. Geological report on Monroe County, Michigan. ECONOMIC PliOBUCTS. 199 water tastes aud smells of hydrogen sulphide and is depositingsulphur. Similar springs with mounds of tufa are found to thesouth, upon lands of Mrs. Adeline Q. Navarre and, Joseph Asam. A large sulphur spring occurs upon the place of Peter Cushino,Otter Creek, near the Sharkey well just described. This has anelliptical basin 45 by 90 feet, with a 10 foot margin richly coveredwith Chara. The stream from the spring is not rapid, is 2^ feetbroad and 10 inches deep. A similar but much larger spring occursin the Erie marsh near
. Geological report on Monroe County, Michigan. ECONOMIC PliOBUCTS. 199 water tastes aud smells of hydrogen sulphide and is depositingsulphur. Similar springs with mounds of tufa are found to thesouth, upon lands of Mrs. Adeline Q. Navarre and, Joseph Asam. A large sulphur spring occurs upon the place of Peter Cushino,Otter Creek, near the Sharkey well just described. This has anelliptical basin 45 by 90 feet, with a 10 foot margin richly coveredwith Chara. The stream from the spring is not rapid, is 2^ feetbroad and 10 inches deep. A similar but much larger spring occursin the Erie marsh near Vienna, N. E. ], Sec. 22. It is reached byboat by punting one-half mile through an artificial chaunel. At a. Fig. 8. Great sulphur spring in the lake marsh near Erie. The tigure gives also a view ofthe inundated margin; of. Fig. 5. distance the site of the spring is marked by a spot of the most lividgreen contrasting stiangely with the dark waters of the marsh. Thegeneral form of the spring is circular as shown in Fig. 8 and itsdiameter is about IGO feet. The bottom is funnel-shaped, a marginalstrip of 25 to 40 feet shelving off slowly and then making a suddendrop. The bottom where visible through the clear water is coveredwith a mat of Cham, encrusted with a deposit of sulphur. Thesounding line struck bottom at 30 to 33 feet, although it is quiteprobable that fissures occur leading to greater depths. The outletfrom the spring is a small sized river having considerable velocity, abreadth of 33 feet aud a depth of one to two feet. The current isso swift that there is some difficulty experienced in entering the 200 MONBOE COUNTY. spring with a boat. The channel soon becomes broader and pro-por
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