STATE GEOLOGIST. 9 



aula bordering on Lakes Michigan and Huron, followed by a 

 notice of the " Clay, Iron Stone and Bog Ores" of the Southern 

 Peninsula. The rocks of the Upper Peninsula are here ar- 

 ranged under the two heads Primary and Sedimentary. The 

 latter are subdivided into Lower Limeroch and Shales, and 

 Upper Limerocks. 



2. Topography, by S. W. Higgins, 18 pp. 



3. Geology, by C. C. Douglass, 23 pp., containing " General 

 Remarks on the counties of Jackson, Calhoun, Kalamazoo, 

 Baton, Ionia and Kent," with considerable detail on the rocks 

 of the coal measures, which are divided into "Upper" and 

 "Lower Coal Groups" 



4. Geology, by B. Hubbard, 35 pp. containing reports on Len- 

 awee, Hillsdale, Branch, St. Joseph, Cass, Berrien, Washtenaw, 

 Oakland and Livingston Counties, and embracing a systematic 

 description of the various formations and economical products 

 of these Counties ; a notice of the "Ancient Lake Ridge," and 

 numerous practical suggestions on the use of Peat and Marl. 



A Committee of the House of Representatives reported on the 

 reports of the State Geologist, at this session of the Legislature,* 

 and the Zoological and Botanical portions of the act establishing 

 the Survey were repealed. On the 28th of March, an act was 

 passed relative to the maps of the State and Counties. 



The Fourth Annual Report of the State Geologist was pre- 

 sented February 1, 1841. This Report embraced the following 

 documents : 



1. Geology, by Dr. Houghton, 89 pp. This was devoted to a 

 description of the Topography, Geology and Minerology of the 

 country bordering on Lake Superior. The classification of the 

 rocks will be embraced in the table which follows. The report 

 embraces a masterly discussion of the Mineral Veins of the 

 "Trap, Conglomerate, &c," and concludes with notices of the 

 "Purs, Fish and Harbors of Lake Superior." 



2. Latitudes and Magnetic Variations, by Frederick Hubbard, 

 Special Assistant, 6 pp. 



•House Doc. 1844, Vol. U. p. 155. 



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