No. 1621. 
LATE NIAGARAN STRATA—PATE AND BASSLER. 
425 
Corals at Graveyard Glade, 13 miles west of Bob, Tennessee. 
Thecia major Rominger. 
Thecia minor Rominger. 
Heliolites interstinctus Linnaeus. 
Heliolites subtubulatus McCoy. 
Plasmopora follis Edwards and Haime. 
Amplexus shumardi (Edwards and 
Haime). 
Favosites discus Davis. 
Favosites spongilla Rominger. 
Favosites favosus Goldfuss. 
Favosites niagarensis Hall. 
Favosites  cristatus WKdwards 
Haime. 
Favosites cristatus major Davis. 
Favosites louisvillensis Davis. 
Favosites venustus Hall. 
and 
Hridophyllum dividum Davis. 
Cladopora reticulata Hall. 
Cladopora complanata Davis. 
Omphyma verrucosa Rafinesque and 
Clifford. 
Alveolites niagarensis Rominger. 
Alveolites lowisvillensis Davis. 
Cystiphyllum niagarensis (Hall). 
Cystiphyllum granilineatum Hall. 
Heliophyllum dentilineatum Hall. 
Heliophyllum gemmiferum Hall. 
Heliophyllum radicula (Rominger). 
Halysites catenulatus Linnaeus. 
Halysites nexus Davis. 
Striatopora huronensis Rominger. 
Coenites verticillata Davis. 
Romingeria vannula Davis. 
Localities affording good exposures of the coral zone have been 
noted in several of the sections already presented, but the Graveyard 
Glade, Brownsport Furnace, Peeler’s Pond, Lobelville, and Jacks 
Branch, near Linden, are worthy of special mention. 
DECATUR FORMATION. 
The closing member of the Niagaran in West Tennessee is a mass- 
ive, white crinoidal limestone with some magnesian beds, sometimes 
reaching a thickness of 70 or more feet. This has been noted in 
several sections given on previous pages as the Decatur limestone. 
In the immediate vicinity of Decaturville this limestone is represented 
mainly by residual bowlders, but at Tuck’s Mill, 14 miles north of 
Decaturville, the formation is well exposed. The section at the latter 
place may be considered as typical for the formation, but its occur- 
rence at many places in Decatur County has given rise to the name. 
At the bridge crossing Beech River, 14 miles north of Decaturville 
on the road to Parsons, the white, coarse-grained Decatur limestone 
rests unconformably upon the Eucalyptocrinus beds of the Beech 
River formation, a short distance above the level of the river. The 
section continues up the hill back of the mill, and altogether about 
70 feet are-exposed. Fossils are apparently not abundant, but Unc- 
nulus stricklandi, Wilsonia saffordi, Pachydictya crassa, Pennirete- 
pora sp., and other Niagaran fossils were observed. It will be noted 
that all of these fossils have an extended range, so that the character- 
istic fossils of the Decatur limestone can not yet be given. Toward 
the top of the Tuck’s Mill section this limestone becomes slightly 
shaly, and here fossils are found in most abundance. 
