430 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
NOTES ON DISTRIBUTION OF THE BROWNSPORT GROUP. 
The general distribution of the various late Niagaran formations 
in the valley of the Tennessee River has been noted briefly in the 
preceding pages. Leaving this area and proceeding toward the 
Central Basin of Tennessee, the most eastern exposure of the Browns- 
port, according to Foerste, is along the Nashville, Chattanooga, and 
St. Louis Railroad, at the bridge 1$ miles west of Pegram, about 21 
miles east of Dixon, Tennessee. Here, following Foerste’s descrip- 
tion and section, the base of the Brownsport is a very fossiliferous 
clay, 8 feet in thickness, directly overlaid by Mesodevonic limestone. 
The limestones underlying this clay bed are referred by Foerste ¢ 
to the Dixon and Lego, the latter formation being made the equiva- 
lent of the Louisville. We can not agree with these determinations 
and believe the sections presented below will prove at least that his 
so-called basal beds of the Brownsport are the equivalent of the coral 
beds of the Lobelville formation, while the argillaceous limestone 
at the base of this section appears to belong to the lower part of the 
same formation. | : 
Section at railroad bridge, 14 miles west of Pegram, Tennessee. 
Devonian. , Feet. 
Chattanooga black shale. Lower layers with rather numerous lingu- 
VOLES 2 ibe tte ee 3 Se 7 ee Ve Us SN rang er i eA ea RE ne 
Hardin sandstone. Rather massive, sandy shales with Cycloras 
FW aXo rl Wb aka DE LO) (6 Ketp etary ances es tiem Maes NED cc cod oe a el eee ee Er lL ae 1-2 
Mesodevonic limestone: : 
(b) Massive, arenaceous limestone with Tropidoleptus carinatus, 
ATO GUROGPOUOUS, Cues, (Ose anihnoyn)) 1-2 
(a) Coarsely crystalline, massive, crinoidal limestone with Poly- 
pora shumardi, Cystodictya gilberti, Nucleocrinus ver- 
GOONS, Ewes (COiavaraus lees) 8 
Silurian. 
Lobelville formation. 
Fossiliferous blue and yellow shales holding the following spe- 
cies: Calceola tennesseensis, Favosites discus, F. favosus, F. 
venustus, Thecia major, T. minor, Heliolites interstinctus, H. 
subtubulatus, H. micropora?. Halysites catenulatus, Cladopora 
reticulata, Atrypa reticularis niagarensis, Spirifer foggi, Un- 
cinulus stricklandi, Meristina maria-roemeri, Wilsonia saffordi, 
CE ae A BS RR OA TEI Sg IRE UAE Sree AS pg On 8 
Argillaceous limestone with a few shale layers___--_-_-_----__- 30+ 
Fossils few, but several corals of species occurring in the | 
shale above were noted. 
A very instructive Niagaran section is exposed in the quarry 3 
miles west of Newsom, Tennessee, at the end of a short spur from the 
Nashville, Chattanooga, and St. Louis Railroad. At the time the 
section at this locality was made the quarry face was so steep that 
@ Journal of Geology, XI, 1908, Dy BOC 
