562 A. K FOERSTE 



3 feet thick. As at all other localities in southern Tennessee, it 

 consists of three layers, in ascending order : soft clay containing 

 a calcareous rubble, 18 inches thick; hard limestone, 6 inches 

 thick ; and soft red clay, i foot thick. 



At Clifton the Saltillo limestone is overlaid by the Warren 

 bed, a cherty limestone, 3 feet 4 inches thick. This bed has so 

 far not been identified elsewhere in the Tennessee River Valley. 

 The Warren bed is overlaid by the Richmond limestone, 19 feet 

 thick, followed by the Mannie clay, 151^ feet thick. North of 

 the landing the Clinton limestone is exposed. It is i foot thick, 

 and consists chiefly of greenish-brown chert, although part of 

 the bed is often less siliceous and is more of the nature of ordi- 

 nary limestone. The color of this limestone varies usually 

 between white and light brown, but a small part of it is tinged 

 with salmon-brown. Both the limestone and chert is fossil- 

 iferous. The fauna has a general resemblance to that found in 

 the Clinton of Indiana and Ohio. The presence of Lichas brevi- 

 ceps cli?itone?isis , Calymmene vogdesi, Cyrioceras {^Glyptoceras) sub- 

 compressufn, Orthoceras ig?iotum, and Cypricardinia u7idulo striata 

 may be mentioned. The occurrence of Cyrtoceras stibcompressum. 

 is of special interest, since it indicates that this species has a 

 much wider geographical range than hitherto suspected. Imme- 

 diately above the Clinton at Clifton there is a series of compara- 

 tively thin beds of clayey, reddish limestone, 14 feet thick, 

 referred to the Osgood horizon. Pisocrinus gemmiformis and 

 Stephanocrinus osgoode?isis occur within 2 feet of the base of the 

 Osgood bed, and their range extends from this point through the 

 Osgood into the Laurel. They are especially abundant in the 

 harder limestone, 2}4, feet thick, which forms the base of the 

 Laurel bed. Near the middle of the Osgood bed there are sev- 

 eral layers full of very large, coarse, crinoid stems. They 

 contain also various undescribed species of Illaenus, Lituites, 

 Orthoceras, Hyolithes, Cyclonema, and Platyceras. Atrypa reticu- 

 laris is also present. Caryocrinus ornatus, the typical form, occurs 

 at this level and also within 2 feet of the top of the Osgood bed. 

 Large specimens of Orthoceras occur at all levels, as usual at this 

 horizon in central and southern Tennessee. The Laurel bed con- 



