U. S. GEOLOGICAL SURVEY 



MONOGRAPH 55 PLATE XI 



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A. NORTH FACE OF BEAVER DIVIDE, WIND RIVER BASIN, WYO. 

 View we^^vard from point near Wagonbed Spring, showing lo\ver Oligocene beds (.Titanotherium zone), with Menodus heloceras 

 (level Chadron A), reding on upper Eocene {'Diplacodon sone?). Skull provisionally referred to Amynodon antiqutis was 

 taken from left foreground. (After Granger, 1910.1.) Am. Mus. negative 18388 



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B. EXPOSURES AT WAGONBED SPRING, BEAVER DIVIDE, FREMONT COUNTY, WYO. 

 Sho\ving contact between upper Eocene and lower Oligocene. The skull of Menodus heloceras came from the dra-w ju^ to the right 



of this view. Am. Mus. negative 18391 



LOWER OLIGOCENE OVERLYING UPPER EOCENE OF CENTRAL WYOMING 



