392 MESOZOIC FLORAS OF UNITED STATES. 



We saw no reason to question the Older Potomac age of the lower beds 

 at Fayetteville, as desci'ibed above, and it now seems certain that such 

 beds occur at many points in that general region, although, unfortunatelj^, 

 no paleontological evidence has yet been found. 



Several papers relating in one way or another to the Older Potomac 

 appeared during the year 1895. 



In a paper in Science" I gave the results of my examination at Aix 

 and Fonscolombe in Provence, France, in August, 1894, of the material 

 collected in Portugal b}^ M. Paul Choffat, and sent to the Marquis Saporta 

 at Aix for determination. It contained archaic dicotyledons from the 

 Lower Cretaceous, about which the Marquis had written me and which 

 I greatly desired to see. I found his work nearly ready for distribution 

 and I received it soon after my return to America. This paper is prac- 

 tically a review of that work, with special reference to the American 

 floras that most closely correspond to those of Portugal. 



In the same number of Science (p. 362) there is an unsigned note, 

 which is known to have been contributed by Mr. F. A. Lucas, on the 

 vertebrate remains that had recentty been discovered by Mr. Bibbins in 

 the Potomac formation of Maryland. These represented the genera 

 Allosaurus, Pleurocoelus, and Priconodon, and also contained a tooth of 

 Astrodon Johnstoni Leicly. 



Doctor Knowlton contributed an article on the pi'imitive dicotyledons 

 of the Potomac ^ to the Popular Science News for April and May, 1895, 

 calculated to popularize this important branch of the subject. 



Mr. Bibbins's paper '' in the Johns Hopkins LTniversity Circular, No. 

 121, gives a clear summing up of his studies in the formation. 



Mr. Benjamin Smith 'Lym&rv'^ reported probable Older Potomac 

 beds in Pennsylvania, on Neshaminy Creek, near the mouth of Mill Creek, 

 in the southern edge of Northampton Township, and at Sunny Hill 

 schoolhouse, near the mouth of Core Creek, in Middletown Township, 

 thus confirming the observations of Mr. McGee, as well as those of Mr. 



« The Mesozoic flora of Portugal compared with that of the United States, b}' Lester F. Ward: Science, 

 n. s., Vol. I, March 29, 1895, pp. 337-346. 



* The oldest dicotyledons, by F. H. Knowlton: Popular Science News, Vol. XXIX, New York, April, 

 1895, pp. 49-51; May, 1895, pp. 66-68, illustrated by 20 text figures. 



<; Notes on the paleontology of the Potomac formation, by Arthur Bibbins: Johns Hopkins University 

 Circulars, Vol. XV, No. 121, Baltimore, October, 1895, pp. 17-20, one plate. 



'' Report on the New Red of Bucks and Montgomery Counties, by Benjamin Smith Lyman: Pennsylvania 

 State Geological Summary Final Report, Vol. Ill, Part II, 1895, pp. 2634-2635. 



