Geological Reports of Douglass Houghton: First State Geologist of Michigan, 1837-1845Michigan Historical commission, 1928 - 700 Seiten |
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abundant amount appears Branch county calcareous carbonate character clay coal coast color commenced compact complete composed conglomerate considerable contain copper deposites depth Detroit diluviums distance district Douglass Houghton east easterly Eaton county elevated embraced examined extent feet formation fossils furnish geological survey Geologist Grand river gravel greenstone gypsum hundred inches iron island Kalamazoo river labor Lake Huron Lake Michigan Lake Superior lands lime limerock limestone Linn manufacture maps marl marshes masses matter miles mineral Montreal river mouth Muhl nearly northern noticed observed occupied occur Ontonagon river peat portion quantity quarried quartz range of hills render ridge rise rock Saginaw saline salt springs sand sandrock sandstone sedimentary rocks shale shore soil strata streams sufficient surface thickness timber tion topographical town township trap Traverse upper peninsula varying veins vicinity westerly whole
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Seite 550 - Where a rock is crossed and penetrated by a great number of small veins in every direction, the whole mass is sometimes worked as an ore and is called by the Germans a
Seite 334 - Mica Slate. One of the stratified rocks belonging to the primary class. It is generally fissile, and is characterized by being composed of mica and quartz, of which the former either predominates, or is disposed in layers, so that its flat surfaces give it the appearance of predominating. Miocene. One of the deposites of the tertiary epoch.
Seite 331 - Some of these are but slightly changed, other are petrified and the organic replaced by mineral matter ; some have decayed and left the impression of the bodies, while others have been formed by mineral matter deposited in the cavities left by the decay of the organic body. These last are called casts. The term petrifaction is applied to those cases in which organic matter has been replaced by mineral substances. The form and structure of the original body both remain. In casts the exterior form...
Seite 337 - TERTIARY STRATA. A series of sedimentary rocks, with characters which distinguish them from two other great series of strata, — the secondary and primary, which lie beneath them. TESTACEA. Molluscous animals, having a shelly covering.
Seite 17 - ... jointly and severally, firmly by these presents. Signed with our hands and sealed with our seals this day of 1844.
Seite 174 - Several parties of surveyors are now nearly in readiness 1o commence the work north of the town mentioned, and we confidently hope, that during the ensuing year the chief part of the subdivisions which remain to be done, may be completed. It is not my intention, at this time, to enter into a minute description of the order of superposition of...
Seite 172 - This range, at its commencement, is usually known as the highlands of the Au Sable. These hills follow the line of bearing of the rock formation, and no doubt extend diagonally completely across the state, forming a portion of the summit of the mi re northern part of the peninsula.
Seite 398 - Department additional appropriations to the amount of $2,511,132 98, the special objects of which will be seen by reference to the report of the secretary of war. The anticipated means of the treasury are greatly inadequate to this demand. The receipts...
Seite 332 - Gypsum. A mineral, composed of sulphuric acid and lime, and extensively used as a stimulant manure, and for making stucco and plaster casts, &c. It is also called Plaster of Paris. Hornblende. A mineral of a dark green or black color, and which is a constituent part of greenstone. Hornstone. A siliceous mineral, approaching to flint in its character.
Seite 332 - Geology. A science which has for its object to investigate the structure of the earth, the materials of which it is composed, the manner in which these are arranged, with regard to each other ; and it considers the action of all natural causes in producing changes, such as the effects of frost, rain, floods, tides, currents, winds, earthquakes, and volcanoes. Economical Geology refers to the applications of geological facts and observations to the useful purposes of civilized life.