Geology. 543 



peneplain at an elevation of 4000 to 5000 feet and the Coastal 

 Plain inaugurated by the Post Miocene Uplift. The river valleys 

 are broad and U-shaped, and terminate in cirques. Many lakes 

 occur, which for the most part occupy ancient valleys blocked by 

 debris — as is indicated by soundings. Hot springs occur along 

 fault lines. 



The illustrations are excellent, especially the microphotographs 

 of metamorphic rocks by Mr. McKay. It is to be hoped that an 

 appropriation may be obtained to make a more detailed topo- 

 graphic map. h. e. g. 



2. Illinois State Geological Survey, H. Foster Bain, Director. 

 Gov. C. S. Deneen, Profs. T. C. Chamberlin and E. J. James, Com- 

 missioners. Bulletin No. 1, the Geological Map of Illinois ; by 

 Stuart Weller. Pp. 26, with map. Urbana, 1906. Bulletin 

 No. 2. The Petroleum Industry of Southeastern Illinois; by 

 W. S. Blatchlev. Pp. 109, 6 plates, 3 figures. — A new and 

 carefully prepared geological map is a fitting subject for the 

 first bulletin of the Illinois State Survey. Thirty years have 

 elapsed since the map prepared by A. H. Worthen was distributed 

 with Volume IV of the State Geological Report. This early 

 map has been used by Dr. Weller as a base and the additional 

 material available from the more recent work of various geolo- 

 gists has now enabled him to present a map which, while neces- 

 sarily open to further change and emendation, is a notable 

 advance upon what has been available before. The map as 

 issued measures 30X16 inches, in other words has been prepared 

 on a liberal scale ; it is also well executed and colored. Columnar 

 sections are added for Northern, Central and Southern Illinois. 

 The value of the map for economic purposes is much increased 

 by the careful presentation of the exact location of coal mines. 



The second Bulletin contains an account of the petroleum 

 resources of the state. Until very recently the state had yielded 

 very little either of oil or natural gas, although the search for 

 them began as early as 1853. In 1905 and the early part of 1906, 

 however, extensive investigations were carried on and with highly 

 encouraging results, especially in the southeastern part of the 

 state. In May, 1906, active production of crude oil and gas was 

 going on over an area about 40 by 12 miles in extent between 

 Westfield, Clark County, and Oblong, Crawford County. The 

 oil wells all lie near — and mostly to the east of — the long line of 

 deformation which extends across the state in a south-southeast- 

 erly direction from Stephenson to Lawrence County. The total 

 production of crude oil from the Casey Field, in Clark County, 

 for the eleven months ending with April, 1906, aggregated 

 400,000 barrels. 



3. Geological Survey of Ohio. Edward Orton, Jr., State 

 Geologist. Fourth series, Bulletin No. 4, pp. 361, map and 53 

 figures. Bulletin No. 5, pp. 79, 2 plates, 8 figures. — These 

 recently issued bulletins are devoted, No. 4 to the Limestone 

 Resources and the Lime Industry of the State of Ohio, by E. 



