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THE SANTA FE ROUTE. 109 
siding, where there is an interesting ‘‘forest,’’ known as the North 
Forest, of considerable extent. The logs are all in beds not far above 
the horizon of the Shinarump conglomerate. 
A short distance west of the main Petrified Forest, at the head of a 
small valley which joins the valley of Little Colorado River at Wood- 
ruff (see sheet 17, p. 112), is a group of prehistoric pueblo ruins which 
have been thought to be of Zufi origin. 
A boring was made in the red shale at Adamana to obtain a water 
supply, but the water, though found with sufficient head to afford a 
flow, was too salty for use. This condition is almost universal in the 
red shale of the Moencopie formation, which was penetrated in the 
boring. 
West of Adamana the railway continues down the valley of the Rio 
Puerco, which widens somewhat because of the softness of the red 
Moencopie shale, in which it is excavated. The conglomerate (Shina- 
rump) which lies next above this shale, caps slopes and buttes some 
distance to the north and south. 
The beds lie almost flat, so that the railway in descending the 
valley crosses successively older and lower beds. 
A short distance beyond milepost 251 the Rio Puerco empties 
into Little Colorado River, which flows from the south but turns 
almost due west after its junction with the Puerco. 
sug From this place the railway continues along the 
a tannectn ghee north bank of the Little Colorado nearly to Winslow. 
The valley is wide and contains extensive flats of 
alluvium, with more or less loose wind-blown sand. In a few places 
there are ranches where the river water is utilized for irrigation. 
Holbrook is sustained largely by scattered ranches in the sur- 
rounding country. One of the principal industries of the region is 
Holbrook the raising of stock, sheep, and goats, and it is reported 
ue . tna 200,000 pounds of wool were shipped from Hol- 
Population 60* brook in 1914. There is considerable trade with the 
Kansas City 1,174miles. Indians here, for the Navajo Indian Reservation is 
only a few miles northeast and the Hopi country 
begins not far to the northwest. Holbrook is also an outlet for 
considerable travel coming down the valley of the Little Colorado 
from St. John and other places farther south. 
Holbrook is situated on the red shales and sandstones of the Moen- 
copie formation. The beds dip very gently to the north, and within 
a few miles in that direction the red rocks pass under the Shinarump 
conglomerate, the outcrop of which is marked by low cliffs and 
numerous buttes. The red rocks of the Moencopie formation are 
prominent all along the- valley from Holbrook to Winslow, crop- 
ping out in many low cliffs and mesas. A few miles north of the 
97579°—Bull. 613—15——-8 - 
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