PALAEONTOLOGY : EASTERN MASSACHUSETTS. 45 



Pleistocene : 



Moraine of Martha's Vineyard and Block island. 



Unconformity. 



Tisbury beds (not well exposed). 



Unconformity. 



Sankaty sands and gravels. 



Lower boulder bed. 



Unconformity. 

 Pliocene : 



Pliocene sands. 



Unconformity (inferred). 

 Miocene : 



Foraminiferal or Greensand beds. 



Unconformity. 



Osseous conglomerate. 



Unconformity. 

 Cretacic: 



Marine upper Cretacean. 



Unconformity (inferred). 



Non-marine plant-bearing beds (regarded by Marsh as Ju- 

 rassic). 



Jurassic (?) or lower Cretacean. 



These are the lowest beds exposed at Gay Head. White in 

 1889 collected Cretacic plants in large numbers. The best were 

 obtained " (1) from argillaceous concretions in the lignites and 

 carbonaceous clays, (2) from the clay and clay-ironstone con- 

 cretions in the reddish and gray clays, and (3) rarely from the 

 concretions and the limonite matrix of the ferruginous conglom- 

 erates on the western escarpment. " l The plants include cryp- 

 togams, conifers, monocotyledons, dicotyledons, and numerous 

 fruits. The most important species are : 



Sphenopteris grevillioides Hr. 



Sequoia ambigua Hr. 



Andromeda parlatorii Hr. 



Myrsine borealis Hr. 



Liriodendron simplex Newb. 



Eucalyptus geinitzi Hr. 



Sapindus cf. morrisoni Lx. 



1 White, loc. cit., p. 97. 



