John traded for some green corn and melons and a sheep. Here 
the women brought in some goatfe milk which was good. 
August 13th.- 
I climbed the trachyte mesa that projects from the West end 
of the Gariso Mts. At a distance I was puzzled to know what 
the white patches were in the faces of the cliffs. I could 
distinctly see that the jurassie. sandstones jutted up against, 
A 
or were dove-tailed into the border faces of the trachyte, also 
that the flat tracb&ic mass of the mesas seemed to be a~~slbpe 
( 
of portions of the sedimentary 
and that beneath this 
f 
again was the main masses of 
beds - so: 
the trachyte (a). 
Pound the white patches to be a softer tr-achyte( ?) from which 
it appeared dark hard shell had been partially broken away. 
The dark part weathers into somewhat columnar form. The \light 
into dome shapes. The rock does not seem to be essentially 
different only the outside and darker part is harder. (Brought 
specimens of each). Found fragments of cretaceous fossils and 
shale of Nos. 2 and 3 scattered about over the volcanic area - 
although every fragment of cretaceous rock seems to have been 
eroded away about the North and West bases of the group. 
If a theory were called for to account for the conditions of 
things in these Mts.; I should say that in the first place 
