. The Quarterly journal of the Geological Society of London. tween the Possessions of Great Britain and theUnited States, where it passes along the 49th parallel of latitude fromhence to the Rocky Mountains. This lake is not without its claims to the attention of the Geolo-gical Society. It is here that the igneous and metamorphic rocks, which over-spread the half-drowned wildernesses of East Hudsons Bay, havetheir western termination (for this latitude) ;—here they sink out ofsight and are replaced westwards by sedimentary rocks. By an examination of the first-mentioned classes of rock in thi
. The Quarterly journal of the Geological Society of London. tween the Possessions of Great Britain and theUnited States, where it passes along the 49th parallel of latitude fromhence to the Rocky Mountains. This lake is not without its claims to the attention of the Geolo-gical Society. It is here that the igneous and metamorphic rocks, which over-spread the half-drowned wildernesses of East Hudsons Bay, havetheir western termination (for this latitude) ;—here they sink out ofsight and are replaced westwards by sedimentary rocks. By an examination of the first-mentioned classes of rock in thislake, we learn that they are generally conformable to the great bodyof crystalline strata which extend from hence 700 miles southwards,—to the River Mississippi in lat. 43°. This great breadth of rockshas a general strike to the The Lake of the Woods is 400 miles round by canoe-route, and is7^ miles in extreme length and breadth. Its shape, which is very * Quart. Journ. Geol. Soc. vol. iv. p. 50, pi, 5. Qua,rt:Jouj-rt,. geeLSoc. Yol TOT f\ XXU. , e l~r^ «J. 1852.] BIGSBY GEOLOGY OF THE LAKE OF THE WOODS. 401 irregular, is best learnt from a glance at the accompanying Map,PI. XXII. It is divided into three parts (each having its own name) by apromontory, 40 miles in direct length, which, beginning at the south-eastern angle of the lake, extends , and approaches vsdthin halfa mile of the western shore 30 miles from the northern extremity ofthe lake. This promontory first separates Whitefish Lake, and then LakeKaminitic, or the Lake of the Woods proper, from the Lake of theSand Hills, the entrances to each being barred by islands. Whitefish Lake has never been properly examined. I have seen itfrom three points 25 miles apart, and noticed several lofty basalticislands. It is supposed to be 120 miles round. The south and south-west side of Sandhill Lake has few or noislands, and its shores sweep around in large uniform curvaturesfaced by sand-hills or gravel
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
