8T.J0IIN.] FALL CREEK EEGION. 365 



inclination S. 55° "W., at an angle of 47°. (15) Gray sandstone, break- 

 ing into cubical blocks, laminic showing a dip of 35°, N. 35° E°. (IG) 

 Gray, thin-bedded or shaly laminated sandstone, rusty buff Aveathered, 

 forming a heavy deposit 50 to 80 yards across its outcrop, and dipping 

 32°, if. 40° E. (17) Gray-buff, thin-bedded, laminated sandstone, ex- 

 posure 20 yards across, dip 35°, N. 40° E. (18) Gray laminated sand- 

 stone, exposure 15 yards across, dip 30° to 40°, N. 5° W. to N. 45° E. (19) 

 Dark gxay, thin-bedded, spar-seamed sandstone, 20 yards across expo- 

 sure, dip same as last. North of the last exposure a shallow sag, several 

 hundred yards across, intervenes between the higher and lower levels 

 of the bench, in which occur obscure exposures of (20) reddish sliales with 

 calcite and selenite. In the upper edge of the lower platform appears 

 (21) a narrow ledge of soft, thin-bedded, spar-seamed, gray sandstone, 

 5 yards across its exposed edges, dip 60° to 70°, S. 50° AV. (22) Gray, 

 thin-bedded sandstone, very obscure exposure, at one point apparently 

 dipping northeastward at an angle of 30°, the broken outcrop 10 yards 

 across. (23) Coarse gray sandstone, associated with a 2-foot layer of 

 bricciated or conglomeritic limestone comi)osed of small fragments of 

 drab limestone, dipping at angle of 75°, S. 50° W. This bed is included 

 in reddish shales with calcite and gray sandstone. (24) Compact lam- 

 inated gray sandstone, 5 yards across the exposure, dip 30°, IST. 45° E. 

 (25) Gray, fragmentary, spar-seamed sandstone, 2 feet, underlaid by a 

 thin band of sandstone associated with red and drab shales, dip 25°, jST. 

 35° E. (26) Gray limestone debris in low swell, associated with reddish 

 shales containing calcite, and nodules or j^ebbles of reddish stained and 

 drab limestone in intermediate space. Thence to the brink of the bench 

 the surface reveals only obsciu'e exposures of (27) reddish shales with 

 perhai)s intercalated soft gray sandstone. In the face of the terrace- 

 bluff on the west side of the Fall Creek intervale, a considerable thick- 

 ness of (28) red and blue shales, with a heavy-bedded layer of gray sand- 

 stone, was seen, the beds dipping at a moderate angle northeastward, 

 and reappearing, or a part of the same series, in the opposite bluff. 



In the last series of strata mentioned above, beds 11 to 28, inclusive, 

 conclusive evidence is furnished on their disturbed condition. But the 

 repetition of similar strata, together with their generally indifferent ex- 

 posure, did not allow the tracing out of actual identity of any stratum 

 at different points, except along the outcrop of the same ledge. Hence, 

 it is impossible to construct such a section as shall represent actual strat- 

 igraphic continuity, though we may endeavor to represent, approximately, 

 the position of the strata in their folded condition, the inferences for 

 which disposition may be consulted in the diagram illustration of the 

 above section. From this it is apparent that, mthin the space between 

 Station XIX ridge and Fall Creek, these deposits have been thrown up 

 in two quite sharj) folds ; and it is further probable that they succeed 

 the strata of the latter locality conformably, the folds to the north sud- 

 denly showing more gentle dips, which might, indeed, almost suggest 

 the interposition of nouconfomity iji explanation of their relative position. 

 The southernmost series of strata included under No. 1 of the* above 

 section ai^parently belongs to the similar series occurring to the west 

 of Station XVIII ridge ; and it seems equally probable that the fold, 

 the axis of which is represented by No. 3, also corresponds to the axis 

 of the fold to which the beds of the latter locality belong. Hence, 

 the limestones No. 6 and No. 8 evidently occur at a much higher hori- 

 zon than that affording the vertebrate fossils at Station XVIII, from 

 which the Laramie age of the associated strata at the latter locality is 

 inferred. But besides these, whose fossils unfortunately do not admit of 



