2 BULLETIN 89, UNITED STATES NATIONAL MUSEUM. 



specimens iii the collection have been prepared and are now available to the student 

 and for exhibition purposes. 



The greater part of the early work in the preparation of these fossils was done 

 by Mr. N. H. Boss and myself, but that of later years has been carried on by Messrs. 

 N. H. Boss, C. V. Bressler, and G. B. Giles, and I can not too highly commend the 

 dihgence, patience, and skill employed by them in extracting these fossils, often of 

 a deUcate nature, from a most refractory matrix. 



Many of the wash drawings which are reproduced here through the courtesy 

 of the United States Geological Survey were made by the late Mr. Frederick Berger 

 and were prepared under the direction of the late Prof. O. C. Marsh. The later 

 drawings are nearly all the work of Mr. Rudolph Weber. The photographs were 

 made by Mr. T. W. Smillie, of the United States National Museum. 



OCCURRENCE AND HISTORY. 



The extensive collection of Stegosaurian remains in the National Museum has, 

 with few exceptions, been obtained from two important, though widely separated, 

 fossil deposits. These are Quarry 13, located in Albany County, Wyoming, and 

 Quarry No. 1, in Fremont County, Colorado. The former, I may say without fear 

 of contradiction, was the source of the greatest accumulation of Stegosaurian 

 remains ever discovered, and from the latter has been obtained the wonderfully 

 complete skeleton of Stegosaurus stenops (No. 4934, United States National Museum), 

 in addition to many other valuable specimens. 



-Although the history of these quarries has been given in previous articles, it 

 is thought advisable to append a brief review of their discovery, location, and the 

 methods employed in working them, in order to complete the present record. 



HiSTOKY OF Quarry 13. 



With the specimens upon which a portion of the present paper is based were 

 many of the original field labels, on which the locality is given as "Quarry No. 13, 

 8 miles east of Como, Wyoming." Como was formerly a station on the Union 

 Pacific Railroad, situated at the foot of the historic Como Bluflf, but this section of 

 the track was abandoned in 1898, and the station has long since ceased to exist. 



In response to an inquiry made of Mr. W. H. Reed, of Laramie, Wyoming (the 

 original discoverer), as to the history of the discovery of this deposit of fossils, he 

 writes: 



In August, 1879, I could see the end of Quarry No. 10, where the type of Brontosaurus excelsus 

 Marsh was found, so I took one of my men, Mr. E. (i. Ashley, and we started out east ft'om the main 

 bluff (or Como-bluff). On the foiu-th day of our search, in the afternoon, being in the lowest of the Jura 

 bone horizon, we found some hollow bones in the wash and soon after discovered the quarry. The first 

 bones to be taken up was a nearly comjilete skeleton of Allosaurus. After this skeleton had been taken 

 out, we found large quantities of Stegosaurus and Camptosaiirus boaes. This quarry was entirely differ- 

 ent from any other Jurassic quarry I have ever seen, the matrix being a fine quality of sand. * * * 

 There were also numerous small tubes with an outer crust of calcite. These were nearly uniform in 

 size and about one-half inch in diameter. There were no large dinosam- bones found in this quarry, 

 but it seemed to be a favorite resort for the smaller species. * * * The quarry was cut through by 

 two gulches, and that portion on the west side of the west gulch was called 13 west, tliat part between 

 the gulches was 13 east, and that on the east side of the east gulch was 13J. This is as I started the 

 work, and I believe Brown cootinued this plan. * * * i find in my old notebooks the original 

 locations that were filed in 1879 in order, to hold it fi-om trespassers. 



