Monthly Bulletin of the Canadian Mining Institute Volume 45-50
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...following the great Civil war. We should now prepare in Canada for the opportunities that will be ours at the close of the present conflict. NOTES ON PETRIFIED TREES FOUND IN THE ROSEDEER MINE, DRUMHELLER, ALBERTA By James Hargreaves (Rocky Mountain Branch Feb. Meeting, 1916). During the past few months, the writer has had the opportunity of studying the character, position and general features of petrified tree stumps, found in the Drumheller district, Alberta. In order to enable the reader to understand and follow the explanations closely, it is necessary to give a section of the seam, in descending order as follows: 1. Consolidated mud or clod with slips in every direction and without stratification. Thickness 2ft. 2. Top coal, average 3ft. 3. Very fine, plastic clay, with arenaceous matter almost absent. 2 ins. to 6 ins. 4. Coal, 8 ins. 5. Carbonaceous shale or bone, 2ins. to 6ins. 6. Coal. 2 ins. 7. Highly silicified rock with iron pyrites, disseminated throughout. 8. Coal. 6 ins. 9. Dark grey shale, thickness undetermined. A brief description is given also of the general method of plant growth in order that the significance of the observation made in reference to the petrified trees may be more apparent. There are three divisions of trees each being classified in accordance with its respective mode of growth. 1. The exogenous or outward growers in which the stem increases by the formation of annual layers deposited around the outside of the preceding layer such as in oak, chestnut, pine, hemlock, etc.. 2. The endogenous or inward growers in which the weedy matter is formed on the inside of the stem of which the Palmetto tree is an example. 3. The acregenous or summit growers in which the stem is produced by the lower stalks of the...
- 189 x 246 x 10mm | 340g
- 13 Sep 2013
- United States
- black & white illustrations