PACKARD. — RHODE ISLAND CARBONIFEROUS. 405 



number of marine animals, viz.. Belinuridte (Euproops, Prestwichia and 

 Belinurus), besides Anthrapaloemon and Acanihotelson, together with 

 the impressions of marine annelid worms. 



It should be observed that the black plant-beds of Providence on the 

 western side of Providence Bay, which dip southeastward at an angle of 

 45 o -50°, extend over to the arkose conglomerates on the western edge 

 of the basin, which are very highly inclined and dip westwards. The 

 thickness of the plant-beds, unless much folded, appears to be over a 

 mile. The exact relations of the plant-beds on the eastern side of 

 Providence to the arkose conglomerates we have thus far been unable to 

 definitely determine.* 



Brown University. 



* Since reading this proof I have, at a point about half a mile north of Natick, 

 on the western edge of the coal basin, seen the gradual passage of the carboniferous 

 shales into the arkose. 



