. . .. . . . 
eoui itry of the world* p r ~ iml of his 
a© a .to reach the mmmit In 
a^4Cltv©ry other ascent sad# during the Colorado work* 
/’’/( la 18 fS the Survey again visited the Yellowstone region 
cA^H &4 
and Professor Holmes* yj*«£c extended over a large part ©£ the Bark* 
LAA.^^'K.-f, -^-VW \ 
his studies cf the Brand Catron being of very especial interest* 
A/a 
It wus determined that great flows of lava, probably in glacial time©* 
Vggu 
had A f tiled the narrow gorge of the river* which normally flowed to 
the forth* turning it temporarily oof of its course 
The glacial ioe sweeping down from the Berth had scattered granite 
masses* derived from the Iforthern highlands over the plateaus to 
*t lAjr *,'£*■*, * ^iuX.s-> ... ./'V 
the South* story* fhis Interpretation was 
verified fifty years later (1988) by the researches of Professor 
R# M* Field* Chief of the Department of Geology, Princeton Univer- 
sity* and Professor 0* 5?* Jones, Head of the Department of Geology, 
University of Manchester* Ingland* who spent the summer in the 
Grand Canyon region* 
It happened in 1874 and 1875 that Professor Holmes* 
geological activities brought him Into contact with the interest- 
ing archeological remains of Colorado* Studies were made of 
the Cliff dwellings and the associated art remains* and later 
corresponding researches were carried over many of the states and 
the Field Columbian. Museum on his studies in connect ion with the 
iQ ({Kt*Z+*' 
A* f* Armour expedition :1m 189b threw much new light upon the 
territories extending frm the Atlantic to 1 
Jersey on the Saat to California on the West 
