PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM

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

High-level Description: Unit 3, a sequence of 3 coarse-to-fine-grained layers,
each ~3 cm thick. The images cover one coarse (3709) and one fine-grained
(3710) pair.
  The lower coarse-grained layer is comprised of poorly-sorted accretionary
(20%) and non-accretionary lapilli. Grain size ranges from ~1 cm (40%) to ~2-3
mm (60%). Accretionary lapilli are sub-rounded and sub-spherical, with a
gritty surface. Non-accretionary lapilli are sub-angular, rough, black scoria
with many vesicles (~1 mm diameter). About 30% of non-accretionary lapilli are
white, smooth, and sub-rounded. There is higher ash content in this layer
(visible as a light-grey matrix) than Units 1 and 2, but no distinct layering.
  The upper finer-grained layer is well-sorted accretionary and
non-accretionary lapilli. Most are ~1-2 mm with a few larger clasts (~4 mm).
Accretionary lapilli (40%) are light grey and gritty-textured, with fairly
indistinct edges which blend into the ashy matrix. Non-accretionary lapilli
(80% of lapilli) are mostly sub-round vesicular scoria, which are similar in
color to the accretionary lapilli and the ash. No distinct layers, but large
amounts of ash composing the matrix.

Texture
  Grain morphology and appearance: Gritty-textured sub-angular to sub-rounded
grains mixed with sub-spherical accretionary lapilli in a clast-supported
matrix.
  Grain size and sorting: Poorly-sorted clasts 1-10 mm diameter
  Grain fabric:  Random orientation.

Sediment structure:  None evident.

Color:  Black to grey with a few white grains.