602 D. W. LANGDON, JR. — CRETACEOUS AND TERTIARY STRATA. 



Feet. 

 22 — Gray fossiliferous marl, shells much decomposed. An occasional ligniyzed 



log and numerous slightly phosphatio nodular masses containing fossils 



occur in this stratum 5 



23 — About the same in general character as 21, but contains jndurated ledges 

 about a foot thick, which show the dip to average 40 feet to the mile, 

 with numerous rolls ; ends just above the mouth of Covvikee creek, Ala- 

 bama 170 



24 — Soft, less coherent sand, gray in color ; appears at the mouth of Cowikee 

 creek, Alabama, from which the southern bank of the creek, composed of 

 this stratum, may be seen to rise 50 feet from the water GO 



25 — Gray calcareous sand, with indurated ledges, containing Exogyra costata, 

 Say ; Gryphma mutahilis, Mort. ; Hamulus onyx, Plicatula urticosa, 

 Anomia, sp. ; forms the shoal at Frances bar and bluff at Eufaula, Ala- 

 bama 190 



26 — Light-gray and yellow sands, interlaminated with sand darker in color, 

 more argillaceous, and containing bits of lignitized leaves and twigs ; no 

 other fossils seen ; crops out in the gullies of Eufaula next below the 

 Orange sand 20 



27 — Massive gray sand, with a few fragile fossils and bowlders. This sand is 

 only slightly calcareous, and is more or less lignitic ; dip here about 100 

 feet to the mile 40 



28 — A more calcareous sand, filled with Exogyra costata, Say, and many indu- 

 rated ledges, giving rise to the first bar below Eufaula 70 



29 — Light-yellow cross-bedded sands enclosed between indurated ledges 20 



30 — Calcareous gray sands, with bowlders 50 



31 — Yellow sands and indurated ledges filled with casts, Exogyra costata, Say, 

 and echinoids set fast in the ledges. The sands are cross-bedded and con- 

 tain some lignitic streaks 35 



32 — Gray fossiliferous sand, with bowlders. The sand is massive, and is fossil- 

 bearing only in the lowest 5 feet 40 



33 — Brown laminated argillaceous sand; disappears at the mouth of Patau^a 



creek, Georgia. 



34 — Light-yellow sand, interstratified very irregularly with a gray micaceous 



sand filled with friable Ripley fossils ; mouth of Pataula creek, Georgia 30 



35 — Hard sandy ledge; weathered surface jagged; contains Exogyra costata, 

 Say, and echinoids ; very light yellow in color, white when dry and not 

 weathered 30 



36 — Gray sand, with indurated ledges ; no fossils seen ; merges gradually in the 

 upper part into a dark, almost black, sand containing large nodular 

 masses and interstratified with light-yellow sands 35 



37 — White coarse conglomerate, the matrix material being calcareous. The 

 quartzose pebbles decrease in size toward the top, and the stratum be- 

 comes more argillaceous. There are many casts, but all too obscure for 

 identification 18 



38 — Massive blue clay; contains a few bits of teredo-eaten lignite (probably 



top of Cretaceous) 6 



39 — Massive sandstone ; coarse-grained and almost a conglomerate 8 



40 — Light-yellow silicious limestone, containing a large Osti (ea and numerous 



obscure casts; five miles above Fort Gaines, Georgia 10 



V 



