CERATOPSIA LOCALITIES. 181 



concretion of calcareous sandstone which had weathered out of a thick stratum of soft and 

 almost white sandstone. It was at a slightly lower level than T. serratus. The skeleton a 

 referred to T. prorsus probably comes from nearly the same horizon as the type. 



The type of Triceratops serratus lay about 20 feet above the bottom of the same side of 

 the draw at the point marked + 4, PI. LI. This skull was in the usual calcareous concretion 

 at the base of a stratum of sandstone. The horizon was slightly above that of T. prorsus and 

 considerably above the type of T. horridus. 



Triceratops sulcatus, type, was discovered at the point marked +5, on the divide between 

 Dry Creek and Lance Creek. Its horizon was a little above that of T. serratus, but below 

 the level of T. flabellatus. 



The locality of the type of Triceratops obtusus is at +9, PI. LI, about 1 mile east of Lance 

 Creek, near the southern border of the Ceratops beds. The horizon "would be about the 

 middle of the Laramie, as those deposits are represented in this region." This would seem 

 to bring the species below the level of Triceratops horridus, which is about the middle of the 

 upper half, and hence make it the lowermost species thus far recorded. 



Triceratops elatus, type, was found at the point marked + 16 on the map (PL LI). It lay 

 in loose arenaceous shale a quarter of a mile east of Lance Creek and opposite the mouth of 

 Lightning Creek. The horizon given is about the middle of the Laramie series, which would 

 bring T. elatus and T. obtusus at about the same level, though, as Hatcher says, owing to the 

 absence of exposures of overlying or underlying deposits in this immediate vicinity it is difficult 

 to determine exact horizons with even moderate precision, and this difficulty is augmented by 

 the frequency with which the sandstones and shales of these deposits replace one another 

 both vertically and laterally, making it extremely difficult to trace any given stratum for 

 any considerable distance. Stanton says the position of T. elatus "would not be more than 

 300 to 400 feet below the highest Ceratopsia remains of this area." 



Triceratops brevicornus , type, was discovered embedded in a hard sandstone concretion 

 in the divide between Lance and Lightning creeks, 3 miles above the mouth and 1\ miles south 

 of Lightning Creek, indicated by + 22, in PI. LI. Stratigraphically it lay near the summit 

 of the Laramie deposits, hence is possibly the highest of the known species. Stanton thinks 

 that "its position can not be very much higher than T. prorsus, serratus, and sulcatus." 



Triceratops calicornis, the remaining Converse County species, was found at +29, PI. LI,, 

 about a mile east of the abandoned U-L ranch, which is at the junction of Dry and Lance 

 Creeks. It was embedded in a stratum of rather hard sandstone. Hatcher gives us no clue 

 as to the horizon of this specimen. Stanton says, "It is apparently from about the same 

 horizon as T. sulcatus." 



Of the genus Diceratops, with its single species liatcheri, the type specimen was found 

 in a hard sandstone concretion about 3 miles southeast of the mouth of Lightning Creek, at 

 the point marked + 25, PI. LI. No statement as to the stratigraphical position is given. From 

 its locality it can not be far from the level of T. flabellatus. 



Of the two species of the genus Torosaurus, one (T latus) was found in an extremely hard 

 bluish-colored calcareous concretion near the- top of the bluff on the north side and about 2 

 miles above the mouth of Lightning Creek. It lay in the bottom and near the extreme head 

 of a small, dry watercourse at the point marked +19, PL LI. From its geographical position 

 Stanton believes T. latus to be the highest Ceratopsia specimen from this region. 



The type of Torosaurus gladius came from a horizon considerably lower (200 feet) than 

 that of the preceding species and lay in a thick bed of shale on the northern slope of the divide 

 between Cow and Lightning creeks at + 19A, PL LI. Hatcher does not give the stratigraphical 

 position of the two Torosaurus species with relation to those of the genus Triceratops. 



a The mounted skeleton, No. 4842, U. S. National Museum. 



