204 



GEOLOGY OF THE NAERAGANSETT BASIN. 



Lesquereux, is peculiarly rich in species of Odontopteris. As yet the upper 

 portion of the Coal Measures, from near the base of the Dighton group 

 upward in the northern field, has afforded little or no evidence. From the 

 list of localities which appear to have been visited in collecting the fossils 

 in Lesquereux's list it is possible to draw conclusions of some value regard- 

 ing the flora so far as it is known. 



The localities, so far as the Providence quadrangle is concerned, are 

 practically limited to the exposures which occur in the lower half of the 

 series of sandstones and shales of the Coal Measures, or to essentially the 

 same range as the insect fauna. Lesquereux 1 concluded from these plants 

 that the Rhode Island Coal Measures were equivalent to the beds of the 

 upper Carboniferous in Pennsylvania. Until the flora of the uppermost 

 members of the period in this basin is known nothing further can be said 

 regarding their Permian affinities. (See also pp. 170, 181.) 



List of plants identified by Leo Lesquereux.' 2 



■Am. Jour. Sci., 3d series, Vol. XXXVII, 1889, p. 411. 

 -Ibid., p. 229. 



