MUSEUM OF COMPAiiATIVE ZOOLOGY. 



309 



EXPLANATION OF PLATES. 



Tins article is accompanied by three plates, numbered IX., X.,and XL, witli fifty- 

 two figures, numbered coiisecutivGly. 



Plate IX., figs. 1-31, gives u general graphic review of the opinions held concerning 

 the relations of the trap and sandstones from 1818 to 18^0. The references to the 

 originals of the drawings are given on pp. 280, 281. 



^ Plates X. and XI. Sketch-maps serving as guides to the localities of the observa- 

 tions above described, and figures representing some of the results obtained. Page 

 numbers refer to explanations in the text. 



Kig. 32. Turner's Falls, M^ass. Fig. 33. Section of trap ridges (p. 259). Fig. 34. 

 FraguKints of trap in overlying sandstone (pp. 2G0, 300). 



Fig. 35. About Mount Tom, Mass. (p. 261). Fig. 36. Section of Mount Tom and 



posterior ridge (p. 261). Fig. 37. Generalized section of contact, Delany's Ouarrv 



(p. 262). ^ 



Fig. 38. Kailroad cut in posterior trap ridge. West Springfield, Mass. (p. 263). 



Fig. 39. Map and section of curved trap ridge at Beckley Station, Middletown 

 Branch Railroad, Conn. (pp. 264, 265, 306). 



Fig. 40. The Hanging Hills from Meriden (p. 265). Fig. 41. The same in section 

 (p. 266). Fig. 42. Map of the same (p. 266). Fig. 43. The same with Lamentation 

 Mountain, as seen from Wallingford, Conn., showing place and throw of probable 

 fault (pp. 2G6, 305). 



Fig. 44. Dikes near East Haven, Conn. (pp. 268, 292). 



Fig, 45. Side of ragged dike, Wallingford, Conn. (p. 26G). 



Fig. 46. Base of Palisade trap cutting sandstone, Weehawken, N. J. (p. 270). 



Fig. 47. Garret Rock, First Mountain, Paterson, 1^. J. (pp. 273,304). Fig. 48. 

 Gorge at Passaic Falls, Paterson (pp. 272, 300). 



Fig. 49. Pecidiar conglomerate overlying First Mountain tra^"), Feltville, N". J", 

 (p. 275). Fig. 50. a, b, the same, natural size (p. 275). 



Fig. 51. Intruded trap sheets, Martin's Dock, below New Brunswick, N. J 

 (pp. 276, 295). 



Fig. 52. Intruded trap sheets, near Point Pleasant Station, Belvidcre Railroad, 

 K. J. (pp. 277, 295). 



