GEOLOGY OF THE LARAMIE PLAINS 



F. buccinoides, F. Culbertsoni, Anisomya borealis, Limatia 

 occidentalis, Chemnitzia centhiformis, Limopsis paraoul, 

 Jixinea subimbricata, Cardium speciosum, T^teria ioxyiomia) 

 ereda, 'P. perpleura, 'P. linguiformus, r^adra nitidula, 

 ^J^ucula subplana, Pteria gastrodes, Yoldia sdtula, Y. 

 eVansi, Pteria fibrosa, Trigouarcar obliqua, Endocostea 

 typica, Inoceranus alius, I. Howelli, I. crispii, Itenudineatus, 

 I. Balchii, I. tenuirostratus, I. Vanuxemi, I. problematicus, 

 I. deformis, I. Sagensis, I. proxinus, I. Simpsoni, I. barabini. 



The indurated Fox Hills strata are often entirely made up 

 of Inocerami, some very large. 



The following is a section of strata seen in the Como anti- 

 clinal: 



1 . 45 feet of mosdy brown sandstone forming the crest 



of the hill— Dakota. 



2. 55 feet of shales, may also be Dakota. 



3. 2 feet gray sandstone. 



4. 60 feet marine Jurassic. Soft gray and chiefly a sandy 



clay. 



5. 5 feet of red shales. 



6. 1 feet of yellow sandstone, 



7. 5 feet of red shales. 



8. 1 feet of yellow sandy layers. 



9. 44 feet of red banded beds. 



Contains thin calcite plates. 



10. 18 feet of blue laminated clay. 



11. 5 feet, one bed of gray sandstone. 



12. 18 feet of blue shales, with occasional solid layers. 



Contains plates of calcite. 



13. 6 feet of yellow sandstone. 



1 4. 250 feet of dark, soft laminated shales. 



—29— 



