114 7 GEOLOGY. 
Feet. 
28. Whitish clays and claystones, with a thin layer of hard compact gray limestone 
near the middle. Locality same as last-- +--+ ++ ++ ++ ee ee cere eee teen eeee 10 
29. Light-greenish indurated clays. Same locality ++--++++++++eerereeereeecees 3 
30. Hard, heavy bedded, white argillaceous limestone, containing Monotis and Avi- 
cula. Ogden Ferry, ee ee TRAE oes & 540d wee ee nas bs 6 5 00 5.0 bee 5 ok 5 
31. Very thinly laminated dark-green shale. Three miles nearly east of ou 
Ferry, on McDowell's creek; also at Manhattan, on the Kansas.++++++++++++++ 1 
32. Light-greenish and flesh-colored hard argillaceous limestone, with Spirifer cam- 
eratus. This is the highest horizon at which we found this species. Same 
ios) 
aw 
3. Alternations of bluish, green, and red more or less calcareous laminated clays, 
light gray limestones and claystones, with Pecten, Monotis and fragments of 
fee Pee, ED CRIES Foo 08 eg ces or a ae & wee os PP ee ee ch ween Sed 30 
. Alternations of bluish, purple, and ash-colored calcareous clays, passing at places 
into claystones, and containing in a thin bed, near the middle, Spiri/er plano- 
convexa, Spirigera subtilita, Productus splendens? Rhynconella uta, kc.  Local- 
oo 
roe 
ity same as preceding Fe See DU ye eas Foe pt oer a stece Seo ka pate , eek Eber 12 
35. Blue, light-gray, and greenish clays, with occasional harder seams and layers of 
claystone and limestone. Same locality ee ee oe oe ek ea oS ee 33 
36. Somewhat laminated claystone of light-gray color, with more or less cale spar 
near lower part. Manhatian.--. o-- 0 see cece cer ectes er cesescee obs vanes 19 
37. Alternations of dark-gray and blue, soft decomposing argillaceous limestone, 
with dark laminated clays, or soft shale, containing great quantities of Fusulina 
cylindrica, F. eglindrica, var. ventricosa, Discina Manhattanensis, Cheetetes, and 
fragments Crinoids; also, Chonetes Verneuiliana, C. mucronata, Productus splen- 
dens? Retzia Mormonii, Rhynconella uta, Spirigera subtilita, Spirifer cameratus, 
8S. plano-convexa, Evomphalus, near HE. rugosus and Se biserialis; also 
Cladodus occidentalis. Locality same as last.........- 18 
38. Soft bluish shale, with yellow laminated arenaceous seams aie ere 
Fucoidal markings. Same locality «+--+ ..005+ cecece scesscseeees corenesees 25 
39. Two layers gray argillo-calcareous rock, separated by two feet of dark green 
and ash-colored clays. The calcareous beds contain fragments of Crinoids, 
Chonetes, and Myalina of undt. species. Same locality as last-.----++++++>: 44 
40. Light-greenish, yellow, and gray clays and claystones, extending down ae 
to high-water mark of the Kansas, opposite the mouth of Blue river-.---+++-- 27 
By comparing this section with those which I have before given of the rocks intermediate 
in age, between the Carboniferous and Cretaceous formations in New Mexico, particularly those 
exposed on the Little Colorado*, it will be seen that the differences are very marked, and that 
from lithological characters it is impossible to work out the parallelism with any certainty. 
The sections given of the strata between the base of the Cretaceous mesa at the Mogui 
— and the Carboniferous limestone west of the crossing of the Little Colorado, p- 
; that at Fort Defiance, p ; at Agua Azul, p. ; at Pecos village, 
and at Ojo Vernal, all represent on same geological horizon, and yet how different in all es 
divisions and details ! 
These facts will illustrate the eae of deductions made from lithological characters, 
and show the necessity for waiting the discovery of fossils in the almost fossilless rocks occupying 
the — = the Permian, Triassic, and Jurassic formations west of the Rio Grande, before a 
— VIII of this Report. 
