132 KEMAKKS ON THE GEOLOGICAL DISTRIBUTION 



to be Sequoiarf. as far as can be told from thin sections of the wood sub- 

 mitted to Dr. L. Goodale. As is well known, remains of more than one 

 species of Sequoia have been found in the shales at their base. 



"From what information we could gain of the wells in this neighbor- 

 hood, it would appear that the present bed of the ancient Florissant lake 

 is entirely similar in composition for at least 30 feet below the surface, 

 consisting of heavily bedded non-fossiliferous shales having conchoidal 

 fracture. Above these basal deposits, on the slope of the hill, we found 

 the following series from above downward, commencing with the evenly 

 bedded strata: 



"Section in Southern Lake — By S. H. Scudder and A. Lakes. 



Ft. In. 



1. Finely laminated, evenly bedded, light-gray shale; plants and 



insects scarce and poorly preserved 1 2 



2. Light-brown, soft and pliable, fine-grained sandstone; unfossil- 



iferous 2 



3. Coarser, ferruginous sandstone; unfossiliferous... 1 4 



4. Resembling No. 1, leaves and insect remains 8 2 



6. Hard, compact, grayish-black shale, breaking with a conchoidal 



fracture, seamed in the middle with a narrow strip of drab 

 shale; fragments of plants 11 



6. Ferruginous shale ; unfossiliferous 5 



7. Resembling No. 5, but having no conchoidal fracture; stems of 



plants, insects, and a small bivalve mollusk 3 4 



8. Very fine gray ochreous shale ; non-fossiliferous 2 



9. Drab shales, interlaminated with finely divided paper shales of 



a light-gray color; stems of plants, reeds, insects 18 



10. Grumbling ochreous shale; leaves abundant, insects rare 3 



11. Drab shales; no fossils 3 



12. Coarse ferruginous sandstone ; no fossils I 4 



13. Very hard drab shales, having a conchoidal fracture and filled 



with nodules; unfossiliferous 24 7 



14. Finely laminated yellowish or drab shales; leaves and fragments 



of plants, with a few insects 11 6 



