1018 Subsurface Geologic Methods 



geochemical, biochemical, and geophysical data. These sheets are super- 

 imposed on the geologic note sheets of the same area. 



Survey sheets are filed as are the map-data sheets except that post 

 binders with insert Manila tab-divider sheets are utilized. The filing se- 

 quence is the same, and the index divider sheets are of the same size and 

 specification. 



Ore reserve sheets are filed in post binders in a manner identical to 

 survey sheets. 



Reports are filed in steel filing cases, as are geologic notes. The index 

 coordinate and location data are entered in spaces provided along the 

 binding edge of the report; the report is filed so that this edge is at the top. 



Ofiice maps are mounted in post binders of 24" x 44'' over-all size. 

 These binders are filed horizontally in steel filing cases Filing drawers 

 are 25" x 42^" and lY' or 2" deep. The system and sequence of filing 

 are the same as for field data with the exception that no folders are used 

 and level or elevation tabs are attached directly to the maps instead of 

 to index-divider sheets. 



Maps are filed, first, in order of increasing easting, and, second, in 

 order of increasing northing. To facilitate filing and location of maps, 

 the map areas are indicated on the same wall index map that is used for 

 note-sheet data. A narrow boundary line indicates available field note 

 sheets, and a wide or heavy line indicates available office maps. Boundary- 

 line color and matching-area shading indicates map scale. 



East-ordinate filing is in increasing order of east-boundary value. 

 Divider sheets, 23^"x 42", with attached 3" index tabs separate map areas 

 of different ordinate index values. The index tabs are offset progressively 

 right on each succeeding divider sheet. The offset is 0.8" for each 2,000' 

 east-ordinate map-boundary increase. 



North-ordinate filing is in increasing order of north-boundary ordi- 

 nate value. Ordinate values are typed on colored gummed labels which are 

 mounted on the tabs. 



Secondary filing is based on scale. Thus, the top sheet may be a 

 10,000' scale map covering a 200,000' x 400,000' area. Next, any 5,000' 

 scale subdivision maps prepared on any portion of the larger area are filed 

 in coordinate sequence. Sub-filed under these are 1,000' scale, then 200' 

 scale, and finally 50' scale subdivision maps. Index tab colors indicate 

 scale of maps underlying the divider sheets and conform with the color 

 standardization described in the note-sheet filing section. 



Levels and elevations are indicated by colored plastic index tabs with 

 typed inserts. (See section on "note sheet filing" for elevation tab-color 

 standardization.) "Mak-Ur-Own" plastic (3" wide) index tabs have cloth- 

 gummed attaching strips which are sewed directly to the cloth maps. The 

 tab offset is 1" per 100' of elevation decrease (fig. 538) . 



Sectional data is filed in secondary sequence to the corresponding 

 plan maps (those traversed by the section) . Tabs indicate sectional clas- 



