7C3 



GEOLOGICAL SURVEY OP WISCONSIN. 



Laphara, Chas., 106. 



S. G., 3, 470. 

 Lapham's Peak, 213. 

 Lathrop, Rev. S. K., 93. 

 Latitude and Longitude, 61. 

 Laumonite, 29. 

 Laiirentian, 465. 

 Law of Survey, 5. 

 La Valle, Potsdam sandstone, 532. 

 Lead, Carbonate, 29. 



Ore, statistics, 743. 



Region, 689. 

 Lead Region, report on, 643. 



Introductory and historical, 645. 



Elevations, 650. 



Topog;raphy, 652. 



Drainage, 652. 



Springs and wells, 658. 



Prairie and forest, 660. 



Moands, 661. 



Soil and subsoil, 663. 



Peat, 664. 



Brick clay, 665. 



Glacial drift, 665. 



Geological formations, 668. 



Potsdam sandstone, 668. 



Lower Magnesiau limestone, 671. 



St. Peters sandstone, 675. 



Trenton (Blue and Buff) limestone, 680, 



Galena limestone, 683. 



Cincinnati group, 685. 



The Lead Region, 689. 



Mining terms defined, 689. 



Mineralogy, 691. 



Present condition of mines, 695. 



Beetown district, 695, 744. 



Potosi district, 699, 745. 



Fairplay district, 701. 



Hazel Green district, 704. 



New Diggings district, 710, 746. 



ShuUsburg district, 713, 747. 



Benton district, 717. 



PlatteviHe district, 719, 744. 



Mitain district, 721. 



Centerville district, 722. 



Highland district, 723, 749. 



Linden district, 726. 



DodgevUle, 730, 748. 



Mineral Point district, 733, 747. 



Calamine district, 739. 



Wiota district, 740. 



Monroe district, 740. 



Copper in Lead Region, 741. 



Statistics of zinc ore, 742. 

 of lead ore, 744. 



Concluding remarks, 751. 

 Leadhillite, 29. 

 Lebanon, 317. 

 Ledge, The, 318. 



Leedjs, Lower Magnesian limestone in, 547. 

 Lemonweir river, 418. 

 Lesser, 281. 

 Lewiston, 444. 

 Life. See Fossils. 

 Lima, 116. 

 Lime, 284, 305, 808, 841, 847, 880, 882, 



554. 



Limestone, Mendota, 260, 535, 542. 



Lower Magnesian, 268, 547, 671. 



Trenton, 290, 558, 680. 



Galena, 305, 562, 683. 



Niagara, 335, 686. 



Lower Helderberg, 390. 



Hamilton, 395. 

 Limonite, 28. 

 Lincoln, 116. 

 Lindina, 568. 



Linden IDistrict, mining, 726. 

 Linear topography, 612, 626. 

 Linn, 116, 213. 

 Lisbon, 259, 367. 

 Lithographic stone, 348. 

 Lithography, microsoopioal, 637. 

 liithological characteBS, given under 



each formation. 

 Little Green Lake, 273. 

 Little river, 134. 



Little Sturgeon Bay, Cincinnati shales, 

 314, 319. 



Iron ore near, 334. 



Niagara limestone, 344. 

 Little Snamico, 116. 

 Lode, 690. 



Logan, Sir W. E., 81. 

 Lodi, 586. 



elevations-, 442. 



Potsdam sandstone in, 544. 



Lower Magnesiau limestone, 547. 

 Lomira, 135. 

 Long Lake, 140. 



Lower Helderberg limestone, 890. 

 Lower Magnesian limestone. 



Eastern "Wisconsin, 268. 



Central Wisconsin, 547. 



Lead Region, 671. 

 Lowell, elevations, 116, 170. 



Trenton limestone in, 301. 

 Lowville, elevations, 443. 



Lower Magnesian limestone in, 647. 

 Lucas Point, 260. 

 Lynden, 117, 223. 

 Lyndon, 570. 

 Lyons, 117. 



M. 



Macadamizing, 394. 



Mackford, Lower Magnesian in, 272. 



Trenton limestone in, 301. 

 Madison, 532, 533, 543, 604. 



Elevations, 437. 



Sandstone, 260, 535, 642. 

 Magnesian limestone. (See Limestone.) 



Lower, in Central Wisconsin, 547. 

 Eastern Wisconsin, 268 

 Lead Region, 671. 

 Magnetic irou sand, 239. 

 Magnetite, 21, 222, 239, 493, 520. 

 Magnolia, elevations, 117, 169. 



St. Peters sandstone in, 289. 



Trenton limestone in, 289. 

 Malachite, 29, 694. 

 Manganese, 28, 693. 



