Geology. 333 



being absent. These rocks are upturned and in flexures, making 

 ridges of what is called the Ouachita mountain system, extend- 

 ing from Little Rock, Central Arkansas, westward into the In- 

 dian Territory. The axis of uplift, about east and west in direc- 

 tion, "strikes toward the disturbed Paleozoic region between 

 Mississippi and Tennessee, which region has been regarded as a 

 southwestern termination of the Appalachian system." 



4. On the occurrence of Artesian and other underground 

 waters in Texas, Eastern New Mexico and Indian Territory, 

 west of the 97th Meridian ; by Robert T. Hill. 166 pp. 8vo, 

 with numerons maps, plates, and sections. From the Final Reports 

 of the Artesian and Underflow Investigations of the Department 

 of Agriculture. — Professor Hill commences his very thorough 

 Report with a general review of the topographical features of 

 Texas. He mentions in detail the results of Artesian borings 

 over the State, and discusses the observed facts in their relation 

 to the several rock strata that underlie the surface, and the topog- 

 raphy of the different regions. The special conditions on which 

 in each region success or failure depend are pointed out, and in the 

 explanations many geological details with regard to the stratifi- 

 cation are given and made clear by numerous illustrating sections 

 and maps. 



5. Geological Society of America. — A meeting of the Geo- 

 logical Society, of which Professor G. K. Gilbert, is President, 

 was held at Rochester, New York, on the 15th and 16th of 

 August, immediately preceding that of the American Association. 

 The following papers were read : L. C. Johnson, on Phosphate 

 fields in Florida ; C. H. Hitchcock, On the Connecticut Valley 

 glacier; E. W. Claypole, Dentition of Titanichthys and its allies ; 

 G. C. Broadhead, On the Ozarks and the geological history of 

 the Missouri Paleozoic ; G. F. Becker, On the finite, homogeneous 

 strain, flow and rupture of rocks; W. H. Hobbs, Phases in the 

 metamorphism of schists in Southern Berkshire ; C. L. Little, 

 On a metamorphic conglomerate in the Green Mts. ; J. Hall, On 

 the Oneonta sandstone; W. Upham, On Drumlins ; G. F. Wright, 

 On Extra-morainic drift of the Susquehanna Valley ; D. White, 

 A new Tseniopterid and its allies ; A. S. Tiffany, Overturn of L. 

 Silurian strata in Rennselaer Co., N. Y.; President Gilbert, On 

 Coon Butte of Arizona and the theories of its origin. 



The Society will hold its next meeting at Ottawa, Canada, 

 commencing on the 28th of December. 



6. Albirupean Studies ; by P. R. Uhler. Trans. Md. Acad. 

 Sci., 1892, pp. 185-201. — We have here another strong effort of 

 this author to vindicate his Albirupean formation, as outlined in 

 1888. He now expands it to include the entire clay series of 

 New Jersey and the Laminated Sands of that state, also all of 

 the Potomac formation of McGee coastward of the Iron Ore 

 Clays of Maryland, and prolongs it southward into Virginia to 

 take in the freestone quarries of Aquia Creek and Fredericks- 

 burg. This leaves very little of the great Atlantic Clay Belt for 



