176 



THE CERATOPSIA. 



Among the ceratopsian remains mentioned are those of Ceratops and Monoclonius, and it 

 was here, or in this vicinity, that type material referred to Ceratops paucidens Marsh was found, 

 the exact locality being — 



on the western slope, very near the summit, of a rounded badland hill about 20 rods east of the spring situated about one- 

 quarter of a mile cast of the |freight road running from Judith to Maiden, Mont., * * * about 12 miles from Judith post- 

 office, on the Missouri River. [See this monograph, p. 103.] 



The type of . Ceratops ( Monoclonius) recurvicornis Cope was found in a bluff on the north 

 side of Missouri River nearly opposite the mouth of Dog Creek, in Montana. According to 

 Cope the geological horizon was near the base of the Judith River beds as these are represented 

 in this locality. 



BIRCH CREEK. 



Birch Creek rises in the Bearpaw Mountains and flows southward, emptying into the 

 Missouri River nearly opposite the mouth of Dog Creek. The walls of the canyon of Birch Creek 

 .are composed of Judith River and underlying formations, while the hills on either side of the 



Tig. 121.— Undisturbed Judith River 



>eds, with overlying Bearpaw shales, on Cow Creek, Montana, 

 contact is below the pine trees on ridge in middle distance. 



After Stanton and Hatcher. The 



canyon are formed of the Bearpaw shales. It was from the sandstones near the base of the 

 Judith River beds near the mouth of Birch Creek that Professor Cope, in 1876, secured the type 

 of Monoclonius crassus. 



The type of Monoclonius sphenocerus Cope was found by Charles H. Sternberg on the 

 Missouri River near Cow Island, Montana; level not recorded. 



cow CREEK. 



Cow Creek, which yielded the type of Ceratops montanus Marsh, flows south from the 

 Bearpaw Mountains, emptying into the Missouri about 30 miles below Judith post-office. 



Cow Creek flows in a deep, rugged canyon from a place a short distance below the point where it leaves the Bearpaw 

 Mountains to its confluence with the Missouri. * * * The bluffs on both sides of Cow Creek for several miles above its 

 mouth are made up largely of rocks belonging to the Claggett formation, overlain by the lighter colored materials of the 

 Judith River beds. 



These exposures are similar to those of the same formations on Dog and Birch creeks, 

 and frequent faulting exposes here and there the underlying Eagle sandstones and Benton 

 .shales. 



