278 THE JOURNAL OF GEOLOGY. 



volunteer assistants during this time ; the two whose contribu- 

 tions are to be found in the survey reports being Professor W. C. 

 Stubbs, who made a number of chemical analyses, besides taking 

 part in the field work, and Mr. T. H. Aldrich, who prepared a 

 valuable sketch of the early history of coal mining operations 

 in Alabama, published in the report for 1875. • ^ 



Publications. — During this period of ten years there were pub- 

 lished four annual reports, viz., for 1873, 1874, 1875, and 1876, 

 and three biennial reports, viz., for 1877-8, 1879-80, and 188 1-2. 



With the exception of the Agricultural report of 188 1-2, these 

 were of the nature of preliminary or reconnoissance reports, and 

 they deal chiefly with the economic features of the state. The 

 report for 1873 was a mere statement of the plan of the work 

 proposed. That of 1874 is concerned with the crystalline region, 

 and particularly with the copper-bearing strata. At the time 

 when the examinations were made there, the whole section was 

 greatly interested in the subject of copper, just as now it is 

 interested in gold. A part of the next report, 1875, treated of 

 the same subject, but the greater part of it was devoted to the 

 examination and classification of the Valley formations, of Jones' 

 Valley and the great Coosa Valley region. Professor Tuomey 

 recognized the occurrence in these valleys of the Silurian, Dev- 

 onian, and Subcarboniferous formations, without undertaking the 

 subdivision of the same, except in the case of the Clinton and 

 Trenton. During the summer of 1875, it was possible for the 

 writer to establish the practical identity of these formations with 

 what had already been so clearly described for Tennessee by 

 Professor Safford, and he established the fact of the existence in 

 Alabama of the Ocoee, Chilhowee, Knox Sandstone, Shale and 

 Dolomite, the Lower and Upper Subcarboniferous with their 

 respective minor divisions. The report for 1875 contained also 

 the sketch of the early history of Coal Mining in Alabama, to 

 which reference has already been made above, and there were 

 also presented the records of the borings by diamond drill in the 

 different parts of the Warrior Field together with an attempt at 

 correlating the same. The report holds also many details of the 



