102 ABSTRACTS 



Geological Survey, he traced the relations of the Palaeozoic rocks to 

 the pre-Cambrian strata, showing that they set up into embayments at 

 Willsboro, Essex, Westport and Port Henry. The most interesting of 

 all are, however, at Crown Point and Ticonderoga. Small outlines of 

 Potsdam were shown in the valley of Trout Brook, west of Rogers 

 Rock on Lake George, and over a high divide ; from the lake and in 

 the valley of Lake George itself. The old depressions up which the 

 encroaching sea of the late Cambrian set are still discernible. Then, 

 with a succession of adjacent maps, the speaker traced out an old 

 depression back from Lake Champlain through Crown Point, with 

 several scattered outliers of Potsdam, thenqe southward past Penfield 

 Pond, and up a branch in central Ticonderoga, where another Pots- 

 dam outlier is found ; thence through the valley of Paragon and 

 Paradox lakes into the Schroon Lake valley, where a few acres of Calcif- 

 erous flinty limestone remain under Schroon Lake P. O. The last 

 named exposure is nearly twenty miles from Lake Champlain, and is 

 forty miles from the next outcrop down the Schroon and Hudson 

 rivers. Attention was called to the little outlier containing Potsdam, 

 Calciferous, Trenton, and Utica strata at Wells, on the Sacondaga 

 River, as recently figured by Mr. Darton. All these outliers are quite 

 flat, seldom reaching fifteen degrees, and as a rule dip northwest and 

 strike northeast. The original depressions were developed especially 

 where there is crystalline limestone. 



Stratigraphy and Patceontology of the Laramie and Related Forma- 

 tions in Wyoming. By T. W. Stanton and F. H. Knowlton. 

 The separation, in recent years, of the Denver, Arapahoe, and sim- 

 ilar formations in Colorado, and of the Livingston in Montana, from 

 the coal-bearing Laramie series, has called in question the unity of 

 the beds usually referred to the Laramie in Southern Wyoming. Sev- 

 eral facts in the reported stratigraphy and palseontology of the region 

 suggested the possible presence of the Denver beds. The same hori- 

 zon was suggested by the vertebrate fauna of the " Ceratops beds" in 

 Eastern Wyoming as described by Messrs. Marsh and Hatcher. In 

 view of these facts and queries the authors undertook the examination 

 of the Ceratops area in Converse county, and of the coal -bearing 

 localities along the Union Pacific Railroad, giving special attention to 

 the stratigraphy and to the branches of palseontology — invertebrates and 

 plants — in which they are respectively interested. The areas studied in 



