JvsE 14, 1895.] 



SCIENCE. 



G69 



strLking striu'tiiral feature on the sheet is 

 the Cartersville fault by which the meta- 

 iiiorphic rocks arc superposed upou the 

 unaltered Paleozoics. lu the northeiii 

 portion of the sheet the fault plane dips 

 eastward at a low angle, iu general less 

 than 15°, the Cambrian limestone and shale 

 passing under the l)lafk Algonkian slate 

 and conglomerate which lie iu open folds 

 to the eastward. 



In the \'icinitj' of Cartersville the fault 

 plane dips eastward much more steeply, 

 probably not less than 75°. A short dis- 

 tance east of this portion of the fault is a 

 large mass of granite, probably Archean, 

 to which the change iu the character of 

 the fault is doubtless due. While to the 

 north and south of this granite mass the 

 sedimentarj' rocks were readily moved upon 

 their bedding planes, so that they trans- 

 gressed a long distance upou the Paleozoics. 

 the absence of planes in the granite retarded 

 movement at this point, causing a deep re- 

 entrant angle in the course of the fault. A 

 further effect of the anchoring of the strata 

 by this granite mass is seen in the abnormal 

 strikes at its northern end. The sedimen- 

 tary rocks have been carried past it toward 

 the west, so that for a distance of fifteen 

 miles thej' strike northwest, at right angles 

 to the normal axes of this region. 



Alfred H. Brooks. ' Notes on the Crys- 

 talline Rocks of the Cartersville Sheet, 

 Oeorgia.' In this paper Mr. Brooks gave 

 petrogi-aphical descriptions of the granites, 

 diorite, gabbro and hornblende schist of the 

 Cartersville district. 



LicsTER F. Ward. ' The Red Hills and 

 Sand Hills of South Carolina.' The speaker 

 considered these well known topographic 

 features of a broad l)aud crossing Soutli 

 Carolina, concerning which various opinions 

 have been held, to be remnants of the Lafay- 

 ette formation. He descrilied localities 

 where the red and white sands were ol)- 

 iserved to grade into, or alternate with, each 



other as parts of one formation. As this 

 formation overlajis various older beds to the 

 granite, the discovery of Eocene fossils bj' 

 Tuomey at the l)ase of certain hills may be 

 understood. 



The red and white sands are associated 

 with shales and clays, and Professor Ward 

 believed that they were to be considered as 

 a northeastern extension of the ' Red loam ' 

 (Lafayette) formation of the Gulf States. 

 AVhitmax Cross, 



Secretai-y. 



XEW YORK ACADEMY OF SCIENCE.S. 



The section of geology met on Maj- 20, 

 and listened to the following papei-s : 



J. F. Kemp, ' The Iron-ore Bodies at 

 Mineville, Essex County, N. Y.' The 

 history of iron mining in this district was 

 l)riefly outlined by the speaker, and the 

 early development of the enormous ore- 

 bodies at Mineville was sketched. Tlieir 

 geological relations were then shown by 

 means of a series of sections, about twenty- 

 five in number, which had been prepared 

 l)y the engineer of the companies operating 

 the mines, Mr. S. B. McKee, assisted \}y the 

 speaker. These sections had been drawn 

 under the guidance of Prof. Kemp on panes 

 of thin crystal plate glass about one-eighth 

 inch in thickness and 21x33 inches. The 

 glass is of such transparency that the 

 entire series of sections came out very 

 clearly and showed the relations of the 

 ore-bodies with great Aividness. The scale 

 was one inch to the hundred feet, niakiug 

 thus twenty-five vertical sections, one hun- 

 dred feet apart and extending nearly half a 

 mile. It was at once apparent that Miller 

 Pit, Old Bed. '21,' the Bonanza and the 

 Joker ore-bodies were all really parts of 

 one enormous mass which lies on a pitching 

 anticline. Miller Pit and Old Bed are 

 faulted from each otlier and from '21.' A 

 trap dike intersects Miller Pit. In the field 

 the relations are verv confusing, and it can 



