Apbii 16, 1909] 



SCIENCE 



629 



Olaoial Erosion on Kelley's Island, Ohio: Feank 



Cabney, Granville, 0. 



Last summer a rectangular area albout 100 rods 

 long and 4 rods wide was stripped to open a new 

 quarry. This area is transverse to the direction 

 of ice-motion; its southern part does not show the 

 slightest evidence of rasping by stone-shod ice. 

 Tliis rough unglaciated surface ends abruptly in 

 a perfectly smooth, scored area which continues 

 about 800 feet, where it again borders limestone 

 bearing no marks whatever of ice-work. The ero- 

 sion features thus revealed are so in contrast with 

 the long-known glaciated surfaces near by that 

 the case deserves special consideration. 



The paper was discussed by Professor G. F. 

 Wright. 



Then was read: 



The Chalk Formations of Northeast Texas; C. H. 



GoEDON, Knoxville, Tennessee. 



Extending in a west to east direction across the 

 southern part of Lamar County and thence north- 

 east through Red River County to Red River and 

 having a width of from one to three miles, is a 

 belt of chalk known as the Annona chalk from 

 the town in Red River County near which it out- 

 crops. In the earlier publications relating to the 

 Cretaceous of Texas, this formation was consid- 

 ered as the diminished representative of the 

 Austin chalk of central Texas. Later authors, 

 however, have contended that it represents a 

 higher horizon and belongs within the so-called 

 Navarro division of the Upper Cretaceous. 



Recent investigations by the author, in connec- 

 tion with the study of the underground waters of 

 northeastern Texas, tend to confirm the earlier 

 view as advanced by Taif that the Annona is the 

 northeastward extension of the Austin formation. 

 Tracing the outcrop of the Annona westward it 

 was found to merge with that of the Austin as 

 exposed in the vicinity of Honey Grove and west- 

 ward to Sherman. At Austin the formation has a 

 reported thickness of about six hundred feet and 

 is composed essentially of chalk throughout. 

 Toward the northeast the lower beds become 

 marly, the thickness of the chalk marl increasing 

 until in the vicinity of Red River the marls have 

 a thickness of about four hundred feet. To this 

 part of the formation, as represented in north- 

 eastern Texas and southwestern Arkansas, Hill 

 applied the name Brownstown beds. 



The relations seem to indicate that at the be- 

 ginning of the Austin epoch the conditions for 

 the formation of pure chalk existed only in the 

 region about Austin, but with the progress of 



time they were extended farther and farther north- 

 east as a result possibly of a change in the rela- 

 tive position of land and sea. 



The next paper was read by title : 

 Geologic History of the Ouachita Region: E. 0. 



Ulbich, Washington, D. C. 



After which was read: 

 Some Results of an Investigation of the Coastal 



Plain Formations of the Area between Massa- 

 chusetts and North Carolina: Wm. Buixock 



Clabk, Baltimore, Md. 



The author has under his supervision for the 

 U. S. Geological Survey the investigation and 

 correlation of the coastal plain formations occupy- 

 ing the territory between Massachusetts and 

 North Carolina, inclusive, and has had associated 

 with him in his work a number of co-workers. 

 Some preliminary results of significance have been 

 secured and the formations already studied in 

 detail in New Jersey, Delaware and Maryland 

 have been traced beyond the borders of those re- 

 gions. The extension of certain of these forma- 

 tions southward through Virginia and North 

 Carolina and the recognition of new members of 

 the coastal plain series have materially added to 

 our knowledge of coastal plain geology. Some of 

 the more significant results of this work were 

 presented. 



This paper was followed by the reading of: 

 The Geologic Relations of the Cretaceous Florae 



of Virginia and North Carolina: Edwakd W. 



Beery, Baltimore, Md. ( Introduced by Wm. B. 



Clark.) 



The evidence of the fossil plants concerning the 

 geologic segregation and correlation of the Cre- 

 taceous of the Middle Atlantic Slope was presented 

 by the author. Floras similar to those of the 

 adjoining region to the northward have been 

 found at many localities, indicating the extension 

 to the southward of a number of the formations. 



The special section on correlation having ad- 

 journed, the society then listened in general ses- 

 sion to the following papers: 

 Paleogeography of North America: Chables 



ScHTJCHEET, Ncw Havcu, Conn. 



The ancient geography of North America, be- 

 ginning with the Cambrian, was discussed and 

 illustrated by from forty to fifty maps of as 

 many different times. These maps give the prob- 

 able extent of the marine inundations over the 

 North American continent, and show the extent 

 of the faunal provinces. 



The diastrophism indicated by these maps is- 

 plotted on a time-geographic curve to show the 



