66 J. A. UDDEN 



ently resting on the eroded surface of the Cedar Valley lime- 

 stone. At the base of this clay there is a thin layer of more 

 stony material, and this contains specimens of Ptychtodas calceo- 

 lus and other small fish teeth. This is the basal layer of the 

 Sweetland Creek beds. About one half mile farther up the same 

 creek near the north line of section 23, in Montpelier township, 

 just below a small fall in the creek, the following section is 

 seen. 



Number Feet 



13. Coal Measures. 



12. Dark bituminous shale with two or three bands of green shale ; the 

 dark next the green exhibiting a complex network of thread- 

 like green extensions from y 2 to 2 mm in thickness, lying approx- 

 imately parallel with the bedding. Occasional lingulas found 1 

 11. Dark bituminous shale with small spheroidal crystalline nodules of 



pyrites, occasional lingulas and Sftathiocaris emersoni - - 2 

 10. Concealed (next number a few rods farther down) - - 2 ? 



9. Light greenish shale --------- 1 



8. Dark olive-gray shale ........ y^ 



7. Green shale .......... 2^ 



6. Greenish calcareous shale, almost stony, containing cylindrical or 



flattened fucoid markings slightly more greenish than the matrix f 

 5. Dark gray shale ---------- 1 



4. Grayish-green pyritiferous rock with minute fragments of unrecog- 

 nizable fossils ......... 1^ 



3. Dark gray shale - - - - - - - %. 



2. Greenish-gray somewhat stony shale exhibiting concretionary con- 



choidal fractures when weathered -----% 



1. Greenish-gray argillaceous and pyritiferous fine-grained dolomitic 

 rock in layers a few inches in thickness, with fucoid impregna- 

 tions or markings like those in number 6, % inch in diameter - 1 % 



At the south end of this outcrop there is a small displace- 

 ment in the ledges, which, dipping at a considerable angle south 

 of it, soon disappear under the Coal Measures. The displace- 

 ment is no doubt local and probably due to the falling in of 

 some cavern in the underlying limestone. 



Westward for the next three miles these beds do not appear, 

 although the contact between the Coal Measures and the Cedar 

 Valley limestone frequently comes into view. In the Pine Creek 



