362 B. BROWN CRETACEOUS-EOCENE CORRELATION IN NEW MEXICO 



sandstone carrying on the lower side clay pebbles, Unios, and a few jaws, 

 teeth, and bones of mammals, identified as follows : 



1 



L ? Marsupialii 



Multituberculata : 



Meniscoessus sp. iudesc. 

 Ptilodus sp. 

 Cimolodon sp. 



Trituberculata : 

 Didclphops sp. 

 ? Batodon sp. 

 ? Thlwodon sp. 



? Gen. indesc. 



? Gen. indesc. I ? Inseetivora 



Pantolestidae gen, indet. 



? Creodonta 

 ? Taligrada 



The Miiltitiiberculates and Trituberculates are unmistakably those of 

 the Lance, but the placental mammals have not been found in the Lance 

 and appear to belong to the Paleocene groups of mammals, although 

 they do not compare closely with Puerco or Torrejon genera. This 

 layer was located in the l)luif at a point 150 feet above the river. Ap- 

 parently it was a local deposit, an old river channel of the Paskapoo 

 })eriod which crossed the present river at right angles. Twenty-five feet 

 above the mammal stratum there is a bed of shells 8 inches thick from 

 which Dr. T. "\V. Stanton has identified Unio sp., Sphcerium sp., Gonio- 

 hasis tenuicaiinuta M. and H., PJanorhis sp., Viviparus sp., Canipeloma 

 sp., which he says are suggestive of Fort Union rather than earlier forms. 



From Gaetz Yalley for a distance of 3 miles appears, first on one 

 side, then on the other, a nearly perpendicular cliff of massive brownish 

 sandstone nearly 100 feet high in places. Tt is composed of loosely 

 cemented rounded grains of quartz and feldspar, with a few lenses of 

 harder concretionary sandstone usually capping pillars of the softer 

 sandstone underneath. This sandstone overlies the lignite and belongs 

 to the Paskapoo series. It does not appear to contain fossils. 



Edmonton Formation 



Near the middle of range xxiv the first large coal seam appears on the 

 right bank at the water level. "This seam occupies the same geological 

 position as the big coal seam on the Saskatchewan River farther north, 

 namely, the top of the clays and sandstones of the Edmonton subdivision 

 of the Laramie, and it is not improbable that it is a continuation of the 



