18 CRETACEOUS GROUP 



traversed by iron crusts, and containing large masses 

 of primitive rocks. Depth 35 \ feet. 



2. Argillo-micaceous sand, of a dark blue color. Or- 

 ganic remains few and indeterminate. Depth 28f 

 feet. 



3. Argillo- ferruginous sand, of ^a greenish color, 

 abounding in Ammonites, Baculites, Pholadomyae, 

 Lignite, Succinite &c. Depth, 4 feet. 



4. Coarse gray sand, with similar organic products as 

 No. 3. Depth 7 feet. This stratum forms the bottom 

 of the canal, but the excavation was made six feet 

 deeper for experimental purposes. 



5. Argillaceous sand, of a dull green color, which it 

 imparts to water. Organic remains same as in the 

 last beds. Depth 3 feet. 



6. Coarse gray sand, which was penetrated about three 

 feet, but no fossils were observed. 



Section, No. 2. PL 14, lower figure. Taken 484 

 yards west of section No. 1. Vertical depth 62 J feet. 



1. Ferruginous gravel and sand. Diluvial. Depth 9 

 feet. 



2. Black tenaceous clay. Depth 7 feet. 



3. Ferruginous brown sand and clay, containing a pro- 

 fusion of Ammonites and Baculites, with Scaphites, 

 Lignite, Succinite, and casts of various simple uni- 

 valve and bivalve shells. Depth 23 feet. 



4. Blue micaceous sand and clay, with similar fossils to 

 No. 3. 



5. Ferruginous sand and clay, of a dull green color, 



