1928
1999
Side by side comparison
Map
Data Sheet
JACOB'S MONUMENT
General Description: This southwest view is in upper Copper Canyon on the
Navajo Indian Reservation.
Soils: Moenkopie soils are found at this site. These red gravelly to fine
sandy loams are shallow with moderately high permeability and low water
supplying capabilities.
Precipitation: Average annual precipitation in upper Copper Canyon ranges
from 6 to 8 inches.
Legal Description: NW1/4SE1/4 Section 27 T.42S., R.13E.
COMPARISON: Few, if any, vegetation changes have occurred at this
location in the 71 years between photographs. However, some sheet erosion seems
to have taken place when comparing soil depths relative to some of the same
rocks visible in both photographs. Low soil capabilities and low precipitation
levels at this site combine to make a harsh medium for plant establishment and
growth. The site seems to be in a stable state where few or very slow
improvements could be expected. Plant species found here include blackbrush,
shadscale, Mormon tea, snakeweed, cliffrose, wolfberry, curlygrass, blue grama,
cheatgrass and red brome.
Original:
Date: 1928 (- A)
Photographer: A.A. Baker
Source: U.S. Geological Survey
Photograph Number: Baker No. 368
Retake:
Date: June 30, 1999 (- B)
Photographer: Earl Hindley
Source: San Juan County
