PREVIOUS INVESTIGATIONS 355 



Professor Kerr* makes no special mention of this individual area in 

 his report on the geology of North Carolina, but in denning the " Huro- 

 nian " rocks of the state he groups the area as the northernmost limit of 

 a belt of Huronian rocks traversing the state in a northeast-southwest 

 direction. Speaking in a general way of the rocks composing the 

 Huronian belt, Kerr mentions the following types : " Quartzite, clay 

 slates, gray, light-colored and drab and greenish." "At some points the 

 quartzites are argillaceous, and at others a few miles west of Smithfield 

 it approaches a fine conglomerate. The clay slates are occasionally 

 slightky h}^dro-micaceous." He mentions dikes of diabase and dolerite 

 as being common over parts of Granville county. Professor Kerr refers 

 the rocks of certain parts of Granville an* Person counties to the lower 

 Laurentian. He mentions the " characteristic and prevalent rocks as 

 being syenite, dolerite, greenstone, amphibolite, granite, porphyry and 

 trachite." 



In a geological map of North Carolina, accompanying a report by Kerr 

 and Hanna in 1887, the Person-Granville county area is grouped as 

 the northernmost part of the Huronian.f A section given at the bottom 

 of the map, extending from the Tennessee line to Newberne, North Caro- 

 lina, designates the rocks of the copper belt area as " Huronian slates." 



Mr Hanna X describes the copper belt in Person and Granville counties 

 in detail from the standpoint of economic mineralogy. He designates 

 the rocks as schists and slates, and regards them as decidedly chloritic 

 rather than argillaceous, as described by Emmons. Hanna gives the fol- 

 lowing quotation from a report by Doctor Jackson : 



" The strata are occasionally disrupted by dikes ; about half a mile from the 

 Gillis, and dipping eastward to it, is a dike bearing N. 20 E., containing abundant 

 sprigs and grains of disseminated native copper. Epidote occurs both in the trap 

 rock and in the quartz, and in the slate strata near the dike, which seems to indi- 

 cate that the trappean rock is of the same geological age as the quartz veins." 



Mr Lewis § describes areas of medium fine and compact grain biotite 

 granites, occurring immediately to the east of the copper belt proper, in 

 Granville and adjoining eastern counties. 



In his description of the iron ore deposits in the northwestern part 

 of Granville county, Mr Nitze || makes the following reference to the 

 rocks: "Geologically they [iron ores] occur in the crystalline slates 



* Geology of North Carolina, 1875, vol. i, pp. 123, 124, and 131. 



f Map accompanying "Ores of North Carolina," 1888. 



J Ores of North Carolina, 1888, p. 215. 



I Notes on Building and Ornamental Stones, First Biennial Report, N. C Geol. Survey, 1893, 

 p. 75. 



i| Iron Ores of North Carolina, N. C. Geol. Survey, Bulletin no. 1, 1893, p. 47; Engineering and 

 Mining Journal, 1S92, vol, 53, p, 447. 



