REPORT ON THE BEVIER SHEET, including portions of Macon, Randolph and Chariton counties, by C. H. Gordon..... REPORT ON THE IRON MOUNTAIN SHEET, including portions of Iron, St. Francois and Madison counties, by Arthur Winslow, Erasmus Haworth IX. Cambrian limestone resting on sandstone and the latter on granite. Fig. 1. Outline map showing position of Iron Mountain sheet. 2. Hypsometric diagram of Iron Mountain sheet. 3. Diagram showing the distribution of forest trees. 4. Ideal cross-section at Doe Run, showing relations of sandstones and 8. General section of Paleozoic rocks. 9. Contour map of Iron Mountain mine. 10. Specular iron ore in porphyry at Iron mountain. 11. Section of main vein at Iron mountain. 12. Section showing relation of conglomerate beds to limestone. 13. Diagram illustrating channel form of bowlder deposits. 16. 17. Thickness and variation of La Motte sandstone Marble beds west of Fredericktown in Cedar bottom. 18. Cross-section through Mine la Motte estate. 19. Cross-section through Doe Run mines. 20. 21. 22. Stratigraphical details at Doe Run shaft. Fault on Little St. Francois river north of Fredericktown 23. Faults in Mine la Motte shaft No. 5. 24. Principal fault at Mine la Motte shafts. AREAL GEOLOGY OF MISSOURI. AREAL GEOLOGY AND ITS RELATIONS TO GENERAL GEOLOGICAL WORK. BY CHARLES ROLLIN KEYES. The investigation of the natural resources of a district is the chief practical end of geology. Upon this foundation rests the development of the mineral wealth of a region, and its commercial importance in the mine products is bastened. Prospecting goes on in every community to a greater or less extent, but not always in an intelligent way. It is a widely known fact that the greater share of ordinary prospecting is not only carried on unprofitably, but much of it without a shaddow of hope of success. It is the province of a state to encourage intelligent search for mineral wealth and to nurture reasonable efforts in the development of the natural resources. This a state attempts to do by supporting a systematic geological survey; and perhaps no investment, either public or private, yields both directly and indirectly so great a return for the amount expended, as that placed by the citizens of the commonwealth to conduct a careful investigation into the mineral resources. The results supply just that information which enables intelligent prospecting to be carried on in every county and which prevents much of the useless expenditure of money, time, and labor in hopeless enterprises. Wealthy corporations are able to spend large sums of money in developing mining districts. When local investigations of this kind are carried on the investigation partakes of the character of "expert" work. But the small land owner is prohibited on account of lack of means from making extended investigations. He must have something to guide him in what |