2 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.71 



Section No. 2, about three-fourths mile heloio section No. 1 and one-third mile 

 above the site of tlw old Langley homestead. (PI. 1, B.) 



Pleistocene : Foot 



2. Rather stiff arenaceous clay, containing scattered pebbles. A 



layer of cobbles occupies a position 1 foot above tlie base 4 



Probable unconformity. 



?Miocene, St. Marys (?) formation: 



1. Light gray to ferruginous argillaceous sand containing the fol- 



lowing St. Marys forms, which are preserved as casts : 



TurrifeJia plcbeia Say, Naticaf, Cardium species, Tageliis? 



Spisulaf. Contains also the peculiar spiral and other forms 

 described in this paper. The face of the bluff is uneven, due 

 to protruding indurated sand 4 



Section No. 3, about half a mile below section No. 2 and one-third mile below 



the site of the old Langley homestead 

 Pleistocene : Feet 



4. Sand and gravel. A layer of cobbles occupies a position in the 



lower part 4 



Probable unconformity. 



?Miocene, St. Marys (?) formation: 



3. Unfossiliferous arenaceous clay l^t 



Miocene, St. Marys formation : 



2. Sand carrying entire and fragmental St. Marys shells 1% 



1. Bluish arenaceous clay carrying well-preserved St. Marys fossils__ 2V2 



In the above section the upper surface of bed No. 1 is somewhat irregular, 

 suggesting a slight unconformity ; however, no coarse sedimentary beds were 

 found at the contact between beds Nos. 1 and 2 and these beds may be 

 essentially conformable. 



Section No. 4, about one-third mile heloio section No. 3 



Pleistocene : Feet 



2. Dark clay, sand, and gravel. A layer of cobbles occupies a posi- 



tion near the middle of this bed 4 



Probable unconformity. 



?Miocene, St. Marys (?) formation: 



1. Alternating seams of gray arenaceous clay and ferruginous 



medium-grained sand. Contains casts of Pholasf inclosed in 

 a ferruginous matrix as well as the peculiar spiral, nearly 

 straight, and irregular forms. The sandy seams are indurated 

 and protrude from the face of the bluff 4 



Section No. 5, about two-thirds mile below sectimv No. 4 



Pleistocene : Feet 



2. Dark-colored clay, sand, and gravel. A layer of cobbles occupies 



a position about 1 foot above the base ^Vi 



Probable unconformity. 



?Miocene, St. Marys (?) formation: 



1. Alternating seams of gray argillaceous sand and ferruginous sand. 

 The face of the bluff is irregular, due to the indurated sandy 

 seams and cylindrical and oval indurated ferruginous concre- 

 tions. Contains casts of the genus Pholasf inclosed in a gray to 

 ferruginous seniiiudurated fine-grained argillaceous sand 4 



