90 



SCIENCE. 



[N. S. Vol. XV. No. 368. 



Use of the terms Linden and Clifton Lime- 

 stones in Tennessee Geology: Aug. F. 

 FoBESTE, Dayton, Ohio. 

 The Lower Helderberg was named in 

 Tennessee from its exposure at Linden, 

 where it is but 12 feet thick, while the 

 maximum thickness is between 75 and 100 

 feet. Foerste questioned the advisability of 

 naming a formation from the place of its 

 minimum exposure. Faunal and strati- 

 graphic characteristics were given. 



Bearing of the Clinton and Osgood Forma- 

 tions on the Age of the Cincinnati Anti- 

 cline: A. F. Foerste, Dayton, Ohio. 

 In continuation of former studies the 

 author developed his interpretation of the 

 Cincinnati anticline. The Devonian axis 

 of the anticline was northeast and south- 

 west, while the present axis is north and 

 south. The Clinton strata over the central 

 portion of the anticline are coarse lime- 

 sands mth wave marks and crossbedding, 

 and beds of conglomerates. North and 

 south of this area, the material is a fine 

 lime-mud. The relation of these features 

 to those formerly described was discussed. 

 J. M. Clarke discussed the subdivision of 

 the Lower Helderberg of Tennessee. The 

 fauna has a Silurian faeies. I. C. White 

 called attention to the importance of the 

 Clinton Iron Ore bed, and its extension in 

 Maryland and Pennsylvania. Brief re- 

 marks were also made by H. M. Ami and 

 B. K. Emerson. 



Notes on the Catalogue of Types in the 

 Geological Department of the American 

 Museum of Natural History: E. O. 

 HovEY, New York. 



The paper was an exposition of the great 

 work recently completed at the Museum in 

 the cataloguing of the large number of 

 types and figured specimens in the 

 Museum, and of looking up references for 

 each specimen. Complimentary remarks 



were made by J. M. Clarke, H. M. Ami, and 



others. 



The New Carboniferous Age of the Union 



and Riverdale formations in Nova 



Scotia: H. M. Ami, Ottawa, Ont. 



In Colchester county lower Carbonifer- 

 ous beds are thrust over the newer Union 

 and Riverdale beds, which by their fossils 

 are known to be middle Carboniferous. In 

 Pictou county the Lower Carboniferous 

 rest unconformably upon the upturned Eo- 

 Devonian, with which the Union and 

 Riverdale beds were formerly correlated 

 by stratigraphers. The evidence of the 

 overthrust is, however, complete. The 

 Union and Riverdale beds of Nova Scotia 

 are equivalent respectively to the Mispeck 

 and Lancaster formations of New Bruns- 

 wick. 

 Origin of the Faunas of the Marcellus 



Limestones of New York: John M. 



Clarke, Albany, N. Y. 



The Marcellus fauna is characteristically 

 a bituminous mud fauna. Two prominent 

 limestone beds, the Goniatite and Stafford 

 limestones, carry, the one an upper Onon- 

 daga fauna, and the other a lower Hamil- 

 ton fauna. The former makes its appear- 

 ance near the meridian of Rochester, and 

 extends eastward, rising relatively higher 

 and higher in the bituminous shales. The 

 other ends at the same meridian and 

 thickens westward. The fauna of the 

 Goniatite limestone (fauna of Agoniatites 

 expansus) represents an eastward migra- 

 tion of the upper Onondaga fauna, which 

 had persisted in the west, while the bitu- 

 minous mud fauna had already become 

 established in the east. The Stafford lime- 

 stone fauna is a prenuncial Hamilton fauna, 

 which persisted for a time and then was 

 overwhelmed again. The Onondaga and 

 Hamilton faunas appear to have come 

 from the northwest, while the bituminous 

 mud fauna of the typical Marcellus shales 

 came from the southwest. 



