MUSEUM OF COMPARATIVE ZOOLOGY. 281 



9, 10. Chapin (109, 111). Details in the same region. 



11, 12. Mather (PI. V., figs. 5 and 4). Dikes in the sandstone under 

 the Palisade trap, two miles south of Haverstraw, and near Verdrietje 

 Hook. 



13, 14. Mather (PI. XLV., figs. 3 and 2). Sections across Southern 

 New York and Northern New Jersey. 



15. H. D. Rogers (c). Across the Newark Mountains, Central New 

 Jersey. The interbcdded position of the trap is not shown. 



16. Emmons (6, 200; c, 107). PaHsade section at Slaughter's Land- 

 ing, showing intrusions between the beds below the main mass of trap. 



17. Lyell {c, 271). Dike in the Richmond Coal Field. 



18. Dawson (a, PI. V.). North shore of Mines Basin, opposite Two 

 Islands, Nova Scotia. Part of this section gives the appearance of a 

 post-Triassic overflow, but it is all described as contempoi-aneous. 



19. Lesley (a, 133). Hypothetical section illustrating the use of 

 " overflow " by Rogers as well as by the author. 



20. Hitchcock {g, PI. III.) Mount Tom, Mass., with incorrect in- 

 crease in thickness of the trap sheet as in fig. 7. 



21. 22. H. D. Rogers {g, II. 912, 691). Dikes at New Hope and 

 Gettysburg, Pa., producing metamorphism and cleavage. 



23. Id. {g, Geol. Map Pa., sec. 8). General section near Gettysburg, 

 Pa., showing post-Triassic eruptions. 



24. Emmons (</, sec. 1). Dike in North Carolina. 



25. Cook (6, 200). True scale section of the Palisades. The author 

 says this " fails to impress the mind " as one of the exaggerated sections 

 does ; but it certainly has the advantage of giving a true impression. 



26. Cook (a, sec. 1). East bank of Delaware by Lambertville, N. J. 

 There is some doubt as to whether these trap masses are sheets as hero 

 shown. 



27. Frazer {a, 298, sec. 11a). Dikes near Gettysburg, Pa. It is 

 not definitely stated in the context whether faults exist as shown in 

 this section. 



28. Leconte (440, 441). Hypothetical section of the Connecticut 

 Valley. If drawn on true scale the amount of erosion would be still 

 more enormous. 



29. Russell (c, 230). Hypothetical section of the New Jei-sey and 

 Connecticut Triassic belts, showing their supposed anticlinal relation. 



30. Id. (c?, 47). Section of the Palisade trap at Weehawken, N. J. 



31. Id. {d, 42). Ideal section of intrusive trap sheet. The descend- 

 ing branches seem to be of improbable occurrence. 



