MEDINAN, NIAGARAN, AND CHESTER FOSSILS 
105 
G. NIAGARAN FOSSILS FROM JEPTHA KNOB, KENTUCKY 
Jeptha Knob is a conspicuous elevation of land 6 miles south- 
east of Shelbyville, in Shelby county, Kentucky. The knob 
attains an elevation of about 1300 feet above sea level. Its 
upper levels consist of Richmond strata, but on its upper parts 
are found also residual fragments of Silurian strata, showing 
that it had once been overlain by the latter. Among the latter 
may be recognized a few fragments of crystalline limestone, which 
both lithologically and paleontologically can be identified as of 
Brassfield age. Most of the Silurian fragments however consist of 
flat pieces of chert. These pieces of chert evidently were derived 
from chert layers interbedded in some limestone formation. 
Since in the counties directly west of Shelbj^ county, including 
Oldham and Jefferson counties, it is the Laurel member of the 
Magaran which contains flat layers of chert in abundance, these 
Silurian chert fragments on Jeptha Knob are interpreted as also 
of Laurel age. 
Both Prof. Arthur M. Miller of the University of Kentucky, 
and Prof. Walter H. Bucher of Cincinnati University have been 
very active in securing fossiliferous fragments of this Laurel 
chert, and both have secured fragments of a large species of 
Calymene, similar to Calymene cedarvillensis Foerste, but possibly 
belonging to a distinct species. The fauna includes 
Favosites favosus (Goldfuss) 
Lyeilia thebesensis Foerste 
Pachydictya cf. bifurcata (Hall) 
Dalmanella sp., with fine radiating plications 
Dalmanella sp., with very coarse plications 
Rhipidomella hybrida (Sowerby) 
Platystrophia daytonensis (Foerste). (Plate XV A, fig. 11.) 
Schiichertella sp. (Plate XV A, fig. 12.) 
Strophonella milleri Sp. nov. 
Camarotoechia indianensis (Hall). (Plate XV A, figs. 10 A, B.) 
Cypricardinia jepthaensis'Sp. nov. 
Hormotoma sublaxa (Conrad) ^ 
Lophospira bucheri Sp. nov. 
