96 J. J3. TYEEELL ON THEEE 



1390-1395. Similar sliale, with a few crystals of selenite. 

 1400-1405. Similar shale, without seleuite. 



No. 14. — This series is a downward coutinuation of the last, the shale gradually 

 becoming more calcareous, till it appears to terminate in a band of coarse fragmentai lime- 

 stone, called sandstone by the driller. From this limestone band there was a considerable 

 flow of water which rose rapidly in the pipe to within eight feet of the top. The water 

 had a flattish taste from the presence of salts of soda. This limestone band is regarded 

 as the base of the Niobrara formation. The following is a serial description of the beds : — 



1410. Dark grey non-calcareous clay shale, with a few rotaline foramiuifera, and some 



moderately large fragments of the shell of Inoceramus. 

 1415-1425. Similar shale, with a few fragments offish remains, but no foramiuifera. 

 1430-1445. Similar shale, with a few prisms of Inoceramus. 

 1450. Lighter grey calcareous clay shale, with large and small prisms of the shells of 



Inoceramus, pieces of shells of Ostrea, and a few fragmentary fish remains. 

 1455. Similar shale, with a large number of foramiuifera, Globigerina crelacea being 



especially abundant. 

 1460-1485. — Similar shale, with a few Inoceramus prisms, and a greater or less number 



of small foramiuifera belonging to such genera as Textularia, Auomalina, etc. 

 1490-1510. A light-grey calcareous shale, with numerous specks of pyrite, many small 



species of foramiuifera, prisms of Inoceramus, and pieces of the pearly shell of 



Ostrea, and fish remains. 

 1515-1555. A harder grey calcareous shale, holding similar organic remains, in varying 



quantities. 

 1565. Dark grey slightly calcareous thin-bedded shale, holding a few foramiuifera, and 



fragments of fish remains. 

 1570. Dark grey non-calcareous thin-bedded shale, without organic remains. 

 15'75. Dark grey clay shale, with many fragments of the shells of Inoceramus. With these 



are a few species of foramiuifera of such genera as Textularia, Auomalina, etc., 



with fragmentary fish remains, and moderately large masses of pyrite. This 



gritty or fragmentai layer formed the sandstone of the driller, and from it quite 



a large supply of water rose in the tube. 

 1580-1590. Dark grey clay shale, with a few corroded prisms of Inoceramus, small 



foramiuifera, and fragments of fish remains. When the drillings are washed 



almost all is carried away in the water as a fine miid. The latter specimen, when 



drying, became covered with a white etHorescence of sulphate of soda ? 

 1595. Similar shale, breaking down into thin flakes, and containing small cubical crystals 



of pyrite, prisms of Inoceramus, fragments of fish remains, and pieces of the shell 



of Ostrea, but no recognizable foramiuifera. 



No. 15. — Consists throughout, as far as could be determined] from the specimens, of a 

 dark-grey, non-calcareous clay shale. In its upper portion it is apparently very bitum- 

 inous, and breaks into minute flakes, while below it is somewhat lighter in colour, does 

 not break into thin flakes, and contains minute angular grains of clear quartz sand. 



The following is a somewhat more detailed categorical description of the beds passed 

 through : — 



