Rapport annuel du Minéralogue de l'État pour l'année se terminant ... . entonnoirs des comtés du Nevada, de la Sierra, et de placer, etc. TheSpire Claim est situé à six kilomètres au sud-ouest de la ville de Sonora, ind à ce point le canal est d'environ quatre-vingt pieds en largeur. Le calotte de basalte mesure environ six cent pieds de large et cent cinquante tyeet d'épaisseur. L'érosion semble avoir été à ce point confinement et crêtes; tandis que vers l'ouest, Woods Creek coule à une profondeur d'environ fouririncipalement au côté ouest de la table, le côté est allant dans les pieds lowaunds du haut de la table. Le gravier ici est en soi

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Annual report of the State Mineralogist for the year ending ... . nels of Nevada, Sierra, and Placer Counties, etc. TheSmpire Claim is situated four miles southwest from the town of Sonora, ind at this point the channel is about eighty feet in width. The cap-ring of basalt is about six hundred feet wide and one hundred and fiftyeet thick. The erosion seems to have been at this point confinedlills and ridges; while west, Woods Creek runs at a depth of about fouririncipally to the west side of the table, the east side going off into lowaundred feet from the top of the table. The gravel here is separatedn about the center of the channel by twenty feet of the volcanic matter, •jvhich seems to have thrown the gravel to either side, it running from a: feather edge to a thickness of about ten feet on either rim, where theRichest gravel is found. I here append a cross-section of the tablenountain, at a point through it cutting the Empire channel longitudi-nally, which tunnel is on the county road from Sonora to Milton, dis-tant about four miles from Sonora:. The diagram will serve for almost any cross-section through the tablenountain, as regards its strata. The limestone formation that courses through the county from northT>o south is one of the most peculiar formations extant. It is veryrregular in width, varying from several miles at the northern part of thelimnty to a half mile where it passes through the town of Sonora, itscourse being to this point nearly north and south; from here it coursessoutheast through the county, with an average width of from a mile toIro miles. There are four distinct runs of slate coursing north throught, and they merge into two south of Sonora, and continue with theimestone until it reaches the county line, where the limestone hasDecome denuded, either by the action of the elements or from the work)f the thousands of miners who in years gone by placer-mined in the3nvirons of Columbia, Springfield, Browns Flat, and Shaws Flat. Inihis imme

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