The Keweenaw Series of Michigan Volume 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ... large flow that often occurs close under the Calumet conglomerate. Ophite. Amygdaloid Sp. 16769 (1) Amygdaloidal melaphyre Sp. 16768 (9 paces) (12) Trap? Sp. 16767 (11) paces From 377 to 444 N. on 21st level. Ophite. Amygdaloid Sp. 16766 Trap Sp. 16765, 16764 (70 paces) 16765 is 1 to 2 mm. mottled?, 16764 is finer From 182 N. to 377 N. on 21st level. (27) (10) Ophite. Amygdaloid Trap From 182' (108) 16763, 16762 (7-J) 16761, 16760 (95) north to 84' south on the 21st level = 264' x sin 24 Total on 21st level from the base of the Calumet conglomerate 26. 858 + 84=942 x sin 24=384. A dip of 27 would imply a thickness of 440 feet, and the mine map evidently assumes a steeper dip than 24. This may be the hanging of the Osceola amygdaloid. It should be be-tween this and flow 35. (109) Amygdaloid Sp. 16759 at the end of 21st level (9)? Trap? (possibly two or more belts) (99) From 84 S. in 21st level to 25' + N.'in 23rd level 33. 59 (551) Amygdaloid Sp. 16758 (7) A brown amygdaloid, brecciated with chloritic amygdules Trap From 25 N. in 23rd level to 103 S. (52) 34. (42) (593) Amygdaloid (20)" from 103 to 153 S. of 23rd level Trap (21) from 153-205 S. in 23rd level About here should be the horizon of the Osceola amygdaloid, above or below Belt 33. 35. Ophite.. (141 say) Amygdaloid From 205-215 S. in 23rd level (5) Trap Sp. 16750, 16751 (63)+ (35?)=98 +? (734) f: To the caved-in end of the 23rd level South, 360'+ at which point the rock is still a well-marked ophite, Sp. 16750, and the mottling is 2 or 3 mm. across, so that the belt mustrbe close to 100 feet thick, for this grain if below the center would be perhaps 35' from the bottom. Now the top of the northern-most amygdaloid in the 31st level at 1215, is by scaling at a dip of 24 just 100 feet below the t...