18 PROCEEDINGS OF THE ACADEMY OF 



28. Whitish clays and claystones, with a thin layer of hard compact 

 gray limestone near the middle. Locality same as last 10 



29. Light greenish indurated clays. Same locality.. 3 



30. Hard, heavy bedded, white argillaceous limestone, containing Mono- 



lis and Avicula. Ogden Ferry, and below there 5 



31. Very thinly laminated dark green shale. Three miles nearly east of 

 Ogden Ferry, on McDoioelVs creek ; also at Manhattan, on the Kansas 1 



32. Light greenish and flesh-colored hard argillaceous limestone, with 

 Spirifer cameratvs. This is the highest horizon at which we found this 

 species. Same localities 3 



33. Alternations of bluish, green, and red more or less calcareous lami- 

 nated clays, light gray limestones and claystones, with Pecten, Monotis and 

 fragments of Crinoid columns. Same localities 30 



34. Alternations bluish, purple, and ash colored calcareous clays, passing 

 at places into claystones, and containing in a thin bed near the middle, 

 Spirifer planoconvexa, Spirigera subtilita, Productus splendens? Rhynchonella 

 Uta,kc. Locality same as preceding 12 



35. Blue, light gray, and greenish clays, with occasional harder seams 

 and layers of claystone and limestone. Same locality 33 



36. Somewhat laminated claystone of light gray color, with more or less 

 calc spar near lower part. Manhattan 19 



37. Alternations of dark gray and blue, soft decomposing argillaceous 

 limestone, with dark laminated clays, or soft shale, containing great quan- 

 tities of Fusulina cylindrica, F. cylindrica, var. ventricosa, Discina Manhattan- 

 ensis, Uhoztetes, and fragments Crinoids; also, Choneles, Verneuiliana, C. mucro- 

 nata, Productus splendens? Retzia Mormonii, Rhynchonella Uta, Spirigera subti- 

 lita, Spirifer cameratus, S. planoconvexa, Euomphalus, near E. rugosus and 

 Synocladia biserialis ; also Cladodus occidentalis. Locality , same as last 18 



38. Soft bluish shale, with yellow laminated arenaceous seams below, 

 containing Fucoidal markings. Same locality 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... 4J 



40. Light greenish, yellow, and gray clays and claystones, extending 

 down nearly to high water mark of the Kansas, opposite the mouth of Blue 

 River 27 



The foregoing general section of the strata seen along the valley of Kansas 

 and Smoky Hil! rivers, from the mouth of Blue river to the 98th degree of 

 west longitude, is presented in its present form more with a view of illustrat- 

 ing the vertical range of the organic remains found in these rocks, than as an 

 attempt to group the beds into formations that may be expected to preserve 

 their distinctive lithological characters throughout areas of any great extent. 

 As this has necessarily been done from a knowledge of only a portion of the 

 fossils characterizing these strata, it is quite probable, when more extensive 

 collections are obtained, that it may be found necessary even on this principle, 

 to classify and group the beds somewhat differently. We are also aware that, 

 some of these beds probably increase or diminish greatly in thickness, or may 

 even entirely thin out, at no very great distances from the localities where we 

 saw them. 



Among the more peculiar features of the series of rocks represented by this 

 general section, and in part by the preceding local sections, may be mentioned 

 first, the great number of thin layers and beds ; and secondly, the frequent 

 repetition of similar beds at various horizons. Again, the almost entire ab- 

 sence of heavy massive strata of limestone, or other hard material possessing 

 sufficient durability to form perpendicular escarpments of much extent, is 

 worthy of note. As a general thing, the limestones vary from only a few inches 

 in thickness, to from one to three or four feet, and rarely, as in Nos. 14 and 18, 

 attain a thickness of from thirty-eight to forty feet. Although various light 

 colored laminated clays, and soft argillaceous shaly beds predominate, and 



[Jan. 



