Strophomena and Other Fossils 
35 
One of the most interesting occurrences of Strophomena vicina 
is at Carnestown, in Pendleton county, on the Ohio River, in 
strata associated with 'Eridotrypa mutahilis, Eridotrypa tren- 
tonensis, Prasopora falesi, Prasopora simulatrix, Callopora mul- 
titabulata, Dalmanella bassleri, Platystrophia colbiensis, Plectam- 
bonites sericea, and Zygospira recurvirostra. At Frankfort, 
Callopora multitabulata ranges up as far as the Strophomena 
horizon. Prasopora simulatrix, from the Wilmore, gives rise 
to a closely similar form which reaches the same Strophomena 
horizon, and Eridotrypa mutabilis certainly occurs in the lower 
part of the Paris bed. As far as the present evidence warrants 
any conclusion, there is no necessity of regarding the Strophomena 
vicina horizon at Carnestown as below the base of the Paris 
bed. 
Thin specimens of Strophomena, similar to those at the top of 
the section described from the vicinity of Flanagan, occur in the 
upper part of the Paris bed, 2 miles southeast of Brennan Springs, 
in the northeastern part of Henry county. 
Strophomena trentonensis was described by Schuchert from the 
upper part of the De corah and the lower part of the Prosser 
in Minnesota, This is distinctly below the level of the Paris or 
Bigby bed, in Kentucky. The striae are described as more deli- 
cate than those of Strophomena planumbona-subtenta, and the 
oblique wrinkling along the cardinal margin is said to be a more 
constant feature than in that species. Neither of these state- 
ments is true of Strophomena vicina. There can be no doubt, 
however, of the close relationship between these two forms. 
No species of Strophomena is listed from the Bigby included 
within the area covered by the Columbia folio, but the Stropho- 
mena recorded by Schuchert as occurring near the top of the Tren- 
ton near Nashville, Tennessee, may be Strophomena vicina, 
rather than Strophomena trentonensis. No species of Strophomena 
is known from any part of the Wilmore or Logana (Hermitage of 
Ulrich). 
As far as the origin of Strophomena vicina is concerned, it was 
introduced into central Kentucky during the deposition of the 
argillaceous limestone 55 feet below the top of the Paris or 
Bigby bed. This argillaceous horizon is best developed on the 
western side of the Cincinnati geanticline, in Franklin, Woodford, 
