286 



Annals of the Carnegie Museum. 



Sections of White River Beds in the Little Bad Lands, North Dakota. 



7. Quite hard gray sandstone 10 ft. 



6. (iray clays and shales graduating vertically 

 and horizontally into sandstones, which crack 

 Upper White horizontally, but do not show distinct planes 

 River. "i of stratification. Some sandy concretions in 

 places. Rhinoceros bones in sandstone. In 

 clayey beds near bottom, Merycnidodonts with 

 large bullae, Mesohippus, lizards, etc 40-50 ft, 



5. Pink clay, sometimes sandy, with brown nodules 



as in No. 2 below 5-10 ft. 



4. Stratified sandstones and sandy clays 10-15 ft. 



3. Greenish band. Character of rock much the 



same as No. 2, except in color 2-3 ft. 



2, Clays, pink on weathering, containing brown 

 nodules, which on exposure to the atmosphere 

 become cellular on account of the removal of 

 softer particles ; these nodules were numerous 

 near top and bottom. In the lowest portion, 

 in some places, are large concretionary masses 

 of barite. The lower third is the most fossil- 

 iferous band in the series and contains many 

 Middle White skulls and other bones of Ic/ops, hchyromys^ 

 River. | Pahtolagus, Jl/eso/nppiis, /Rhinoceros, Hytaco- 

 dott, Merycoidodon culbertsotti, Leptomeryx, 

 Poebrotheriuni and others. The Merycoido- 

 donts, so far as observed, have small tympanic 

 bullae. Fossils both in nodules and clay. In 

 the upper third are turtles and a few remains 

 of mammals, Rhitioceros, Hyracodon (?) and 

 Euc7-otaphus dickinsonensis with large tym- 

 panic bullae 50-60 ft. 



I. Gray to almost white sands and sandy clay con- 

 taining considerable silicified material near the 

 top and many rounded and smooth water-worn 

 pebbles and brown iron-stained concretions in 

 Lower White the lowest exposures. The sand grains are 



River. ] usually pure, clear white quartz. Exposure 



something like forty or fifty feet in thickness... 40-50 ft. 

 In the lower portion of No. i fragments of bone 

 and fossil wood were found. Among the 

 former are scutes of crocodiles. 

 Total thickness of section nearly 200 ft. 



The Lower White River deposits extend for a considerable distance 

 east and northeast of the Little Bad Lands. On superficial exaniina- 



