150 ANNALS NEW YORK ACADEMY OF SCIENCES 



below and the Brunswick above with the Lockatong might account for 

 the areas of transition. 



0. This part of the basin is underlain by dark-colored shales ; no argillites 

 appear. At the western end there is a heavy conglomerate, probably of 

 Brunswick age. 



-1. Reading Railroad tunnel section, PJicenixville. Feet 



Shale, dark red to black (top bed) 380 



Shale, brown 380 



Argillite, brown 250 



Shale, sandy, red and brown 



31ack shales with estheriae I 490 



.Shale, red and brown, transition beds (bottom bed) 



Total (no important faulting) 1500 



2. Schuylkill River section, Phcenixville. 



Shale and argillite, brown (top bed) 750 



Shale, black, with fish scales 50 



Argillite, brown 500 



Shale, dark colored, with estheriae 20 



Shale, dark red (bottom bed) 380 



Total (no faulting) 1700 



3. Perkiomen Railroad section. 



Shale, dark red (top bed) 750 



Argillite, brown 500 



Beds with estheriae 10 



Argillite, brown 330 



Shale, hard and red 330 



Shale, gray, with estheriae 10 



Shale, dark red (bottom bed) 200 



Probably no important faulting. ■ ■ 



Total 2140 



4. Gwynedd Valley section, Philadelphia and Reading Raih'oad. 



Shale, dark red (top bed) 720 



Argillite, brown 1000 



Shale, dark red (bottom bed) 1000 



10 per cent reduction made for faults. 



Total 2430 



5. Wycomhe section, Philadelphia and Reading Railroad. 



Shale, dark red (top bed) 670 



Limy layer with estheriae, scales and ostracods 1 



Argillite, gray and brown 1000 



Argillite, with magnesian limestone bands 50 



Shale, brown 600 



Shale, red 450 



