. Annual report. New York State Museum; Science; Science. ADIRONDACK MAGNETIC IRON ORES 133 is only from 50 to 100 feet above the river and it continues practically at the same level for a distance of 500 feet or so to- the north. The strike of the ore is here about n. 6o° e. West of the pits the deposit follows that course nearly in a straight line for a distance of 1000 feet; it then turns quite abruptly toward the northwest, at nearly right angles to its former direction, and ascends the ridge. It apparently dies out or disappears in a swampy tract about a mile west of the railroad station.
. Annual report. New York State Museum; Science; Science. ADIRONDACK MAGNETIC IRON ORES 133 is only from 50 to 100 feet above the river and it continues practically at the same level for a distance of 500 feet or so to- the north. The strike of the ore is here about n. 6o° e. West of the pits the deposit follows that course nearly in a straight line for a distance of 1000 feet; it then turns quite abruptly toward the northwest, at nearly right angles to its former direction, and ascends the ridge. It apparently dies out or disappears in a swampy tract about a mile west of the railroad station. The outcrop is concealed over considerable intervals, but the magnetic determinations serve to fix its course with reasonable accuracy. North of the pit the con- tinuation of the ore can be traced across the highway and brook. There is some uncertainty as to the further extent of the deposit owing to the heavy covering of drift, though the magnetic surveys indicate that it wedges out or grades into the country rock within a few hundred feet north of the brook. The strike in this part is nearly due Fig. 22 Benson Mines. Section across the ore bodies, near middle of quarry Observations of the dip of the ore and inclosing strata show a monoclinal arrangement for the central and northern parts of the ore belt. The gneiss on top of the ridge lies nearly flat. Passing across the strike to the southeast the dip increases gradually until at the pits it is about 450 southeast. This inclination is main- tained with little variation for 1000 feet along the outcrop of the ore to the southwest. At the bend or fold in the deposit where it swings toward the northwest, the dip is 6o° southeast. Beyond the bend there is a flattening of the dip, and over the remaining distance in which the ore can be traced the outcrops show the strata lying nearly horizontal or slightly inclined to the northwest. The change in the dip takes place within an interval of 100 feet and would seem to indic
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