140 INDEX TO THE STRATIGRAPHY OF NORTH AMERICA. 



the transition beds between the Upper Cambrian (Olenian) and the Middle Cambrian (Para- 

 doxidian) are concealed by the drift at the head of the cove. West of the cove the fissile and 

 arenaceous shales of the Upper Cambrian are weU exposed and contain Olenus. On the eastern 

 side of Broad Cove the Middle Cambrian is exposed. The measured section begins with the. 

 dark argillaceous shales and is as follows: 



Middle Cambrian, downward: Feet. 



la. Dark argillaceous shales, with fragments of Paradoxides in the upper portion. At 45 

 feet down the Paradoxides are abundant; also Acrothele, Obolus (L.) ferrugineus, 

 Ptychoparia, etc. At 110 feet down a 4-inch band of pinkish limestone carrying 

 fragments of trilobites occurs. A roll in the strata comes in at this point and con- 

 tinues for a considerable distance along the shore. It starts between the two east 

 wharves at Broad Cove and extends some distance east of the eastern point of Broad 

 Cove : 110 



lb. Below the limestone greenish shale extends downward to a layer of reddish argillaceous 



shale 20 feet in thickness. No recognizable fossils were found in this bed 80 



Ic. Pinkish nodular limestone in several layers, interbedded in reddish shale. Fossils: 



Paradoxides (undet.), Ptychoparia 4 



Id. Reddish-purple argillaceous shales with interbedded greenish-colored bands 135 



This band of shales corresponds stratigraphically to the Protolenus zone of the Hanford 

 Brook section of New Brunswick. A basalt dike cuts through the shales a few feet 

 above their base. On the weathered surface it has the appearance of a massive sand- 

 stone. It is 3 feet 4 inches in thickness, is vertical, and the dip of its cleavage planes 

 is almost coincident with the dip of the shales. 



le. Nodular limestones. A pinkish layer 4 inches thick contains at base numerous frag- 

 ments of trilobites and appears to be made up of a conglomerate formed of fragments 

 of pinkish-colored limestone and purple shale, and dark iron- or manganese-stained 

 nodules resembling a stromatoporoid-like growth, and a few small quartz pebbles. ... 3 



The entire stratum i3 as follows : 



Inches. 



Dark nodular limestone 25 



Purplish-colored shale 2 



Pinkish limestone 2 



Brick-red shale 3 



Pinkish conglomerate (?) limestone 4 



At the point of exposure on the shore this band is faulted down 15 feet to the west. It 

 is exposed near the top of the bank on the eastern side of the fault, where its dip is 

 lower than on the western side. 

 The stratum le is taken as the base of the Middle Cambrian (Paradoxidian). It is the 

 horizon indicated by Mr. Matthew in his diagrammatic section as the base of the Cam- 

 brian, and corresponds in stratigraphic position to the St. John quartzite of the New 

 Brunswick Cambrian. 

 ^ One observes no difference, in either strike or dip, between the shales beneath this band 



of nodular limestone and conglomerate and the shales above it until one passes to the 

 east of the fault line that cuts through and breaks the band a few feet above the water's 

 edge. 

 Lower Cambrian (Etcheminian of Matthew) : 



2a. Reddish-purple argillaceous shale with greenish shales in bands at irregular intervals 



and a massive band of greenish shale near the base . Dip near base 20° to 23 ° W 284 



At 110 feet from the summit fragments of a large undetermined trilobite were noted. 

 On the south side of Smith Sound, at Britannia Cove, Olenellus (H.) broggeri occurs 

 at a horizon corresponding to 140 feet below the summit of the stratum. 

 Near the base of 2a the following fossils were found: 

 Obolella atlantica. 

 Hyolithes sp. 

 Orthotheca sp. 

 Microdiscus sp. undet. 

 Olenellus (Hohnia) broggeri. 

 Solenopleura? bombifrons?. 

 2b. Greenish-colored arenaceous limestone, passing into an intraformational conglomerate 

 formed of nodules of pinkish limestone mixed with fine sand and carrying numbers 



of fragments of trilobites Ij. 



Pinkish-colored nodular limestones 2 



Fossils: Fragments of trilobites and a small brachiopod. 



