94 



SCIENCE. 



[N. S. Vol. V. No. 107. 



monoclinal structure prevails, low folds, 

 particularly in the Brunswick beds, are 

 common. A total thickness of 20,000 feet 

 for the Newark system across New Jersey 

 was given as the nearest estimate of the 

 writer. 



The Upper Cretaceous Formations of the North- 

 ern Atlantic Coastal Plain. William B. 

 Clark, Baltimore, Md. 

 This paper was prepared in cooperation 

 with Messrs. R. M. Bagg and George B. 

 Shattuck, who had been Prof. Clark's geo- 

 logical assistants for several years. The 

 areal distribution of the five Post- Potomac 

 Cretaceous formations was represented upon 

 a map on the scale of one mile to the inch, 

 which embraced the area between New 

 York Bay and the Potomac River. The 

 variations in sedimentation and structural 

 relations presented throughout this distance 

 of over two hundred miles were described, 

 as well as the faunal characteristics of the 

 several formations. 



The Matawan-Monmouth formations were 

 shown to be equivalent of the Cretaceous 

 Eutaw — -Rotten Limestone — Ripley groups 

 of Alabama ; and the Pamunkey equivalent 

 of the Eocene Lignitic^Claiborne group of 

 the same area, so that the Rancocas-Manas- 

 quan-Shark River formations represent the 

 interval between the Ripley and Lignitic, 

 the first two being of Cretaceous age, the 

 last of Eocene age. 



It was also shown that the "Upper Cre- 

 taceous formations of the Atlantic coast are 

 the approximate equivalents of the Senonian 

 and Danian, of Europe. 



Notes on the Stratigraphy and Paleontology of 

 the Laramie and Related Formations in Wyo- 

 ming. T. W. Stajstton and F. H. Knowl- 

 TON, Washington, D. C. 

 I. The Ceratops Beds of Converse County. 

 II. The coal-bearing series of the Laramie 

 Plains. III. Localities in Bitter Creek 

 Valley — Block Buttes, Point of Rocks, 



Rock Springs. IV. Evanston and Hodges 

 Pass. V. Other localities considered — 

 Carbon, Wyo.; Crow Creek, Colo.; Coalville, 

 Utah. VI. Resume. 



(The undersigned (J. F. K.) learned 

 with regret, when it was too late to remedy 

 the matter, that no further abstract of the 

 above paper had been obtained. He had 

 thought it was read by title.) 



Geology of Northeastern Washington. I. C. 



Russell. 



The speaker described the remarkable 

 caiion of the Snake River and said it 

 equalled in grandeur the Grand CaSon of 

 the Colorado. There are walls 4,000 feet 

 high and a valley 15 miles across. 4,500- 

 5,000 feet of lavas have been cut through. 

 In the lavas secondary columnar fracturing 

 can be detected radiating from the centers 

 of primary columns and at right angles to 

 the faces of the latter. 



A Study of the Nature, Structure and Phytogeny 



of Dcemonelix. E. H. Baebouk, Lincoln, 



Neb. 



The new fossil Dsemonelix is a fresh -water 

 fibrous alga aggregated together into vari- 

 ous forms, the chief of which are large 

 regular upright spirals, sometimes with, 

 sometimes without an axis. These fossils 

 occur in every exposure in the Loup Fork 

 Tertiary on Pine Ridge, Sioux County, Neb. 

 They stand invariably upright in fairly co- 

 herent sand rock. Area about 500 square 

 miles. Vertical range about 200 feet. 

 Structurally Dsemonelix is cellular but not 

 vascular. It consists of simple parenchj'- 

 matous tissue without trace of fibro-vascu- 

 lar bundles. 



In its phylogenetic relations we can trace 

 apparent development from the simple 

 Dsemonelix ' fibre ' in the lowest beds, suc- 

 cessively through the Dsemonlix 'cakes,' 

 Dsemonelix ' balls,' Dsemonelix ' cigars ' or 

 ' fingers,' and the Dsemonelix ' irregular ' to 



