GEOLOGICAL SURVEY OF WISCONSIN. 



Lapham, Chas., 106. 



S. G., 3, 470. 

 Lapham's Peak, 213. 

 Lathrop, Rev. S. E., 93. 

 Latitude and Longitude, 61. 

 Laumonite, 29. 

 Lanrentian, 465. 

 Law of Survey, 5. 

 La Valle, Potsdam sandstone, 532. 

 Lead, Carbonate, 29. 



Ore, statistics, 743. 



Reg-ion, 689. 

 Lead Region, report on, 643. 



Introductory and historical, 645. 



Elevations, 650. 



Topography, 652. 



Drainage, 652. 



Springs and wells, 658. 



Prairie and forest, 660. 



Mounds, 661. _ 



Soil and subsoil, 663. 



Peat, 664. 



Brick clav, 665. 



Glacial drift, 665. 



Geological formations, 668. 



Potsdam sandstone, 668. 



Lower Magnesian 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. 



Shullsburg district, 713, 747. 



Benton district, 717. 



Platteville district, 719, 744. 



Mifflin district, 721. 



Centerville district, 722. 



Highland district, 723, 749. 



Linden district, 726. 



Dodgeville, 730, 748. 



Mineral Point district, 733, 747. 



Calainine 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. 



Leeds, Lower Magnesian limestone in, 547. 

 Lemonweir river, 418. 

 Lesser, 281. 

 Lewiston, 444. 

 Life. See Fossils. 

 Lima, 116. 

 Lime, 284, 305, 308, 341, 347, 380, 382, 



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 District, mining, 726. 

 Linear topography. 612, 626. 

 Linn, 116, 213. 

 Lisbon, 259, 367. 

 Lithographic stone, 348. 

 Lithography, microscopical, 637. 

 Lithological characters, 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 AV. E., 81. 

 Lodi, 586. 



elevations-, 442. 



Potsdam sandstone in, 544. 



Lower Magnesian limestone, 547. 

 Lomira, 135. 

 Long Lake, 140. 



Lower Helderberg limestone, 390. 

 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, 547. 

 Lucas Point, 260. 

 Lynden, 117, 223. 

 Lyndon. 570. 

 Lyons, il7. 



M. 



Macadamizing, 394. 



Mackford, Lower Magnesian in, 272. 



Trenton limestone in, 301. 

 Madison, 532, 533, 543, 604. 



Elevations, 437. 



Sandstone, 260, 53-5, 542. 

 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. 



