34 AUG. F. FOERSTE 



The limestone is exposed also twelve miles eastward, three 

 and one-half miles northwest of Waynesboro, near the home of 

 W. D. Helton on Beech creek ; here it is overlaid by the lime- 

 stone forming the base of the Richmond group. It occurs off 

 and on down Beech creek as far as its junction with Little Beech 

 creek, and is exposed also along the road from Waynesboro to 

 Clifton, a short distance west of the home of W. D. McAnally, 

 near the crossing of Eagle creek, three miles east of Clifton. 



The most southern exposure occurs about twenty miles south- 

 west of Clifton, at the mill variously known as the Maddox, 

 Welch, or Old Graham mill, located on Horse creek. Here only 

 the upper fifteen feet of the limestone is exposed, overlaid by a 

 few inches of clayey material belonging to the Richmond. The 

 Utica is the only Ordovician rock exposed along Willoughby 

 creek from its mouth at Lick Ford, for several miles up stream. 

 It occurs along the lower parts of Indian and Hardin creeks. 

 The most western outcrop is located on Miles creek, one mile 

 south of Saltillo, at the site of an old mill, a quarter of a mile 

 above the mouth of the creek. 



The typical section occurs at Clifton, on the Tennessee river ; 

 however, since the name Clifton has already been applied by 

 Professor Safford to the Silurian of Tennessee, the name Saltillo 

 has been chosen. 



The Saltillo limestone contains comparatively few species of 

 fossils, and most of these are not abundant. The most widely 

 distributed species is a variety of Dalmanella emacerata,^ 20™'" in 

 width, which is abundant at Clifton and on Beech creek, north- 

 west of Waynesboro. There is also a smaller variety of Dalman- 

 ella at Clifton, with coarser plications, identified as Dalma?iella 

 multisecta." 



In addition to the Dalmanellas named, the following fossils 

 have been found in the Saltillo limestone at Clifton. Zygospira 

 modesta is very abundant in several layers near the top of the 

 limestone. A globular sponge with acicular spicules is very 

 abundant in one of the lower layers ; it is probably a species of 



-'Pal. New York, Vol. VIII, Plate V c. Fig. 2. 

 ""Pal. Olivo, Vol. I, Plate VIII, Fig. \,a,b, c. 



