106 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
byella is not reported from the Camp Nelson and is rare in the upper Lebanon. 
The Camp Nelson probably thins toward the Central Basin of Tennessee and 
could thus be the equivalent of the Lebanon alone. The Camp Nelson forma- 
tion lithologically is like the Lebanon and has Camarocladia markings like that 
formation. On the chart the correlation is indicated as mainly with the Lebanon 
toward the Central Basin and with Witten and part of the Wardell to the east. 
Oregon formation.—This formation consists of 35 feet of cream-colored 
dolomite without fossils. The bed has been correlated with the lower Carters. 
Tyrone formation.—This formation consists of 75 feet of dove-gray lime- 
stone with conchoidal fracture and birdseye-type calcite rods. The formation has 
three metabentonites, one near the base, a second 55 feet above the base, and 
the third at the top just under the overlying Curdsville formation. Fossils are 
not common. The following brachiopods occur : 
Idiospira panderi (Billings) *S. cf. S. plattinensis Fenton 
Strophomena auburnensis nasuta Cooper Zygospira sp. 
*Strophomena cf. S. dignata Fenton 
Correlation of Tyrone formation—The Tyrone formation is correlated with 
the Cane Creek formation of southwestern Virginia and the upper Carters of 
the Central Basin of Tennessee. This correlation has hitherto been accomplished 
more by bentonites (Huffman, 1945) than by fossils because so few fossils have 
been taken from the formation. However, the strophomenoids are of Trenton 
types and the Zygospira indicates correlation with the range of Witten to Cane 
Creek. 
6. THE DISTURBED AREA AT KENTLAND, INDIANA 
An area of disturbed Ordovician strata occurs in the north half of sec. 25, 
T. 27 N., R. 9 W., along the south line of Newton County about 3 miles east 
of Kentland. Shrock (1937) describes this area in great detail. The Means 
Quarry is the westernmost opening and the McKee Quarry is the easternmost 
one. The middle exposure is the McCray Quarry. The sequence is divided into 
12 divisions: The lowest is the Prairie du Chien and the highest is in the 
Pleistocene. Divisions 1 to 9 are of interest in this discussion. 
Division 1.—Consists of 15 feet of sandstone assigned to the St. Peter but no 
brachiopods are reported. 
Division 2.—White quartzose sandstone with a few beds containing many 
mollusks of a few kinds. This bed is referred by Shrock to the Glenwood shale 
and sandstone of Illinois. 
Division 3.—Uncertain. 
Division 4.—36 feet of light-buff, dolomitic, arenaceous limestone and sand- 
stone containing Leperditia fabulites. 
Division 5.—Blue-gray to light-brown somewhat dolomitic limestone, fine- 
grained and arenaceous. Thickness about 20 feet. The following brachiopods are 
reported : 
Pholidops trentonensis minor = Craniops minor (Winchell and Schuchert) 
Pionodema cf. conradi = P. conradi (N. H. Winchell) 
