black river, 
excepting for the apparent absence of Receptaculites, Maclurea, 
Gonioceras, and a few other fossils, and the presence of the inter¬ 
esting crinoid and cystid fauna known from Curdsville, Kentucky, 
and from Kirkfield and other Trenton localities in Ontario. 
While a form of Dalmanella belonging to the testudinaria group, 
and Plectambonites curdsvillensis are present in these lower Trenton 
strata on Goat island, they occur also at various horizons in the 
underlying Cloche island limestones. 
