52 



E. M. MUSEUM MEMOIRS. 



feet were six-inch layers of very hard sandstone. The character of tnese two 

 strata and the manner of weathering is rudely shown in the sketch in the upper 

 left-hand corner of the plate. It is designed to represent one of a cluster of tall 

 columns that stood out a hundred feet or more from the wall of the caflon. 

 The lower half was made up of the rock of stratum I. The upper half of 

 that of stratum II. Capping it was a huge block of very coarse brown sand- 

 stone, which clearly belonged to III. 



III. This was in three layers. The lower six feet was fine green sandstone, 

 streaked with bands of darker green, but weathering brown. Over this was a 

 layer one foot thick of very hard dark green clay, and over this in turn 17 feet 

 of coarse green sandstone that weathered brown. The grains of quartz com- 

 posing it were at least an eighth of an inch in diameter. The whole stratum 

 was full of fossils ; but the richest part was the band of green clay. Scattered 

 through this in every direction were leaves, reeds, water-grasses, and the skulls 

 of some carnivorous animals. No less than six heads or jaws were at one spot in 

 plain sight. But the clay matrix was exceedingly hard, the bones tender, and 

 the difficulty of getting them from the rock so great that, after repeated trials, 

 the attempt was given up. A number were, however, cut from the brown 

 layer and have since, by the skill of Franklin C. Hill, Curator of the Museum 

 been entirely removed from the stone. This stratum formed the top of a bench 

 as shown on the profile. 



IV. Nineteen feet of soft sandstone weathering pink. 



V. Two and a half feet of fine light green sandstone weathering brown and 

 full of concretions. Over this lay a bed 11.5 feet thick of green sandstone like 

 I. and weathering pink. 



VI. Six inches of bright green sandstone very coarse in grain. Four feet of 

 moderately coarse brown sandstone which broke up, under the influence of the 

 weather, into slabs. The brown color was not confined to the surface, but 

 extended through the rock. 



VII. On top of this was Z\ feet of sandstone similar to that of stratum 

 I., but coarser. The surface color was light pink. Two feet of dark green 

 sandstone, coarse in grain, streaked with bands of darker green clay and 

 weathering brown, completed the second bench. 



VIII. Seven feet of sandstone like that of II. 



IX. Twenty-two feet of soft sandstone like I. 



X. Two feet of coarse green sandstone similar to that of stratum VI., but 

 turning brown where exposed to the weather. Nine feet of soft clayey sand- 

 stone like II. 



XI. One foot of fine soft sandstone. On the surface the color was almost 

 white. But when wet, it turned green. Seven feet of sandstone like the lower 

 bed of X. 



