In the west half of the hall fifteen cases are filled with 
marbles and other ornamental stones from many parts of 
the world. The specimens are large enough to display to 
advantage the characteristic patterns of each variety. Build- 
ing stones in the form of four inch cubes fill five cases. Col- 
lections of various industrially important non-metallic min- 
erals, which occupy the rest of the hall, include barite, fluor- 
ite, asbestos, mica, phosphates, grinding and polishing mater- 
ials, gypsum and borax. At the end of the hall are soda 
and potash collections, which include a large group of the 
Stassfurt potash salts. 
Hall 38: Historical Geology. — The collections illustrate 
historical geology and paleontology, and are so arranged 
that, beginning at the south end of the hall, the forms of 
life which have characterized successive stages of the earth^s 
history are illustrated in order from the earliest up to recent 
times. Thus the fossils which represent the life forms of 
each geological period may be found in the portion of the 
hall corresponding in position to that period in time. Begin- 
ning with two introductory cases, one, illustrating methods 
of fossilization, and the other, comparisons of ancient and 
modem plants and animals, the fossils of the Age of Inverte- 
brates, Age of Fishes, Age of Reptiles, Age of Mammals 
and Age of Man are shown successively. Especially note- 
worthy exhibits include part of a skeleton of the huge dino- 
saur, Apatosaurus, from Colorado, a very large skull of the 
homed dinosaur, Triceratops, a mounted skeleton of the 
extinct ungulate. Allops, shown partially imbedded, complete 
skeletons of the Mastodon, Mammoth, Cave Bear and Irish 
Deer, and several skeletons or parts of skeletons from the 
asphalt beds of Los Angeles, California. 
DEPARTMENT OF ZOOLOGY 
Halls 13, 15-22, First Floor 
Hall 13: George M. Pullman Hall. Horned and Hoofed 
Mammals. — This hall, running north and south and imme- 
diately west of Stanley Field Hall, is devoted to horned and 
hoofed mammals — game animals from all parts of the world. 
In the north end is a large habitat group of Alaska Moose, 
and thence southward are various representatives of the deer 
family, the antelopes, gazelles, wild sheep, goats, and oxen, 
terminating at the south end of the hall with the Bison and 
Musk Ox. 
Hall 15: Mammals-Systematic. — This hall is at the right 
of the main north entrance to the Museum, and is entered 
17 
