RESUM* AND FIELD NOTES. 
153 
19 Decembre.—Du No. 26' au No. 27'.—On 
fait 4 milles \ sur le gres rouge et l’argile 
rouge ; le gres derriere et formant des petites 
buttes a cliffs perpendiculaires. Presque pas 
de diluvium. 
20 Decembre.—Du No. 27' au No. 28'.—On 
fait 3 milles | en retrogradant sur la riviere, 
pour avoir du meilleur four rage. Neio Red 
avec diluvium tres-petit. 
22 Decembre.—Du No. 28' au No. 29'.—On 
fait 11 miles | a l’ouest, en quittant la riviere 
et en se dirigeant au pied sud du grand volcan 
eteint de San Francisco mountain. Jusqu’a 
deux miles \ du camp on a le New Red sand¬ 
stone sub-schisteux, avec ripple-marks et argile 
rouge. Puis on a au-dessous un calcaire mag- 
nesien oil dolomitique epais a stratification re- 
guliere de | a un pied d’epaisseur, plongeant 
au nord sous un angle de 10 a 15°, en stratifi¬ 
cations concordante avec le New Red , et quel- 
ques assises du magnesian limestone alternant 
avec le gres rouge a la base. Dans ce mag¬ 
nesian on a une couche avec fossiles tres-mal 
conserves ; je crois reconnaitre des fragments 
de Belemnite ? un Nautilus ? un Pteroceras ? 
Quatre milles apres avoir marche sur ce mag¬ 
nesian on a la lave du volcan qui la recouvre ; 
et nons campons sur la base, non loin des cones 
secondaires du grand volcan. Pas de dilu¬ 
vium. Des cendres noires du volcan jusque 
pres du Camp No. 28'. 
23 Decembre.—Du No. 29' au No. 30'.—Cen¬ 
dres volcaniques, laves et dykes de basalte ; 
avec cones volcaniques ; pas d’erratiques ; 13 
milles. 
26 Decembre.—Du No. 30' au No. 31'.—On 
fait 12 milles, tout le temps sur les cendres et 
los laves volcaniques. Pres du camp on a une 
grande montagne de roche sienitique rouge. 
Pas de diluvium. 
27 Decembre.—Du No. 31' au No. 32'.—Vol- 
canique avec rocbe dioritique. Lave rougea- 
tre- La neige couvre les rocbes presque par- 
tout. Nous campons Leroux’s spring. 
31 Decembre. — Du No. 32' au No. 33'.— 
20 t 
December 19.— From Camp No. 85 to Camp 
No. 86, (4| miles.) —We travelled upon the 
red sandstone and red clays ; the red sandstone 
behind, and forming little buttes with per¬ 
pendicular cliffs. Little or no diluvium. 
December 20.— From Camp No. 86 to Camp 
No. 87, (3^ miles.) —We returned along the 
river to-day for 3| miles in order to obtain bet¬ 
ter forage for the animals. New Red, with di¬ 
luvium very slight. 
December 22.— From Camp No. 87 to Camp 
No. 88, (11^ miles.) —We passed westward, 
leaving the river and going towards the south¬ 
ern base of the extinct volcano of San Fran¬ 
cisco mountain. Two and a half miles from 
camp we found the New Red sandstones, sub- 
schistose with ripple-marks, and red clay; 
under this a magnesian limestone, or thick 
dolomite, regularly stratified, in beds of six 
inches to one foot in thickness, dipping to the 
north at an angle of from ten to fifteen de¬ 
grees, in concordant stratification with the 
New Red. Some strata, also, of magnesian 
limestone, alternating with the red sandstone 
at the base. In that magnesian formation we 
found a bed of fossils, but very badly pre¬ 
served. I believe that I recognised fragments 
of Belemnites ? a Nautilus f and a Pteroceras f 
After having travelled four miles on this mag¬ 
nesian formation, we reached the lava of the 
volcano which covers it from view. We 
camped upon this lava, not far from the sec¬ 
ondary cones of the great volcano. The over¬ 
flows from the volcano are black, and reach 
nearly to Camp No. 87. No diluvium. 
December 23. —From Camp No. 88 to Camp 
No. 89, (13 miles.) —Volcanic ashes, lavas, and 
basaltic dykes with volcanic cones were passed. 
No erratics. 
December 26.— From Camp No. 89 to Camp 
No. 90, (12 miles.) —We were all of the way 
upon volcanic ashes and lavas. We found 
near the camp a great mountain of red sienitic 
rock. No diluvium. 
December 27.— From Camp No. 90 to Camp 
No. 91.—We passed volcanic and dioritic rocks 
and reddish lava. The rocks are almost all 
covered by snow. Encampment at Leroux’s 
spring. 
December 31.— From Camp No. 91 to Camp 
