GEOLOGICAIi EXPLORATIONS AND LITERATURE. 15 



Whitney (J. D.). Diary iu same report with that of Mr. Barnes just referred to. 

 Ill Wliituey's diary of field work (pp. 738-74U) au account is given of 

 the journey made by liiin iu company with Mr. Barnes. His course of 

 travel has already been given and mapped, Fig. 1. The observations made 

 on three lines of travel by Barnes and Whitney in the country between 

 Gogebic lake and the Moutreal river are all the Ijasis for any state- 

 ments with regard to this region made by Jackson and by Foster and 

 Whitney in their respective reports. All later published statements with 

 regard to the geology of this region, up to the time of the rapid trip made 

 by Brooks and Pumpelly in 1871, depend also upon these few observa- 

 tions by Whitney and Barnes. It is interesting to note that although these 

 gentlemen found nothing in the region but granite and greenstone, they 

 must have passed on at least two of these lines within a short distance of 

 large exposures of slate and jasjiery iron ore. 



FosTEit (J. W.) and Whitney (J. D.). Synopsis of Explorations of the Geolog- 

 ical Corps in the Lake Superior Land District in the Northern Peninsula of Michigan, 

 Senate Docs., l.st sess., 31st Cong., 1849-50, vol. iii. No. 1, Pt. iii, pp. C)0~>~(i2C). 



This is the first report made by Messrs. Foster and Whitney after they 

 had superseded Dr. Jackson in the control of the Geological Survey of the 

 Mineral Lands of the United States in Michigan. In it are embraced the 

 results of work done by these gentlemen in the capacity of assistants to 

 Dr. Jackson. Among other results thus obtained were those by Whitney 

 and Barnes in the summer of 1847, in the country west of lake Gogebic. 

 It appears evident that no further work was done in that district for this 

 report, or for their final report below noticed, by either of these gentlemen 

 or by any of their assistants. 



Accoiuiiaiiying this report are several geological maps, one of which, 

 entitled "The District between Portage Lake and Montreal River," drawn 

 on a scale of 3^ miles to the inch, includes that portion of the district which 

 forms the subject of the present volume as far west as the Montreal river. 

 This is the map referred to above in connection with Whitney's letter of 

 1847 to Dr. Jackson. 



