16 THE MARQUETTE IRON-BEAEIXG DISTRICT. 



Cliiiiiniiig, who has given us a synopsis of tlie geoh^gical resvilts reached 

 by Locke's party. 



After referring to the point of Presque Isle as consisting of "ti-ap much 

 modiiied l)y the neighboring sandstone, with wliich it has a junction a 

 short distance inhmd," and to the character of the ores ("sulphuret of 

 copper and iron") mined there, Chainiing briefly outlines the results of a 

 trip made inland from the Carp River "through the metamorphic region 

 and the iron region to the syenite on the Escauawby River," as follows: 



On Carp River the principal rocks are the metamorphic slates and sandstone 

 quartz. In the former, in T. 48, R. 2G, two veins of quartz were observed contain- 

 ing copper pyrites. * * * In sec. 30, T. 48, R. 26, a quarry of horustone occurs, 

 adjoining the quartz, which furnishes oilstones of the finest quality. 



The location of the Jackson Iron Company is in R. 27, T. 47, sec. 1. The iron 

 region, which has its northern limit here, was observed for many miles. It consists of 

 magnetic and iinmagnetic oxides of iron, occasionally associated with metamorphic 

 slate or chlorite slate. * * * 



South of the metamorphic region the slates and sandstone quartz gradually 

 pass into quartz and feldspar rock and fine-grained sj^enite. 



Still farther south the coarse and porphyritic syenite on the Escauawby River 

 comes in. These rocks were rarely found to contain mica. 



The pitl)lished documents of the first session of the Thirtv-tirst Con- 

 gress (1849—50) contain the reports of the linear surve^'ors, those of Dr. 

 Jackson and his assistants, and of Messrs. Foster and Whitney, who suc- 

 ceeded Jackson as United States geologists. Although all these bear the 

 same date of publication, the reports of the linear surveyors had been 

 submitted to the authorities several years before their publication, even 

 l)efore the date of publication of Locke's first report already referred to, 

 and copies of them had evidently been furnished to Jackson and to Foster 

 and Whitney before they entered upon their surveys; so that the reports 

 bearing date of 1849-50 must not be looked upon as contemporaneous. 

 The work of the linear surveyors was prior to that of Jackson and his 

 assistants, while the work of Foster and Whitney was undertaken, at least 

 in part, after Jackson's work. The value and importance of the difierent 

 reports published in this year must be judged in the light of this knowledge. 



The Chippewa land district was subdivided into townships and sec- 

 tions by William A. Burt, Bela Hubbard, and others, under the direction 



