186 TKAJSrSACTIONS OF THE [1892 



the Raritari river, N, J., wliicli agrees with specimens 

 from near Bordentown ; likewise from Kincora, N. J., 

 from the shores of Chesapeake bay, Md., near the Elk 

 and Sassafras rivers ; from the Severn river, on both 

 shores of Round Bay, and from the strata near the Mago- 

 thy river, south of Cypress creek, in Anne Arundel 

 county, Md. All of these localities afford, either from 

 the pale clays of the Alternate Clay-Sand series, from the 

 darker or black clay within this series, or from the dark 

 or marbled white clay in either the upper or low part of 

 this groups of beds, a iiora which may be represented by 

 Araliopsis, Cornus, Myrica^ a peculiar Sassafras, Fico- 

 phyllum related to eucalyjytoides, a small-leaved Rogersia, 

 Protojphyllum, and many other genera and species of 

 Dicotyledonous plants — as a whole, presenting a facies 

 much like that of the Dakota group as described and rep- 

 resented by Mr. Lesquereux, in Yol. YI of Dr. Hayden's 

 Report of the U. S. Geological Survey of the Territories, 

 1874. 



Thus far no Cycads or very lowly organized Angio- 

 sperms have been taken from the undisturbed beds of this 

 series. 



Protaeaephyllum, Celastrophyllum, Yitiiyhyllum, and 

 the other types found in tlie beds associated with the iron 

 ore clays, and representative of the Potomac formation, 

 find no place in the Albirupean deposits. 



A long interval of erosion and disj^lacement of beds 

 must have followed the deposition of the " Yariegated 

 Clays," for the clays and mixtures of which they form the 

 upper member have been eroded almost to base line over 

 wide areas in Baltimore and Anne Arundel counties, 

 besides the localities where the Potomac strata are con- 

 spicuous in Harford and Cecil counties, Md. 



Starting from the shores of the Raritan bay and pur- 

 suing a course from the vicinity of Matawan creek in a 



