PHOTOGRAPHS DONATED TO THE SOCIETY 471 



(14). Fault surface in the foothills of the Silver Peak range southwest of 



Clayton valley, Nevada. The rock is rhyolite-tuff. (1899.) 

 (17). Group of cones formed by the unequal erosion of rhyolite-tuff in the 



foothills of the Palmetto mountains south of Clayton valley, Nevada. 



(1899.) 

 (18). A single cone of rhyolite-tuff from the same locality as number 17, in 



the foothills of the Palmetto mountains, Nevada. (1899.) 



Six 4x5 photographs, by J. A. Taff 



(31). Recumbent fold in sandstone, Saint Louis and San Francisco railway, 



south base of Winding Stair mountain, Indian territory. 

 (31,\ Recumbent fold in sandstone. Saint Louis and San Francisco railway, 



south base of Winding Stair mountain, Indian territory. Panorama. 

 (63). Faulted sandstone and shale, Kansas City Southern railway, 1 mile 



southeast of Houston, Indian territory. 

 (64). Faulted sandstone and shale, Kansas City Southern railway, 1 mile 



southeast of Houston, Indian territory. 

 (34). Faulted sandstone and shale, Kansas City Southern railway, 1 mile 



southeast of Houston, Indian territory. 

 (35). Faulted sandstone and shale, Kansas City Southern railway, 1 mile 



east. 



The suggestions in the report of the Photograph Committee were dis- 

 cussed by several Fellows, and it was voted to accept the report and to 

 refer the suggestions to the Council for report to the Society the next day. 



The first paper of the scientific program was 



LAURENTIAN LIMESTONES OF BAFFINLAND 

 BY ROBERT BELL 



[^ Abstract] 



The discovery of great quantities of crystalline limestones in Baffinland was 

 announced in the writer's summary report for 1897. Geographical position and 

 physical aspect of the region described. General character of the Laurentian sys- 

 tem in Hudson straits. The rocks of the north side are newer or Upper Lauren- 

 tian, as far as known, and differ from those of the south shore. Regularity of 

 strike and dip. Enormous development of crystalline limestones in southern 

 Baffinland. Their general characters Great thickness of the beds, some of them 

 being over a mile and running regularly for long distances. Evidently stratified 

 aqueous deposits. Questions as to the origin of such limestones. The associated 

 rocks and minerals. Owing to the absence of trees, the limestones are conspicuous 

 in the landscape. Not more eroded than the gneisses. Comparison with Lauren- 

 tian limestones elsewhere. Former physical conditions and the older and newer 

 glaciations of Baffinland as affecting the limestones. The existing glaciers there. 



