PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

OBJECT                = TEXT
  PUBLICATION_DATE    = 2009-11-15
  NOTE                = "Sample context description"
END_OBJECT            = TEXT
END

Keanakakoi outcrop within a sandy wash, Kau Desert. Thick pile of
horizontally-bedded fall/surge deposits with glassy clasts and lithics (5-10%)
which implies more energetic eruption than nearby Puu Oo. Deposit is phreatic.
Water content suggests a partial quenching which incorporated a ground water
pool. Surfaces get exposed to mist and then form opal (SO2 forms sulfuric acid
which drives Si dissolution from the basalt. This reprecipitates when water
evaporates leaving an opal surface coating). Trace jarosite has been found by
geochemistry.

Ash layers are finely laminated and show contrasts in color and resistance to
weathering. Some layers do not have a consistent width, causing overlying
layers to drape over them. Cross-beds at the top of the column. Layers are
composed of poorly-sorted ash that includes clasts on the order of 1 cm. Finer
layers are more resistant to erosion and are less than 5 mm thick. Beds range
from grey to dun; grey beds have a finer ash matrix than the dun beds, which
are clumpy.