walcott] SUMMARY NEWFOUNDLAND. 255 



coast nearly 200 miles, to Bonne Bay, a more extended section of Cam- 

 brian strata is met with that is described in detail, as follows i 1 



Between 1 and 2 miles inland from bhe northeast side of the east arm of Bonne 

 Bay there arises a rauge of hills of Laureutiau gneiss, 2,000 or 3,000 feet in height, 

 on the flank of which is exposed the folio w ing measured section : 



A. 



Feet. 



Blackish blue, fine-grained slate, with a cleavage independent of the bed- 

 ding. Of this slate only 105 feet of the upper part are seen ; the lower 

 part is concealed in the space between the upper portion and the gueiss, 

 and may eouvprise a thickness of about 230 feet 335 



Blackish blue slate interstratitied with gray quartzites, in beds of from 6 * 

 inches to 3 and 4 feet. In the 80 feet at the bottom the quartzites 

 greatly predominate, and they constitute 15 feet at the top, while the in- 

 termediate 175 feet consist chiefly of slate 270 



605 



B. 



1. Light gray, yellow- weathering limestone, in beds of from 1 to 3 inches thick, 

 interstratiued with blackish-blue, slightly calcareous slate, both contain- 

 ing small specks of silver-white mica, which are more abundant in the 



limestone than in the slate. The limestones hold in abundance fragments 

 of trilobites, chiefly belonging to three or four species. Among them is 

 Paradoxides (Olenellus) vermontana, a new species of Bathyurus, and the* 

 pygidium of a species so closely resembling B. extans of the Birdseye and 

 Black River formation, that it can scarcely be distinguished from it and 

 may possibly be the same 80 



2. Grayish green, micaceo-arenaceous shale, interstratitied with a few beds of 



grayish quartzite weathering slightly yellow 80 



3. Strata concealed 30 



4. Reddish granular quartzite in thick beds, with numerous parallel joints in 



two directions, dividing the beds into rhomboids 105 



5. Gray and grayish green, micaceo-arenaceous shale in beds from a quarter of 



an inch to an inch thick, interstratified with a few beds of gray, very fer- 

 ruginous, sandy dolomite, and fewer of gray quartzite 127 



6. Reddish quartzite, in beds of from 1 to 2 feet thick 34 



7. Gray arenaceous dolomite, weathering yellowish brown, interstratified with 



reddish quartzite in beds of from 1 inch to 1 foot thick, and with reddish 

 and grayish micaceo-arenaceous shale predominating toward the top. The 

 beds of dolomite and shale contain fossils, among which are Obolclla chro- 

 matica?, Obohifrlabradoricus, Paradoxides vermontana, Coucephalites, a new 

 species of Bathyurus, and one or more undetermined species of Salterella. 27 



483 



C. 



1. Whitish quartzite in beds of from 6 inches to 2 feet, interstratified with 

 light gray, micaceo-arenaceous shale, in layers of from 6 inches to 1 foot, 

 which occur at intervals of from 5 to 10 feet 150 



!Op. cit., pp. 865-867. 



