No. 1621. LATE NIAGARAN STRATA—PATE AND BASSLER. 491 
Layer B. Bluish limestone, partly fine grained and partly crinoidal, hie 
with Wilsonia saffordi, Uncinlus stricklandi, Schuchertella sub- 
planus, Gypidula roemeri, Camarotoechia neglecta, Nucleospira 
COncEentnica. and WMernsvingd MArig-Toecmentza = a 9 
‘ Layer A. Sandy “ Gant limestone” forming a projecting ledge______ D 
Beech River formation. 
Whitish clays and soft limestone, with sponges, brachiopods, and 
CLL OL CS Gaemeceee eters teem ee see Neate When eee vans Tee Tee T NN Are ee 57 
Dixon formation. Red shale and shaly limestone. 
Foerste did not recognize his ** Gant bed” in any but a small area 
along Indian Creek in the vicinity of Martin’s mill and the Gant 
homestead. We have found limestones and shales, carrying great 
numbers of brachiopods of the species listed by Foerste, succeeding 
the Beech River formation and extending from a point just south of 
Decaturville continuously eastward and southward through the area 
drained by the Tennessee River and Indian Creek. At Brownsport 
Furnace these brachiopod beds are 25 feet in thickness, and it is 
strange that the similarity of their fauna to that of the * Gant lme- 
stone ” was not noticed hitherto. One-half mile below Bob, on the 
west bank of the Tennessee River, the red limestones and shales are 
succeeded by about 42 feet of limestones and shales abounding in 
brachiopods. ‘The section here is as follows: 
Section one-half mile below Bob, Decatur County, Tennessee. 
Feet. 
AEG De lrvalll Sooo tl © Were ee aor toe eRe eee ee tee eg eS — 
Bob formation. ; 
(f) Hard grayish clay at top, soft yellow clay in middle part, and 
soft blue clay at the base with brachiopod fauna listed below 
(GUTTER) Rag 8 bal ae Rene Sees he PAE ee ee er Wh 14 
(e) Hard buff limestone, blue upon fresh exposure_____________=__ 1-2 
(d@) Soft blue clay with brachiopod fauna of bed below____________ 2 
(c) Yellow argillaceous limestone layers, two to three inches thick, 
alternating with soft yellow clay. Brachiopods numerous, Gypi- 
dula roemeri, Meristina maria-roemeri, Nucleospira concentrica, 
Dictyonella gibbosa, Uncinulus tennesseensis, and Wilsonia saf- 
(OLD eCIn Sap ARb Culaelyaca DUNO anita ee ee ee 14 
(6) Rather massive white limestone in 8 to 12 inch courses. Un- 
cinulus stricklandi not uncommon_____________ p posse sss sss s== 10 
(a) Red limestones and shales to water’s edge. Large Uncinulus 
SUMO: Cubs, Howie Enno ee ee eee ee 20: 
As noted in the above section, all of these brachiopod bearing strata 
are grouped together in the Bob formation, this name heing selected 
on account of the excellent exposure at Bob Landing, Decatur County, 
Tennessee. 
The Bob formation is likewise found at a number of points north 
of the general area just described, and here the limestone part of the 
strata seems better developed. At Lady’s Bluff, 16 feet of limestone 
Proce. N. M. vol. xxxiv—O08——28 
