Subsurface and Office Representation in Mining Geology 1037 



11. Describe note-sheet and oflfice-map indexing. 



12. Describe note-sheet and map filing and filing sequence. 



13. Why are side-note lines oriented parallel to ordinate lines? 



14. What are three classifications of geologic features which are repre- 

 sented on geologic maps? 



15. What symbols are used to designate phaneritic, aphanitic, porphyritic, 

 and pegmatitic textures for office-map representation? 



16. What rock types and geologic features are represented in black? 



17. For the representation of what types of rocks or effects is color used? 



18. What is meant by "color progression"? 



19. Transparent colors are used for what type of representation? 



20. Why must color used in geologic representation be carefully chosen? 



21. What precautions must be taken when selecting colors in superposi- 

 tion? 



22. What are "cumulative" colors? 



23. What color types are utilized to represent basic and acid rocks re- 

 spectively? 



24. List color representation progression from basic igneous rocks to 

 metallization effects. 



25. Why are these colors used? 



26. How does office-map geologic legend differ from field-subsurface 

 legend? 



27. Why is soil cover indicated on note sheets and maps? 



28. Why are dumps and other man-made deposits represented composi- 

 tionally? 



29. What are metallization maps? 



30. How are metallization maps prepared? 



31. How are quantitative and qualitative values, respectively, indicated 

 on metallization maps? 



32. Give two reasons why neat and orderly side notes are important. 



33. How large should side note descriptions be? 



34. What determines projection direction of geologic features? 



35. In what manner and where are side notes recorded on note sheets and 

 maps? 



36. What type of abbreviations are used in side-note descriptions? 



37. Describe gneissic rock representation on field-subsurface and office 

 maps respectively. 



38. What is the recommended reference projection-plane attitude used in 

 longitudinal section preparation? 



39. How is vein configuration represented on longitudinal projections? 



40. How is paragenetic sequence and textural representation correlated? 



