AGI Data Sheets: For Geology in the Field Laboratory and by J. Thomas Dutro Jr., Richard Vincent Dietrich, Richard M.

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By J. Thomas Dutro Jr., Richard Vincent Dietrich, Richard M. Foose

One of many best-kept secrets and techniques in geology is that this convenient compilation of geological details. even supposing pocket-sized, this spiral-bound and easy-to-read ebook deals an excessive amount of helpful info akin to geologic map symbols, actual standards graphs and charts, projection nets, checklists, and knowledge on approximately a hundred subject matters. excellent for speedy reference within the box, lab, and workplace.

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65 62 137 130 123 270 260 247 59 56 117 112 53 107 235 225 214 51 102 204 39 37 36 49 47 45 98 94 196 188 180 35 33 32 31 43 41 40 86 38 77 30 37 29 28 35 34 74 71 143 69 138 66 133 55 52 49 47 45 43 90 8. 7 2. 6 6. 5 6. 7 1. 4 II 83 80 173 166 160 154 148 To f1nd the contour spacing for a slope or dip angle of 24 degrees. with a contour interval of 20ft. locate line 24 in the left column and number 20 on the top line. At the intersection of these two lines, read the proper value for the contour spacing, which is 45ft.

By Siemon W. Muller, Stanford University PHYSICAL Tracing of beds or recognition of a known normal sequence. The top and bottom of ver- tical or steeply inclined beds may be determined by tracing to or correlating with the known normal (upright) sequence (A) in the area where these strata are either only gently folded (at B) or not at all deformed (at A). ~~~~~1~~J~~i~~~~l- Conglomerates. Basal and intraformational conglomerates may contain pebbles and boulders which can be recognized as having been derived from the beds below.

73 1o. 34 2u . 3! 2~ 1~. 9! 12 applicable for modern, interne focusing ordinory work with older, external focusing instruments. struments, add (I foot X sine vertical angle) to total computed vertical distance. 1 Trigonometric Formulas and Functi~o~n~s_ _ _ _ _ _ _ _ _ __ Compiled by R. V. '! tan n And: A=C sin a =B tan n c and cot " = E:l A ~:§: etc. Also: sin u =cos d ; tan u =cot ;1 ; etc. B=C cos" =A cot« Furthermore: C' = A2 + 8 2 C=-£- =-Bsm n cos ct And: rr + :3 = 90° OBLIQUE TRIANGLES A B sin ;i sin,, Therefore: A = ~~~l­ B =A sin J__ Sin a etc.

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