Reports, Volume 2, Part 2 (Google eBook)

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State Geologist, 1914 - Geology
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Page 216 - The office adjustment of the notes and the reduction to mean sea level datum may so change some of the figures that the original markings are 1 or 2 feet in error. It is assumed that engineers and others who have occasion to use the bench-mark elevations will apply to the Director of the United States Geological Survey...
Page 345 - COUNTIES. The elevations in the following list were determined by primary leveling extended from the precise-level line from Shawneetown, 111., to Cerulean, Ky., and the precise-level line of the United States Corps of Engineers along the Ohio River as adjusted by the Coast and Geodetic Survey.
Page 216 - The bottom is spread out to a width of 10 inches in order to give a firm bearing on the earth. A bronze or aluminum-bronze cap is riveted upon the top of the post which is set about 3 feet in the ground.
Page 217 - ... long narrow bays, rivers, and like features will not affect the height of the water. To obtain even approximately correct results these observations must extend over at least one lunar month, and if accuracy is desired they must extend over several years. At ocean stations the half-tide level and the mean sea level usually differ but little. It is assumed that there is no difference between the mean sea level as determined from observations in the Atlantic Ocean, the Gulf of Mexico, and the Pacific...
Page 216 - I), 3^ inches in diameter and one-quarter inch thick, having a 3-inch stem, which is cemented in a drill hole in solid rock in the wall of some public building, a bridge abutment, or other substantial masonry structure. The second form (F, PI.
Page 217 - Mexico, or the Pacific Ocean. The connection with tidal stations for bench marks in certain areas that lie at some distance from the seacoast is still uncertain, and this fact is indicated by the addition of a letter or word to the right of the word "DATUM
Page 217 - ... were eliminated. This level is not the elevation determined from the mean of the highest and the lowest tides, nor is it the half sum of the mean of all the high tides and the. mean of all the low tides, which is called the half-tide level. Mean sea level is the average height of the water, all stages of the tide being considered. It is determined from observations made by means of tidal gages placed at stations where local conditions, such as long, narrow bays, rivers, arid like features, will...
Page 85 - No apparent pyrites, but some ferruginous stains; seems to be a somewhat weathered sample." CHICKEN BRANCH. On the left, 1% miles up Laurel creek: Altitude of mouth, 825. On the left, % mile up the branch, Mrs. Hounschell has a long entry at branch level, from which the following section was obtained, the lower coal and parting being given as reliably reported : Manchester Bed. Shale 15 Feet. Coal 30" Fire-clay 7" Coal 13
Page 62 - Lower Bench. Though taken from a muddy outcrop, Dr. Peter reports of this coal: "A pretty purelooking sample. Breaking into thin irregular laminae, with some fibrous coal apparent, but no pyrites visible. The excessive ash cannot all be attributed to adhering mud, nor does a late view of the bed indicate a poor coal." Slickenseit. "Pitch-black, pure-looking coal. Fracture irregular. No fibrous coal or pyrite apparent.
Page 216 - The numbers stamped on the bench marks described in the following pages represent the elevations to the nearest foot as determined by the levelman. These numbers are stamped with ^~ inch steel dies on the tablets or post caps, to the left of the word "feet.

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