PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

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

High-level Description: Layered surge deposits, alternating coarse to
fine-grained; layers are mm- to 10s of cm-scale in thickness. Whitish opaline
deposits exist as surface coatings in damp areas.

Texture
  Grain morphology and appearance: Angular to very-angular sub-vitreous to
vitreous coarse ash in a clast-supported matrix. Fine layers (3746) alternate
with coarse layers (3747). Fine layer is clumpy, dun ash with larger,
sub-angular black clasts (0.7 mm). Tan clasts are about 0.1 mm and sub-round
to round and vitreous; grain surfaces are smooth. Ash clumps are a little
larger than black clasts and are irregularly shaped. Coarse ash layer is
comprised of black and tan sub-angular particles. Vitreous opal coating up to
5 cm thick, evident as whitish-grey, nodular or crystallized granular-textured
surface deposits (3748, 3749) on tan, 1 mm diameter sub-angular clasts.
  Grain size and sorting:  Coarse ash 0.1-1 mm in diameter. Darker grains are
approximately 1-2 mm in diameter. A few large (about 1 cm), grey, sub-round
pumice clasts with ellipsoid vesicles about 0.3 mm are evident. Individual
coating crystals can be up to 0.3 mm diameter. No sorting.
  Grain fabric:  Random orientation.

Sediment structure:  Parallel lamination. There is no visible layering or
textural differences visible at this scale.

Color:  Brown/tan glassy grains mixed with dark grains (10%). White vitreous
opal coating.