750 



APPENDIX. 



B.— Hudson Period (p. 217). 



The Lorraine shales (designated in part Pulaski shales in the N.Y. Annual 

 Geological Keports) were so named from the town of Lorraine, in the southern 

 part of Jefferson co., N.Y., where the whole thickness of the beds overlying the 

 TJtica shales is well exposed. They include the western part of the Hudson 

 River formation in the State of New York. They consist of thin beds of gray 

 sandstone, alternating with fine argillaceous shales. The beds are in general 

 nearly horizontal ; they extend eastward along the Mohawk valley. 



Although the Hudson River formation has lost a large part of its strata in 

 the Hudson River valley by the discovery that the upturned ' slates of that 

 region are of the Potsdam period, it still retains some portions on the west side 

 of the river, enough to render it proper to continue to use the name for the 

 formation and for the period to which it belongs. The name is now so much 

 a part of the science in Europe, as well as in America, that any change is greatly 

 to be deprecated. 



C. — Devonian Age. 



According to E. Jewett, recent observations, both stratigraphical and palaeon- 

 tological, by himself and J. M. Way, in Delaware co., N.Y., tend to prove that 

 the rocks of the so-called Catskill group are probably all Chemung. Several 

 fossils from distant localities have been identified with Chemung species. 



Figure 983 represents in outline, half the natural size, a portion of a fossil 

 plant from the Chemung beds, found at Wisner's quarry near Elmira, Chemung 

 CO., N.Y., — the Lepidodenolron Chemungensis D. (Sigillaria Chemungensis Hall). 

 The specimen figured by Hall was 12 J inches long, and from 2 inches to 2J wide. 



Fig. 984. 



Figure 984 is a peculiar plant, a little like the Noeggerathiae in habit, figured 

 by H. D. Rogers on Plate 22 of the Geological Report of Pennsylvania. On 

 the plate it is stated that it is a fossil plant from the Ponent sandstone beds, or 

 of the Catskill period. There is no reference to it in the text. The color of the 

 plate indicates that the rock was reddish. Is it from the Mesozoic of Penn- 

 sylvania ? 



The figure of the Noeggerdthia on page 291 is from a portion of a very large 

 frond on limestone, found at Montrose, Pa., by Rev. H. A. Riley. 



