292 



SCIENCE. 



[N. S. Vol. XVII. No. 425. 



Devonian and Carioniferous Bocks of 



Southwestern New York: L. C. Glenn. 



The speaker discussed, with the aid of 

 diagrams and maps, the puzzling question 

 of the transition strata on the border be- 

 tween the Devonian and Carboniferous of 

 southwestern New York and northern 

 Pennsylvania. The strata are prevailingly 

 shales with lentieles of conglomerate. They 

 have received formational names, and by 

 agreement between the paleontologists of 

 New York and the U. S. Geological Survey 

 the break between the periods has been 

 placed at the base of tiie Wolf Creek con- 

 glomerate. In discussion J. M. Clarke de- 

 scribed the nature of the faunal change. 

 It is more sharply marked at the Wolf 

 Creek conglomerate than elsewhere, al- 

 though these are both antecedent Carbonif- 

 erous forms and surviving Devonian ones, 

 respectively, below and above the conglom- 

 erate. 



H. S. Williams, likewise, emphasized the 

 faunal relations, and also discussed some of 

 the equivalencies of conglomerates in sepa- 

 rated areas, suggested by the author. An- 

 other speaker remarked the possibility of 

 throwing much light on the boundary be- 

 tween Devonian and Carboniferous by an 

 investigation in southeastern Pennsylvania 

 of the strata under the anthracite measures. 



This paper closed the morning session. 

 On reassembling after lunch the society 

 divided into a petrographic section and a 

 stratigraphic, each being held in different 

 rooms. The stratigraphic papers follow 

 immediately; after them the petrographic 

 are given. 



Stratigraphic Relations of the Bed Beds to 

 the Carboniferous and Permian in North- 

 ern Texas: Geo. I. Adams, Washington, 

 D. C. 



As a result of a reconnoisance in north- 

 em Texas it has been learned that the 



Wichita and Clear Fork divisions of the 

 Permian, as defined by Mr. Cummins, of 

 the Texas Survey, are in part equivalent 

 to the Albany and Cisco divisions of what 

 has been considered Carboniferous. The 

 approximate limit of the red color is a line 

 diagonal to the strike of the formations. 



Comparison of Stratigraphy of the Big 

 Rom Mountains, Black Hills and Bocky 

 Mountain Front Bange: N. H. Darton, 

 Washington, D. C. 



This communication embodied some of 

 the results of several years' detailed study 

 of the stratigraphy of Black Hills and Big 

 Horn Mountain uplifts, and a series of ob- 

 servations extended along the front ranges 

 of the Rocky Mountains in Wyoming and 

 Colorado to ascertain the stratigraphic re- 

 lations of the Cambrian to the Cretaceous 

 formations in their southern extension. It 

 has been found that the broader features 

 are of wide distribution, but they present 

 local variations due to differences in over- 

 laps and dates of uplift. Some distinctive 

 beds at several horizons have been traced 

 continuously from far north in Dakota 

 through Wyoming and Colorado, afford- 

 ing important reference planes for the 

 correlation of the more variable or less dis- 

 tinctive members. The data throw much 

 light on the history of the uplifts, especially 

 the discovery of Laramie conglomerates 

 containing carboniferous limestone pebbles. 

 The paper was illustrated by colored 

 slides. One of the points emphasized by 

 them was the unconformable contact be- 

 tween the Marine Jura and the Red beds 

 or Permic. This unrepresented interval 

 corresponds to the Trias. 



Age of the Atlantosaurus Beds: W. T. Lee. 



Trinidad, Col. (Introduced by W. B. 



Clark.) 



The paper dealt with the extension of the 

 Atlantosaurus shales from their type local- 



