insroh'icAL ci'.oLocy ii«» 



that fell near 1 lolhi'ook, Ai-i/ona, in \\)\'l. 'TIk'sc have hccii ai i ;iii;i((| 

 in II case by tluMiisclvcs. 



The wlioh' mass of \'sh'la. a newly (hseoxcred " 191 1" iioii nieteorile, 

 \v(M«>;hin«>; iilO ])()un(ls iVoin near the aiieieiU village of Wleta, New Mexico. 

 A series of polished and lar^(^ etched slic(\s of iron meteorites, iiiclud- 

 iiijj; ail eiitir(> s(>ction of the new Ml. T^dith, AustraHa, mass, showin<; tin; 

 W'idmaustattcu lines in <»;reat perfection, and poHsh(Ml slabs from several 

 lari2;(> stones meteorit(*s. These* are in a case by themselves which like- 

 wise contains s(n-eral c()mi)aratively lar<»;e entire sin«2;le masses of sonu; 

 famous falls. 



An exhibit of nu^teoritic masses, decom])()sition })roducts,an(l country 

 rock showin<i; unaltenHl nuiterial and that which was melted and other- 

 wise alt(M'(Ml by the im])act of the Canyon Diablo meteorite at the spot 

 now known as Meteor Crater, Arizona. This exhibit has been h)aned to 

 the Museum by Princeton University. 



In the desk cases down the center of the hall are the types and 

 figured specimens used by James Hall, R. P. Whitfield 

 and others in the original description and naming of 

 species, or in their further elucidation. 



The specimens in the cases on the left or west side of the hall are being 

 arranged to illustrate stratigraphic geology, beginning at 

 Stratigraphic ^j^^ south (entrance) with the Archean rocks, which are 

 G oloffv ^^^^ lowest and oldest of all and contain no fossils, advanc- 



ing regularly through the Cambrian, Ordovician, Silurian, 

 Devonian, Carboniferous, Jurassic, Triassic, Cretaceous and Tertiary. 

 Most of the specimens on exhibition are from American localities and 

 the species are arranged according to their position in the scale of life, 

 the lower, or simpler forms being placed first. The specimens show^n 

 are those particularly characteristic of the various horizons, the object 

 being to give an idea of the general character of the life of different 

 periods of the world's history. The ends of the cases contain large or 

 striking fossils. 



The specimens on the east, or right, side are being arranged to 



illustrate biologic geology, the classification and relation- 



10 ogic ships of the plants and animals of past geologic times. 



The series starts with the plants and is follow^ed by the 



various sub-divisions of the animal kingdom, again beginning with the 



lower, or simpler forms and continuing to the highest. 



In the first alcove on the right is the stump and part of the roots of 

 a large tree from an anthracite coal mine under Scranton, 

 Pa. Millions of years ago, in the geological period known 

 as the Carboniferous, this tree grew upon the top of a 



