188 TKANSACTIONS OF THE 1892] 



Albirupean Black Marl, while the latter contains only 

 lignite and fragments of the leaves of plants and trees. 



Below this part of the face of the Highlands the 

 "Lower Black Marl" continues to the bend of the shore, 

 and grows lower as it passes towards the ISTavesink river. 

 At its northwestern extremity the Albirupean Black Marl 

 is almost abruptly cut away by erosion, which made way 

 for the lowland west of the pier. A noteworthy corres- 

 pondence with the abrupt termination of the Albirupean 

 Black Marl on its northwestern border appears at three 

 or four points along its stretch southward, viz., near the 

 steamboat pier at the north end of Atlantic Highlands, 

 and at Bordentown, N. J., then at Grove Point, mouth of 

 Elk river, Md., and at the upper end of Round Bay, Md.- 

 These beds do not rise so high at Bordentown ; they are 

 not above forty feet high at Kincora, and they are still 

 lower at Fish House, above Camden, N. J. When, 

 however, we cross the greatly denuded level north of 

 Wilmington, Del., and reach the North East river in 

 Maryland, beds precisely like these occur in the body of 

 Maulden's mountain. Next southwest of this point they 

 are exposed along nearly the whole length of the Grove 

 Point bluff. Farther south they appear on the opposite 

 shore of the Sassafras river, and form the lower stratum 

 of its bluffs all the way down to Howell's Point. 



Crossing the Chesapeake bay, they appear in the same 

 succession on the Magothy river south of Cypress creek, 

 and they next appear in the same order of superposition 

 in the bluffs at the head of " Bound Bay," on the Severn 

 river. 



Tliis black marl is of the same type everywhere. It 

 is usually compact and not distinctly stratified, but occa- 

 sionally takes on a species of bedding in planes which 

 might be reo;arded as obscure stratification. 



The only remains thus far discovered in these black 



June 8. 



