414 PROCEEDINGS OF THE NATIONAL MUSEUM. vot. xxxiv. 
Linden formation. Feet. 
Bluish= shales: wath Dr y.0 Zo a ees Bi Tas ae eon eee CR ee a ay 
Residual limestone bowlders holding Camarocrinus and Helder- 
Hergian “DrachioPOds sei ees Nee Se ee eae eee elena ne gk ae ae ae 
Silurian. 
Decatur limestone. Massive, white crinoidal limestone becoming 
sellany aah ney Ge CIN (RO 70 
Beech River formation. 
Eucalyptocrinus zone. Bluish shales becoming yellow toward — 
(ELCs ita 0] eee inept ae pe ee pa sie TE REL Ate ie Sk Se ha Ree er eo 20 
Troostocrinus zone. Fossilferous shales varying from blue | 
through yellow to white in order, with a limestone band in the 
NOBUO (6B (spa) Of) te ee necator egeea net le aE ee ee Ce eta Nn  2 eS ea 24 
Coccoerinus zone. Shaly limestone in the upper part and whitish 
limestone easily disintegrating into clay in the lower-_________ 25 
Dixon formation. Purplish shales in lower part and red crinoidal 
LIMESTONE HIN UP PONS sea AU AE BEI ein eR eta pate rE ale 35D 
Lego limestone. Grayish limestone with a few red layers__________ 30 
Waldron shale. Purplish shales with an intermediate layer of white 
limestone. J/imulus waldronensis and other Waldron fossils noted_ 4 
Laurel limestone. Pale purple, massive limestone__________________ 25 
Osgood limestone. Massive white crinoidal limestone with a tend- 
ency to form cliffs when favorably exposed_________--_____-______ 10 
Ordovician. 
Arnheim (‘ Warren”) formation. Coarsely crystalline phosphatic 
limestone v2 22k ie Ses Sais EE hie 0 aes anes Spee oe ame ee 2 
Hermitage (‘“‘ Saitillo”’) formation. Argillaceous limestone and shale 
with usual Lower Trenton fossils. This, the lowest rock of the 
vicinity, is exposed for a distance of a mile along Rushing Creek 
CASt/OF  DeCAtUE vie ha ae re FS eA EEE oe Si RO OR gape geese 
OW 
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LADY’S BLUFF, PERRY COUNTY, TENNESSEE. 
This in one of the highest and most beautiful bluffs along the Ten- 
nessee River, and furnishes an excellent section of the Niagaran and 
Helderbergian rocks. Lady’s Bluff is on the east side of the Ten- 
nessee River, 1 mile below Mousetail and just below the mouth of 
Lick Creek, in Perry County. In this section, which follows, the 
absence of the coral beds normally preceding the Decatur limestone 
is noteworthy. 
G Section at Lady's Bluff, Perry County, Tennessee. 
Gravel beds. 
Devonian. 
Linden (Helderbergian) formation. Feet. 
b. Shales with numerous bryozoa and brachiopods_____________ 3 
a. Massive crinoidal limestone with Camarocrinus_____________ 4 
Silurian. 
Decatur limestone. Massive crinoidal limestone, gray, magnesian in 
upper part and more yellow in lower portion________________-=____ 63 
Lobelville formation. 
Coral zone wanting. 
Bryozoan zone. 
Light bluesott : shales: suc 5s eee a ee as ieee eae 2 
Wihite sar oil Ta CEOS Hale SEO Te epee 2 
