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 13; coarse (2 mm)-to-fine (fine ash) laminated
layer with variations in laminae, cross-bedded down-section. Finely laminated
ash and accretionary lapilli sequence. From the bottom to the top of the
sequence there are four clear fining-upward sequences, with various other
layers between them. The first layer, on the bottom, is large accretionary
lapilli (~6 mm). The rest of the layer is ash, although it varies upward from
coarse to fine. Coarse ash is ~0.5 mm in diameter, and fine ash is ~0.1 mm in
diameter. Ash is angular to sub angular, light grey, and glassy. Photo scale
is 50 microns per pixel.
  Cross beds between Units 13 and 14 are defined by differences in clast size;
there are fine ash layers and non-accretionary lapilli layers with larger
clasts (~8 mm). Ash layers are finely laminated with layers on the order of 2
mm. Clasts are sub-rounded to rounded, and are white or tan and glassy. Cross
beds are about 8 cm thick.

Texture
  Grain morphology and appearance: Dark grey granular-textured accretionary
lapilli in a light grey, glassy, angular to sub-angular ash.
  Grain size and sorting: Well-sorted, fining-upward ash 0.1-0.5 mm in size
supporting ~6 mm diameter accretionary lapilli.
  Grain fabric:  Random orientation.

Sediment structure:  Parallel and cross-bedded lamination.

Color:  Grey with a few light tan/white grains.