Xiv ILLUSTKxYTIONS. 



Paee. 



Fh.. 5. Illustration of unconformity near Golden 99 



6. South Boulder Peaks, twinned bj faull 115 



7. South Boulder Peaks fault in Bear Canyon 116 



8. Section through Burn! Knoll 123 



:•. Section across Coal Creek syncline at Louisville 125 



10. Section through nor I iiern and middle faults, Marshall system 129 



1 1. Section through North Boulder faults 136 



1l'. Seotion of coal measures of lower division of Laramie at Coal Creek 338 



13. Section of coal lienchcs, Davidson Mesa and northward, east of Marshall :il(l 



II. Sect ion of coal benches, 1 >avidson Mesa, Davidson district 342 



15. Section of coal measures, Marshall district 346 



16. Section of coal measures of upper Laramie at Scran ton 375 



17. Ideal section illustrating the chief requisite conditions of artesian wells 405 



is. Section illustrat ing the thinning out of a porous water-bearing bed 405 



19. Section illustrating the transition of a porous water-bearing bed into a close-textured 



impervious one 405 



20. section intended to illustrate the aid afforded by a high water-surface between the 



fountain-head ami t lie well 409 



21. Mould.' section illustrating the effects of high and low water-surface in the cover-area. 409 



22. Section of barrier clays 412 



23. Section to illustrate horizons of \ ertebrate fossils 171 



24. Map of Converse county. Wyo., showing localities where skulls of Ceratopsidse have 



been discovered 178 



:.'."•. Outline restoration of left fore leg of Hallopus \ iotor Marsh _ 482 



26. Outline restoration of left hind leg of same individual Is2 



27. 1 'entary bone of \ juosaurus agilis Marsh : seen from the left IS1 



28. I Ilium of same individual ; left side IS1 



29. I .eft femur of Nanosaurus rex Marsh 484 



30. I eft hind paddle of Baptanodon discus Marsh 186 



31. Cervical \ ertebra of Baptanodon natans Marsh 486 



82. Posterior oervical vertebra of Pantosaurus striatus Marsh 486 



83. Sacrum of Atlantosaurus montanus Marsh ; seen from below I ST 



34. Left femur of Atlantosaurus immanis Marsh; innerview 188 



34n. Proximal end of same 188 



35. The same hone ; front view 488 



35a. Distal end of same 488 



36. ( lervical vertebra of Lpatosaurus laticollis Marsh ; back view 190 



e7. Sac- rum of Apatosaurus ajax Marsh ; seen from below 490 



38. Pelvis of Apatosaurus ajax; Been from the left 491 



39. fooili of Brontosaurus excelsus Marsh 492 



10. Sixth eer\ ical vertebra of Brontosaurus excelsus; front view 192 



11. The same vertebra ; bottom viot 192 



12. I lorsal vertebra of Brontosaurus exoelsus; side view 193 



13. Fourth caudal \ ertebra of Brontosaurus excelsus; side \ iew 193 



II. skull of Diplodocns Ion- us Marsh; side view 195 



15 Mi ■ 1 1 i.ii \ teeth of Diplodocus longus; side view 195 



hi. Chevron of Diplodocus longus ; top and side views 195 



