382 The American Geologist. june, isos 
measurement with an aneroid barometer we found the hight of the 
summit to be G20 feet above the base and 4720 feet above the sea 
level; while Mareou's Mont Revuelto, the most prominent peak, 
is 4520 above the sea level, making the hill I call Big Tucumcari 
200 feet higher than all other peaks in that vicinit}'. This accounts 
for the fact that the one called Cerro de Tucumcari comes into 
sight before the others from different directions. 
Fourth. — The situation the two hills occup}- as to the old road. 
Simpson put it on the north side of the road. In the quotation 
from his journal he says: ''To the south some eight miles distant, 
I could see with m}' reconnoitering glass the serrated tents of our 
little command, quietly reposing on a timbered affluent of the 
Canadian. " 
It will be seen b}* reference to the map that the Big Tucumcari 
of Marcou is on the south side of the old road, the road passing 
ver}' near to its northern base. 
Fifth. — From the position Cerro de Tucumcari occupies with 
reference to the other hills in the vicinity. 
The Cerro de Tucumcari of Lieut. Simpson is the most north- 
ern hill in the vicinit}-. He sa^'s: "To the northeast and north 
lay a limitless extent of broken undulating prairie;" and again, 
"To the west and south lay a confused mass of irregular hills." 
Sixth. — From the area of the base. The hill called Big Tu- 
cumcari by Marcou is irregular in outline, and the side on the 
north next to the road is nearly four miles in extent and is not 
less than ten miles in circumference. 
Lieut. Simpson saj's of Cerro de Tucumcari: "The circumfer- 
ence of its base to our surprise I found to be nearly six miles, it 
having taken a horse two hours, less eight minutes, to walk 
around it." 
Seventh. — From the size of the area of the summit. On the 
top of Prof. Mareou's Big Tucumcari there is not less than two 
square miles. 
Lieut. Simpson sa3's of the one he called Cerro de Tucumcari : 
"Pacing the top of the mound I found it to be 230 yards by 370 
in area. ' We found it to be about the area given by Lieut. Simp- 
son. 
Eighth. — From the difference in position of Cerro de Tucum- 
cari of Simpson and Big Tucumcari of Prof. Marcou as to the 
Llano Estacado. The hill called Big Tucumcari b}' Prof. Marcou 
