270 



Annals of the Carnegie Museum. 



beds referred to the Pernio- Carboniferous. This section was figured 

 in a former paper,' but detailed measurements were not given. The 

 more recent portion of this series of rocks is in McCarty's Mountain, 

 and probably includes both eruptives and Upper Cretaceous and Ter- 

 tiary rocks metamorphosed by heat. Below this in a descending 

 series are many hundreds of feet of sandstones, clays, and shales. 

 Fossils were not found in abundance, but toward the top of the series 

 there were a few fragmentary bones and impressions of plants. Below 

 this series are beds, which contain two or more bands of limestone 

 interbedded with shale. These beds, on account of their position 

 between the Jurassic and Colorado formations in other localities, have 

 been referred to the Dakota, but their position is doubtful. 



A large series of sandstones, clays and shales with meta^ 

 morphic rock near the top. 



Section on the Lower Big Hole River in Montana. 



Fort Union ? 

 Livingston ? 

 Upper Cretaceous. 

 Lower portions of Upper 38. Sandstones 

 Cretaceous, or Lower 37. Stales. 



Cretaceous. 36. A thin bed of limestone containing Unio, Goniobasis ? 



increbescens, and fish teeth. 

 35. Shales. 



34. Limestone in thin and thick layers — Wi/o (slender 

 form of U. douglassi Stanton), Corhiila, Gonio- 

 basis?, Vinparns. 

 T,'^. Red shales, etc. 



Feet. 

 32. Shale and sandstone 15 



31. Limestone. Some small fossils 15 



30. Shales green and red with one or more harder 



bands loo 



29. Shales and red sandstone. 30 



28. Gray sandstone, heavier bedded than the last 



below 45 



furassic. 27. Gray and reddish-gray shaly sandstone and shale.. 70 



' 26. Red shale. Fragments of bones of reptiles 55 



25. Red shale with nodules 50 



24. Red sandstone ^ 



23. Shale 



22. Thin band of sandstone 



Jurassic? and Triassic? 21. Red shale 



20. Sandy shale 



19. Gray sandstone J 



""Some Notes on the Geology of Southwestern Montana," by Earl Douglass, 

 Annai.s CARNEfiiE MusEUM, Vol. Ill, No. 2, 1905. 



60 



