LOWER CAMBRIAN TERRANE 32 1 



Feet. 

 2a. Gray sandstone and greenish arenaceous and argillaceous 



shale 34 



Very few traces of fossils were found in this bed. It is 

 the horizon of fauna b4 and b5 of Matthew, 

 ab. Greenish argillaceous shale with a layer of sandstone 8 

 inches thick, and, a little below, another layer of sand- 

 stone 4 feet in thickness. The sandstones are very hard, 

 fine-grained, and with fossiliferous phosphatic nodules 



near the bottom 10 



Fossils : 



This horizon carries the Protolenus fauna, fauna b3 of 

 Matthew. 

 2c. Fine-grained, dark-gray, arenaceous argillites in layers 10 

 to 20 inches in thickness, that break up on exposure into 



irregular shalv layers 16 



Strike E. and W., dip 25° N. 

 Fossils : 



Protolenus fauna, b2 of Matthew. About midway of 

 the subdivision there is a layer of greenish-gray, fine- 

 grained sandstone 14 inches in thickness, in which 

 numei"ous small phosphatic nodules occur in the lower 

 3 inches, with many fragments of fossils. 

 2d. Dark-green to grayish-green, fine-grained, compact, hard 



sandstone 18 



Fossils : 



Fauna bi of Matthew. 

 3. Light-gray to white quartzitic sandstone in massive layers, 

 the upper portion passing into greenish-tinted quax'tzitic 

 sandstone 30 + 



The section from the quartzite downward for a distance of 

 nearly 300 feet on the surface is entirely concealed. The 

 highest beds of the subjacent Lower Cambrian are exposed at 

 the upper end of the mill pond, where they have a strike of N. 

 60^ E., dip 20° N. W. 



Lower Cambrian^ downward. — Feet. 



I a. Estimated thickness concealed beneath the ' St. John 



quartzite' ., 136 



lb. Massive-bedded, dark-purplish-colored arenaceous shales 

 and sandstones. Toward the lower portion a few cal- 

 careous nodules appear in the shales 320 



Strike in upper beds, N. 60° E., dip 20° N.W. In 

 beds 215 feet below summit, strike N. 70° E., dip 

 averaging 2o°-25° N.W. 



