30-i T. H. Aldrich — Tertiary of Alabama. 



River, we measured the Buhr-stone with the aneroid, making 

 it 270 feet thick from our camp on top of the hill to the 

 river. Dr. Smith's observations at other points indicate at 

 least 70 feet more to go on top of this, giving at least 340 feet 

 of thickness. 



All the fossils found in the Buhr-stone were Claibornian in 

 specific character ; I mention Venericardia parva Lea, T. obruta 

 Con., V. rotunda Lea and Corbula ilfurchisoni Lea. 



Continuing our section downward we find at White Bluff on 

 east bank of the Tombigbee River, the following, viz: at top. 



(1) Hard Buhr-stone, vertical bluff 90-100 feet. 



(2) Clays 30 feet. 



(3) Clay with lignite stems distributed throughout .. 3' 0" 



(4) Clay '. 5' 0* 



(5 ) Lignite in fine streaks 0' 6" 



(6) Barren clays 100' 0" 



Coming up the river toward Wood's bluff, we find, rising 

 from under this exposure : 



(7) Clays, some layers very sandy. Found one speci- 

 men of Athleta Tuomeyi Con. here 50' 0" 



(8) A thin streak of fossiliferous sand containing 

 Wood's bluff fossils 0' 2" 



(9) Clays, barren 12' 0" 



(10) 2-4 feet Green sand, brown outside, dark green 

 when freshly cut, fossiliferous, Lcevibuccinum lineatum 

 Heilpr., seems confined to this bed . 4' 0" 



(11) Clay, dark grayish-blue, containing Athleta Tuo- 

 meyi Con., abundant 8' 0" 



(12) Indurated greensand 2'-3' 0" 



(13) Greensand marl (fine fossils here) 3' 



(14) Indurated Greensand marl crowded with shells, 



large proportion Turritellas 6' 8" 



(15) Indurated Greensand marl ledge making a shoal in 



the river, showing 5' 0" 



Nos. 12, 13, 14 and 15 really form one marl bed, the distinc- 

 tions are mainly in hardness and in being more or less fossil- 

 iferous. This group (Wood's bluff) is very extensive, and can 

 be traced easily to the western border of the State. We found 

 it at Butler, Choctaw Co. Professor Heilprin has described 

 most of the species found here.* 



It is unnecessary to continue this series farther to prove the 

 object in view; but nearly every bed down to the Cretaceous 

 has been examined without revealing the Jackson or Vicks- 

 burg groups. 



Dr. E. A. Smith and Dr. Lawrence Johnson have made sec- 



*P. A. N. S., 1880, p. 364. 



