

366 THE CAMBRIAN. [bull. 81. 



Section 3. Vicinity of North Attlebarough and Brain tree, Massachusetts. — In this 

 section the Lower Cambrian series of North Attleborongh aud the Middle Cambrian 

 of Braiutree are united in one generalized section. The basal series is unconforuiably 

 superjacent to the Archean. 



Appalachian Province: 



Section 4. Xurth side of the Straits of Belle Isle, Labrador. — The base rests uncon- 

 foruiably upon the Archean. 



Section 5. Central western Newfoundland. — The base rests uncoufoimably upon the 

 Archean, but the summit of this section is not clearly defined owing to lack of data 

 to determine the range of the fauna. 



Section 6. Franklin County, Vermont. — This represents the " Red sandrock " series, 

 with its superjacent Georgia shales, in the township of Georgia. The base is cut off 

 by a fault line, and the exact limitation at the summit is uukuown. 



Section 7. This represents the great shale and slate section of Washington County, 

 New York. It is cutoff at the base by a fault line and the summit is not well defined. 



Section 8. The shore-line deposits of the Green Mountains or the "Granular 

 Quartz," above which come limestones in which Cambrian fossils have been found. 

 At the base it rests uncouformably upon the crystalline pre-Cambrian rocks. 



Section 9. Typical section in southern Pennsylvania, showing the "Granular 

 Quartz" resting uncouformably upou the subjacent crystalline rocks and extending 

 above into the shale series beneath the limestones. 



Section 10. This section is that of central Virginia, not far away from the shore 

 line. The base rests unconforuiably upon the pre-Cambrian rocks, and above it passes 

 into the base of the " valley '' limestones. 



Section 11. Bogersville h East Tennessee. — The base of this section is cut off by a 

 fault line and above it passes into the Knox dolomite, the lower beds of which carry 

 the Upper Cambrian fauna. The Chillmwee Mountain section conies beneath the 

 Rogersville, and it is so represented in this section. An interrogation point inark a 

 the hiatus between the two sections. The data for this sectiou are gi \vu by Mr. Bailey 

 Willis, chief of the Appalachian division of geology, U.S. Geological Survey. 



Section 12. The line of this section extends from Rome, Georgia, westward into 

 Alabama. At the base it is cut off by a fault and above is delimited by the Knox 

 dolomite. The data for it are given by Mr. C. Willard Hayes, of the Appalachian 

 division of the U. S. Geological Survey. 



Section 13. Western slope of the Wasatch mountains, Utah. — In this section the 

 12,000 feet of quartziteaud siliceous slates are tentatively referred to the Cambrian. 

 The fossiliferons zone is confined to the upper 250 feet. 



Section 14. Central eastern Nevada. — This section represents the great quartzite 

 series beneath the fossiliferons Cambrian limestone. The base has been concealed, 

 and the summit has beeu removed by erosion. 



n«>N 15. Eureka District, Nevada. — In this section the fossiliferons Lower Cam- 

 brian strata rests conformably upon the quartzites, which pass down some 1,500 feet 

 before being concealed. The quartzites may correspond to the upper beds of section 

 14. The summit of the section passes into the superjacent Pogonip limestone of the 

 Silurian (Ordovician). 



Section 16. Gallatin River near Gallatin City, Montana. — This is essentially the 

 same as the Mount Stephen section of British Columbia (section 17). The subjacent 

 series of quartzites and silieeou are tentatively included iu the Cambrian. 



Section 17. Mount Stephen section of British Columbia, in connection with the 

 subjacent Bow River quartzite and silieeous slates. The relations of the section are 

 the same as those of the Eureka section (15) of central Nevada, with the addition of 

 the Bow River quartzite aud slates. 

 Rocky Mountain Province: 



Central Interior Continental subproviuce: 



Section IS. The western section of the central Interior Continental Province as 

 it occurs in Minnesota, 



