570 A. F. FOERSTE 



exposure is formed by the Lego bed, 25 feet thick, directly over- 

 laid by the Hardin sandstone. The Brownsport bed is probably 

 exposed several miles farther down the river. At Riverside only 

 the base of the Lego bed, 6 feet thick, is exposed. The west- 

 ward dip of the strata at this point, however, is so great that 3 

 miles farther westward, at an exposure about a quarter of a mile 

 south of the home of Ed. Walker on the east side of Tucker 

 branch, the Brownsport fauna is found in a calcareous clay about 

 14 feet below the Hardin sandstone. It includes such charac- 

 teristic species as Favosites Forbesi discoidea and Pisocrinus milli- 

 gafii; Fistulipora hemispherica is also present. Northwest of 

 Flatwoods, at the mouth of Little Opossum Creek, the Silurian 

 exposure is 48 feet thick, and is directly overlaid by the Hardin 

 sandstone. Thecia major occurs at the top ; Calceola tennesseensis 

 was found 9 feet below the top; Astraeospongia meniscus, 12 feet 

 below the top; all are Brownsport fossils. The Dixon bed is not 

 exposed ; it is therefore impossible to determine whether it 

 retains its red color as far eastward as Flatwoods. 



The Brownsport bed was not detected at the W. D. Helton 

 locality, 3^ miles northwest of Waynesboro, on Beech Creek; 

 the total Silurian section is here 104 feet, and the top cannot be 

 far beneath the base of the Brownsport bed. The Silurian here 

 is directly overlaid by the Hardin sandstone. The Silurian bed is 

 exposed about 6 miles west of Waynesboro, on the south side of 

 Hardin Creek, where the road from Waynesboro to Dr. Yeiser 

 and Martin's mill crosses Brewer Branch. It consists chiefly of 

 white clay with some limestone, about 20 feet thick, and con- 

 tains Fistidipora hemispherica. It is directly overlaid by the 

 Hardin sandstone, 1 1 feet thick. South of this locality, west of 

 the home of Dr. E. R. Yeiser, 6 miles east of Martin's mill, the 

 clay and crumbling limestone immediately beneath the Hardin 

 sandstone contains Astraeospo?igia meniscus and Unci?iulus strick- 

 landi. The presence of the sponge indicates the Brownsport 

 horizon. Brownsport fossils occur in the white clay, 3 feet thick, 

 which overlies the Dixon bed at the Sulphur Spring on the Ike 

 Ross and Arnold place on Horse Creek. It is not exposed 

 farther eastward along the southern boundary of Tennessee, but 

 probably extends under cover as far as Whittens Stand. 



