LIMESTONES OF WESTERN TENNESSEE 561 



On the road leading from Kelley Landing to New Era, north 

 of the branch north of Bee Creek, the Saltillo limestone is over- 

 laid by Richmond limestone, 171^ feet thick, followed by crinoi- 

 dal fine-grained limestone forming the base of the Silurian. 



Along the Dry Branch, directly north of New Era, the Sal- 

 tillo limestone is overlaid by Richmond limestone, 125^ feet 

 thick. The Richmond limestone is of a bluish color. At the top 

 it is very coarse-grained, consisting chiefly of fragments of 

 brachiopod shells. The base of the Silurian is formed by a 

 hard, white, massive limestone, 20 feet thick. The lower and 

 middle part of this bed is more crinoidal. The upper third is 

 more dense, and where weathered has a greenish-brown tint, 

 similar to that shown by the cherty Clinton at Clifton. No char- 

 acteristic fossils were discovered in the bed at New Era. Strati- 

 graphically, however, the bed occupies the same position as the 

 beds referred to the Clinton at Clifton, Riverside, and Iron City. 

 Overlying the hard white Clinton limestone along the road lead- 

 ing east from New Era is a soft reddish limestone, 6>^ feet thick, 

 referred to the Osgood, followed by reddish limestone inter- 

 bedded with whitish layers, a section 3 feet thick, also referred 

 to the Osgood and evidently forming a transition to the Laurel 

 limestone. The Laurel limestone, 27 feet thick, is a rather hard, 

 well-bedded, reddish limestone. The Waldron bed is about 3^ 

 to 4 feet thick. As in the case of the exposures at Riverside 

 and Iron City, the shales along the middle of the Waldron bed 

 are replaced by a layer of very white limestone, 9 inches thick. 



At the foot of the bluff northwest of Gienkirk, three miles 

 north of Clifton, the Richmond limestone is overlaid by a con- 

 siderable thickness of Mannie clay, also of Richmond ?ge. The 

 massive white limestone at the base of the Silurian section, 

 referred to the Clinton, is only 3 feet 9 inches thick. It con- 

 tains Illaenus Daytonensis. The Clinton is followed by soft, red- 

 dish limestone, 12 feet thick, weathering back, referred to the 

 Osgood. Overlying this is a more solid reddish limestone, 3 

 feet thick, forming a transition to the solid Laurel limestone 

 immediately above. The Laurel Limestone is reddish as at New 

 Era and northward. It is 21 ^ feet thick. The Waldron bed is 



