CAMBRIAN AND LOWER ORDOVICIAN. 143 



Seely Street section. — ^The section exposed at the head of Seely Street, beside the Park 

 Road, is as follows. The pre-Cambrian Algonkian rocks have an uneven surface where the 

 basal beds of the Cambrian rest against them. 



Lower Cambrian , upward : Feet, 



la. Dark reddish-brown fine conglomerate and sandstone, with reddish and green, hard 

 arenaceous shale. The conglomerate contains small quartz pebbles and bits of the 



subjacent Algonkian siliceous beds. Strike N. 40° [E.] mag., dip 70° SE 12 



lb. Space concealed. From the abundant debris in the soil as exposed in a cutting 

 beside the road the section here is formed of reddish-purple and green sandy 



shales 85 



Ic. Reddish-purple and greenish arenaceo-micaceous shales and thin-bedded sandstone.. 52 

 Middle Cambrian: 



2a. Light-gray fine-grained quartzitic sandstone in thick layers. The grains of sand 

 become coarser in the upper part of section and a layer of white quartz-pebble con- 

 glomerate occurs near the summit. Strike at base N. 55° E. mag., dip 70° SE 40-45 



2b. Arenaceous and argillaceous greenish-colored shales and thin-bedded sandstones, 

 passing above into dark argillaceous shales. About 25 feet above the base Jhe Para- 

 doxides fauna appears in great abundance. For further details of the section of the 

 St. John Cambrian rocks see Mr. Matthew's papers. 



It will be noted that the strike of the basal Lower Cambrian bed la is N. 40°, while that 

 of the St. John quartzite is N. 55° E. This does not indicate an unconformity as the change 

 of strike occurs in the beds below; the shales just beneath the quartzite are conformable to 

 the quartzite. 



Hanford Brook section, St. John County, New Brunswiclc. — ^The Middle Cambrian portion 

 of the Hanford Brook section as exposed at McAfee's sawmill on the south bank of the brook 

 below the mill is as follows: 



Middle Cambrian downward: Feet, 



la. Greenish-colored argillaceous shales with abundant remains of Paradoxides and other 



forms of the Paradoxides fauna 30-f 



Ib. Massive calcareo-argillaceous layer carrying the Paradoxides lamellalus fauna. Strike E. 



and W., dip 45° N 3 



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. 

 2b. Greenish argillaceous shale with a layer of sandstone 8 inches thick, and a little below, 

 another layer of sandstone 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 argillitea in layers 10 to 20 inches in thickness, that 



break up on exposure into irregular shaly layers. Strike E. and W., dip 25° N 16 



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 numerous 

 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 bl of Matthew. 

 3. Light-gray to white quartzitic sandstone in massive layers, the upper portion passing into 



greenish-tinted quartzitic 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° NW. 



Lower Cambrian downward: Feet. 



la. 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 calcareous nodules appear in the shales 320 



Strike in upper beds, N. 60° E., dip 20° NW. In beds 215 feet below sunmiit, strike 

 N. 70° E., dip averaging 20°-25° NW. 



