POTASH SALTS AND OTHEE SALINES IN THE GREAT BASIN REGION. 89 
Table XXX. — Petrographic examination of samples from Searles deep well. 
[Analyses by J. C. Jones.] 
No. 
Description. 
209 
211 
212 
213 
214 
215 
216 
217 
2 IS 
222 
223 
224 
225 
226 
227 
229 
Similar to 221 and 213. 
Fine-grained tourmaline, biotite, hornblende, plagioclase, and quartz grains recognized. Major part 
of material clay cemented by gaylussite. 
Larger grains pirssonite. limonite. a few quartz grains. 
A fine mud cemented by carbonates with a few fragments of quartz, hornblende, tourmaline, and 
iron oxide. 
Crystals of pirssonite with inclusions of clay and iron oxide. 
Mostly crystals of pirssonite. some halite, grains of quartz, clay, and iron oxides. 
Pirssonite in broken crystals, limonite, kaolin, biotite, tourmaline, quartz. Fine-grained material 
average diameter, 0.5 mm. 
Crystals of pirssonite. nodules of limonite, a few grains of quartz, hornblende, plagioclase. 
Mostly clay and iron oxide cemented by carbonates; some grains of quartz, hornblende, biotite, and 
a few clouded and decomposed orthoelase crystals noted. 
Mostly clay cemented by pirssonite; mineral fragments of quartz, hornblende, tourmaline, biotite, 
apatite, and many fresh and clouded fragments of microcline, approximately about 25 per cent of 
the mineral fragments left after washing out clay and dissolving carbonates. This is the only 
sample in which feldspar crystals approaching freshness were noted. 
A fine mud firmly cemented by carbonates with a few fragments of quartz, hornblende, and hydrated 
biotite. 
Oolitic sand; rounded grains composed of minute grains of quartz cemented in part by carbonates 
and iron oxide but retaining form after being acted on by acid. Not a true oolite as ho concentric 
structure could be noted. 
Fine-grained clay grains of quartz, hornblende, biotite, cemented by carbonates. 
Similar to No. 223. 
Fine-grained clay, cemented by carbonates, grains of tourmaline, quartz, hornblende, apatite, and 
biotite. • 
Similar to No. 223. 
Grains about 1 millimeter in diameter, gavlussite, limonite, quartz. 
Similar to No. 225. 
